Power Supply Design

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POWER SUPPLIES ANALOG                                                                          DESIGN GUIDE                                                      4
Data Sheets                                                 Applications Notes                                                     Free Samples                     N
                                                 •                                                                   •                                          ITIO
                                                                                                                                                         22nd ED
Smallest Dual-Output Supply
for PDAs: Logic Step-Down and
LCD Step-Up
High-Efficiency Hand-Held Supply Fits Internal Switches into a
12-Pin QFN Package

                                                     STEPS DOWN TO 1.25V FOR NEWEST LOGIC CHIPS
                                                                             10µH
                               INPUT
                            2.0V TO 5.5V
                                                                                                                            LCD OUTPUT
                                                                    IN              LXLCD                                    UP TO 28V
                                                                                                                            UP TO 10mA
                                                                                                                         0.1µF
                                      IN QFN                                        FBLCD
                                   2-P                              AIN1
                              1




                                               mm




                                                                    AIN2
                             4mm




                                            85




                               x
                                   4m m x   0.


                                                                           MAX1878
                                                       ON                                           10µH                  LOGIC OUTPUT
                                         LOGIC                                          LX
                                                                    ON                                                     1.25V TO VIN
                                            OFF
                                                                                                                           UP TO 500mA
                                                       ON
                                            LCD
                                                                    ONLCD               FB
                                              OFF
                                                                    PGND AGND PGNDLCD




     Packaged in a 0.85mm high, 4mm x 4mm QFN, the MAX1878 is the
simplest and smallest single-chip solution providing both logic and LCD
power for PDAs and hand-held products. For the logic supply, it uses a                                                                     ANALOG
high-efficiency (90%) step-down DC-DC converter with synchronous rectifi-                                                                  DESIGN GUIDE
cation that eliminates the need for an external diode, saving cost and size.                                                               1    Multiplexers, Switches
For the LCD supply, the internal switch is capable of supplying outputs as                                                                 2    Interface Products
high as 28V. Each output has its own logic-controlled enable.                                                                              3    Op Amps, Comparators
                                                                                                                                                DC-DC Converters,
• Dual-Output:                                                                       • 90% Efficiency                                      4    Power Supplies
  • Step-Down: Logic Supply Down                                                     • Low 19µA Quiescent                                   5   µP Supervisory
    to 1.25V                                                                           Supply Current                                       6   Analog Filters
  • Step-Up: LCD Supply Up to 28V                                                                                                           7   A/D Converters
                                                                                     • Evaluation Kit                                       8   Video/High-Speed Amps
• Smallest Package: 4mm x 4mm                                                          Available to Speed                                   9   D/A Converters
  12-Pin QFN                                                                           Designs                                             10   Analog Functions
• Small External Components:                                                         • Priced at $1.57†                                    11   Voltage References
  10µF and 10µH                                                                                                                            12   Temperature Sensors
                                                                                                                                                High-Speed
†1000-up recommended resale. Price provided is for design guidance and is FOB USA. International prices will differ due to local duties,
                                                                                                                                           13   ADCs & DACs
taxes, and exchange rates. Not all packages are offered in 1k increments, and some may require minimum order quantities.
                                                                                                                                           14   Signal Conditioners
              is a registered trademark of Maxim Integrated Products, Inc. © 2002 Maxim Integrated Products.
Smallest, Highest Efficiency
Multi-Output DC-DC Converter
Compact, Cost-Effective, Integrated Power Supply Solutions for
Digital Cameras and PDAs
    Use the MAX1800 step-up master or the MAX1802 step-down master to provide all the voltage
outputs required in your digital camera and PDA designs from a single IC. They include high-effi-
ciency DC-DC converters with synchronous rectifiers to give over 90% efficient power conversion for
the logic supply, which uses >50% of the power in a camera system. They come in a small 32-pin
5mm x 5mm TQFP, which is 40% smaller than existing TQFP solutions. The MAX1800 and MAX1802
also eliminate external components such as power diodes, power switches, and at least one
transformer to save cost and size. For flexibility, add the low-cost, 8-pin SOT23 MAX1801 “slave”
controller to create optional features like a motor control supply for zooming and focusing. The
MAX1800/MAX1802 can provide all the voltages for logic, core, backlighting, LCD, and expansion
port of PDAs.


                                       EXAMPLE OF A COMPLETE DIGITAL CAMERA POWER SUPPLY
                                                   (CAN ALSO BE USED IN PDAs)
                                                        INPUT
                                                     0.7V TO 5.5V                                                                            EIGHT OUTPUTS
                                                                                                   P OUT1
                                                                                                                                             3.3V    LOGIC
                                                                                               N
                                                                                                              P
                                                                                                                                             1.8V    CORE
                                                                                                     LDO
                                                                                                            VIN



                                                                                                                                             7.0V    CCFL MODULE
                                                                                                     OUT2     N


                                                                                                            VIN
                                                                                        MAX1800                                              15.0V
                                                                                        STEP-UP                                                      CCD BIAS
                                                                                        MASTER                                               -7.5V
      MAX1800 STEP-UP MASTER                                                                         OUT3     N
     MAX1802 STEP-DOWN MASTER                MAX1801 SLAVE CONTROLLER
                                                    8-PIN SOT23                                             VIN
             32-PIN TQFP—5x5*                                                                                                                18.0V
             7mm x 7mm x 1mm
                                                   2.8mm x 2.9mm                                                                                   LCD BIAS
                                                                                                                                             12.0V
         (DIMENSION INCLUDES LEADS)
                                                                                                                                       VIN
                                                                                                     OUT4     N
                                                                                                                                                     ZOOM
                                                                                   OUT1 ON
                                                                                                                   MAX1801                   5.0V    MOTOR DRIVE
                                                                 ON
                                                                       OFF
                                                                                   OUT2 ON
                                                                                   OUT3 ON           OSC          OSC SLAVE
                                                                                                                                  DL     N           (OPTIONAL)
                                                                                                                     CONTROLLER
          1-, 2-, 3-, or 4-Cell Designs                                            OUT4 ON
                                                                                   LDO ON             REF         REF                              ADD UP
          MAX1800                          MAX1802                                                                                              TO FIVE SLAVE
                                                                                             GND
                                                                                                                                       VIN
                                                                                                                                                CONTROLLERS
 Step-Up,
                                 Step-Down
 Step-Up/Down                                                                                                      MAX1801                   5.0V    LENS COVER
 0.7V to 5.5V Input              2.5V to 11V Input                                                                OSC SLAVE
                                                                                                                                  DL     N           DRIVE
                                                                                                                     CONTROLLER                      (OPTIONAL)
                                                                                                                  REF
 One Li+,                        Two Li+,
 Two or Three Alkaline           Four Alkaline
 Internal Step-Up,               Step-Down Controller,
 Three Step-Up Controllers,      Three Step-Up Controllers,
 LDO Controller                  Internal Step-Down



*Dimensions include 5mm body plus 1mm for the length of each lead for a total of 7mm.
Lowest Cost Three- and Five-Output
xDSL and Cable Modem Power Supplies
High-Efficiency Step-Down Controller Plus Multiple LDO Controllers
on a Single IC

                                          COMPLETE, LOW-COST, FIVE-OUTPUT xDSL MODEM SUPPLY

• No Current-Sense
  Resistors Mean
                                    INPUT
  Less Cost                       LOW-COST                                              FIVE OUTPUTS
• Step-Down Output:                ADAPTER              V+
                                                                        DH   N
                                 4.5V TO 28V                                            3.3V
  1.25V to 5.5V                                                                         1A     I/O
                                                                        DL   N
                                              Q
• LDO Outputs:                            -PIN S                                        2.5V
                                                                                        500mA CORE
                                                   OP
                                     16




  ±1.25V to ±15V
                                            1864




                                                                     LDO1
                                                                                        5V
                                                   m
                                     6m




• Power-OK Checks All                    m x .9 m
                                            4                MAX1865T                   100mA AFE
  Outputs                                                            LDO2
                                              Q                                         12V   POSITIVE
• EV Kit Available to                     -PIN S                                        100mA LINE DRIVER
                                                   OP
                                     20

                                            1865




  Speed Designs                                                      LDO3
                                                                                        -12V  NEGATIVE
                                    6m




                                                   m




                                      m                                                 100mA LINE DRIVER
                                                   m




                                          x 8.65
                                                                     LDO4
                                                                     POK     POWER OK
                                                               GND           SIGNAL




     Use the MAX1864 and MAX1865 power-supply controller ICs to build the lowest cost xDSL and
cable modem consumer premises equipment (CPE) power supplies. They integrate a high-efficiency
step-down DC-DC controller and two to four linear regulator controllers that provide all the required
voltages for CPE. The current-mode step-down controller uses an external, dual N-channel MOSFET to
provide low-cost synchronous rectification for high efficiency and low heat. To further save cost, no
external current-sense resistor is required. Switching frequencies of 100kHz and 200kHz permit the
use of low-cost magnetics and aluminum electrolytic capacitors. The linear regulator controllers drive
inexpensive external bipolar junction transistors (B JTs).



MAX1864                                                      MAX1865
• Step-Down Controller                                       • Step-Down Controller
• Two Positive LDO Controllers                               • Three Positive LDO Controllers
• 16-Pin QSOP Package                                        • One Negative LDO Controller
                                                             • 20-Pin QSOP Package
110V Power Supply Controller
Integrates High-Voltage Startup FET
• Up to 300kHz Operation for Smaller                              Optimized for Telecom and
  Magnetics and Capacitors                                   Data Communications Applications
• Wide 11V to 110V Input Voltage Range                      VIN (UP TO 110V)

• Guaranteed ±2.5% VREF Accuracy                                                                                                         VOUT
• Only 2.2mA Supply Current                                                                                                               5V
                                                                             V                                    CC
• Input Feed-Forward
  Compensation for Fast Line-                                     V                                     IN

  Transient Response                    -PIN QS                                     N_DRV




                                                                                OP
                                                                      16
• Programmable: Current
                                                                                    CS


                                                                      4.8




                                                                                 m
  Limit, Maximum Duty                 0m




                                                                                m
                                         m x 5.84
  Cycle, Oscillator             43% SMALLER FOOTPRINT                      MAX5003             R                                 SENSE

  Frequency, Undervoltage      THAN COMPETITOR’S SO-14
  Lockout, and Soft-Start                                                  HV PWM
                                                    INTERNAL             CONTROLLER
• External Frequency Synchronization              110V STARTUP
                                                                                          OPTOCOUPLER
                                                                                            FEEDBACK
                                                   TRANSISTOR
• MAX5003 EV Kit Available to Speed                                                         ISOLATION

  Designs




Low-Cost, Dual-Output SLIC Supply
Uses Standard Transformer

                                               STANDARD TRANSFORMER FROM                                     OUTPUT VOLTAGE CAN BE SET
                                                    MULTIPLE VENDORS                                         TO OPTIMIZE SHORT-LOOP OR
                                                      REDUCES COST                                           LONG-LOOP OPERATION WITH
                                                                                                                  VARIOUS SLIC ICs
                                     INPUT                                                    OUTPUT 1
                                   8V TO 24V                                         -72V, 100mA RING BATTERY



                                                          VCC                                 OUTPUT 2
        LOW-COST                                                                     -24V, 400mA TALK BATTERY
       UNREGULATED                                    MAX1856
                                                   SYNC
          AC-DC
                                     SYNC SIGNAL
         ADAPTER                      (OPTIONAL)
                                                   FREQ         EXT         N                      FLYBACK TOPOLOGY REDUCES
                             FREQUENCY
                               SELECT                           GND                                   INPUT RIPPLE CURRENT
          DIGITAL         (100kHz TO 500kHz)
        SOFT-START


    EVALUATION KIT AVAILABLE TO SPEED DESIGNS. The MAX1856 can be configured to work with different input and
    output voltages from those shown in this block diagram. For further information, please contact your local Maxim FAE or email us
    at powerhelp@design.mxim.com.
Industry’s First Hot-Swap Switches
for Power-Over-LAN
Simple-Swappers™ Require No Design and No External Components

                                                     65V SWITCH IS IEEE802.3af COMPATIBLE
                                                                                                                       DATA TERMINAL EQUIPMENT

                                                                                   MAX5910                            • IP Phone
                             BACKPLANE                                             MAX5917
                                                                         VIN                  VOUT                    • Wireless LAN Access Node
                           (+10V TO +65V)                                                                               (Eliminates AC Adapter)
                                                                         UVLO                 GND
                                                                                                                      • Security Camera
                                                                         ENABLE              FAULT                      (Eliminates AC Adapter)
                       SAFELY CONNECT YOUR
                                                                         N.C.                PGOOD
                     DATA TERMINAL EQUIPMENT
                        TO A SWITCH/ROUTER
                          POWER SOURCE.

                                                                     Beats Competition 3 Ways
 1) First IEEE802.3af-Compatible                            2) Highest Integration                                        3) Smallest Board Space and
    Hot-Swap Switch                                                • Internal Switch Delivers 26W                            Lowest Cost
      • Drives 500µF at Startup                                      of Power                                                • Requires No External
      • 500mA Output Current at                                    • Built-In Undervoltage Lockout                             Components
        Startup                                                      (UVLO)                                                  • 60% Less Board Space than
      • Input Voltage Range:                                       • Power Good Output Monitors:                               Discrete Solutions
        +10V to +65V                                                 UVLO, Power Not Good, and                               • 8-Pin or 16-Pin SO Packages
                                                                     Thermal Shutdown


                                              -48V SWITCH DELIVERS POWER AND DATA OVER
                                                     STANDARD CATEGORY 5 CABLE

                     MONITORS UVLO                                                 WITHSTANDS                                  ♦ 2Ω INTERNAL POWER
                    POWER NOT GOOD,                                              -70V TRANSIENTS                                 SWITCH
                    LOAD DISCONNECT                                                                                            ♦ DELIVERS 13W POWER
                  & THERMAL SHUTDOWN                                                                                             (20W FOR MAX5912)
                                                                                                                               ♦ DISCONNECTS LOAD AT
                                                          -16V to -65V     VIN                       GATE
                                                                                                                                 “ZERO CURRENT”
                   COMPATIBLE WITH                            FAULT OUTPUT                           VOUT                      ♦ SAFE HOT SWAP
                   3.3V AND 5V LOGIC                                                 MAX5911/
                                                                      ON/OFF         MAX5912         AGND

                                                                         UVLO         SIMPLE         DGND
                                                                                    SWAPPER™
                    ADJUST DEFAULT
                                                                                                                               CAN VARY ±5V
                   UVLO THRESHOLD
                                                                                                                               WITH RESPECT
                    WITH EXTERNAL
                                                                                                                                  TO AGND
                   RESISTOR DIVIDER


                                                                               Output Current Limit
                                                              Part                                          Pin-Package
                                                                                      (mA)
                                                        MAX5910                        280                     8-SO
                                                        MAX5911                        280                     8-SO
                                                        MAX5912                        415                     16-SO
                                                        MAX5917A                       567                     16-SO
                                                        MAX5917B                       420                     16-SO

Simple-Swapper is a trademark of Maxim Integrated Products, Inc.
Highest Power Step-Up DC-DC
Delivers 20W to Replace Modules
Drop-In, Internal Switch 20W PWM Design in SO Package
                                                                                                          MAX1708
                                                                                                         16-PIN QSOP


                                                                 NETWORK OR TELECOM CARD
                                                                INPUT
                                                              0.7V to 5V        1µH                     5A MOSFET

                                      LOCAL ISOLATED                                                                       MAX1709
                                      3.3V POWER BUS                           MAX1709
                                                                ON                                                 16-PIN NSO       28-PIN QSOP
                                                                         OFF                       OUTPUT
                                                                                                    5V/4A
                                                              600kHz OR                             LOCAL
                                                       SYNCHRONIZABLE                             POWER BUS
              RACK-MOUNTED                              PROGRAMMABLE

           TELECOMMUNICATIONS
                                                         CURRENT LIMIT                                                   9A MOSFET
                                                        AND SOFT-START
                 SYSTEM


     The MAX1708 and MAX1709 set a new standard of space savings for high-power step-up DC-DC
conversion. The MAX1709 packs a 22mΩ, 9A, power MOSFET into a small SO package. It operates
from inputs in the 0.7V to 5V range, and provides up to 20W at fixed (3.3V or 5V) or adjustable (2.5V
to 5.5V) voltages. For lower power applications, choose the MAX1708, which provides up to 10W (5V at
2A) in a smaller 16-pin QSOP package. For added flexibility, both devices include programmable soft-
start and current limit, allowing external components to be optimized when less than full-power
capability is required.


Simplest SOT23 Step-Up Controllers
Use Fewest Components
                                   SIMPLEST AND SMALLEST BOOST CONTROLLER CIRCUIT
                                              ELIMINATES INRUSH CURRENT
           POWER INPUT
                                                                                                                         SOFT-START RESPONSE
            1V TO VOUT
                                                                                                                    VIN = 3V
             VCC INPUT                                                                                              VOUT = 12V
                                     VCC
            2.5V TO 5.5V                                                                                            RLOAD = 200Ω
                                                                                         OUTPUT
                                           MAX1522                                         >VIN                     ILOAD = 60mA
                                           MAX1523                                        UP TO
                                           MAX1524                                         30W     VOUT, 5V/div
                                                     EXT             N

                    ON               SHDN                                                         VSHDN, 5V/div
                             OFF                     FB
                                             GND
                    SO
                 PIN T
                      23
            6-




                                                                                                      IL, 1A/div
                         m
           2.9




             m
                      m




                 m x 2.8                                                                                                           400µs/div

                              Built-in soft-start eliminates inrush current spikes, permitting use of a smaller and lower
                              cost input capacitor and inductor. The costly sense resistor is also eliminated.

    Use the MAX1522/MAX1523/MAX1524 DC-DC controllers to build the simplest and smallest
step-up circuits. These SOT23 controllers have an internal digital soft-start that eliminates the inrush
current spikes that shorten useful battery life. Soft-start also permits a smaller input capacitor. These
controllers eliminate the sense resistor to increase efficiency while saving space and cost. Finally, they
switch at up to 1MHz, permitting the use of a small inductor.
Highest Power, Low-Voltage, Boost
DC-DCs Are Now Smaller
50% Smaller Packages, 0.7V Startup Voltage, Up to 1.5A Output,
1MHz Switching (or Synchronize from 500kHz to 1.25MHz)
    The MAX1760/MAX1763/MAX1765 are 50% smaller upgrades to the popular MAX1700 family of
low-voltage, high-power, high-efficiency PWM step-up DC-DC converters. The MAX1760 family
features smaller external components, adjustable current limit, and soft-start. They deliver more
power from low voltages than any other step-ups available: 1.5A from 3.6VIN (single Li+) and 400mA
from 1.2VIN (single NiMH or alkaline). Input range is 0.7V to 5.5V. Switcher output range is 2.5V to
5.5V. The MAX1763 and MAX1765 include a linear regulator for a second output.

                   SMALLEST PACKAGE                                                                      HIGHEST POWER                                                                                                     STEP-UP/DOWN

        INPUT                                                                            INPUT                                                                                        INPUT
                                                                                                                            INL
                                                                                                                                                                    DUAL OUTPUTS
                                                                                          1 x Li+
         1 x Li+
                                                            LX                              OR                                              LX                      SYSTEM POWER        1 x Li+
                                                                                                                                                                                                                                                                    LX
           OR                                                                                                                                                                          2.5V TO
          2AA
                                         MAX1760                      OUTPUT               2AA                                  MAX1763                             5V OR 3.3V           4.2V
                                                                                                                                                                                                                                                    MAX1765                         OUTPUT
                                                         OUT          UP TO 5.5V                                                   DC/DC OUT                        UP TO 1.5A                                                                                     OUT              3.3V
                                                                      UP TO 500mA                                                                                            CORE POWER                                                                                             UP TO 500mA
                                                                                               ON                          DC/DC                                             3.3V OR 1.5V
                                                                                                               OFF                                                           UP TO 1.5A
            ON                                                                                                                           LDO DR                                                                     ON                         ON
                                     ON                                                                                                      FB
                                               GND                                             ON                          LDO     GND                                                                                                                  GND
                          OFF                                                                                                                                                                                                      OFF
                                                                                                               OFF




                                                IN µMA                                                            IN QSO                                S
                                                                                                                                                    IN T SOP-E                                     1.5W                               IN QSO                                    S
                                                                                                                                                                                                                                                                            IN T SOP-E                     1.5W
                                             0-P                                                               6-P                                -P                                                                               6-P                                    -P
                                                                                                         1




                                                                                                                                                                                                                           1
                                                                                                                        P




                                                                                                                                                                                                                                            P
                                         1



                                                        X




                                                                                                                                                                                                 PACKAGE                                                                                                 PACKAGE
                                                                                                                                             16




                                                                                                                                                                                                                                                                     16
                                                                                                                                                                P




                                                                                                                                                                                                                                                                                       P
                                                                                                                                    OR                                                                                                                      OR
                                                            mm
                                    3mm




                                                                                                                                            5m




                                                                                                                                                                        m
                                                                                                                              m




                                                                                                                                                                                                                                                  m




                                                                                                                                                                                                                                                                                               m
                                                                                                     4.9




                                                                                                                                                                                                                         4.9




                                                                                                                                                                                                                                                                    5m
                                         x
                                                         .1




                                                                                                                                                               1m
                                                                                                                           7m




                                                                                                                                                                                                                                               7m




                                                                                                                                                                                                                                                                                      1m
                                                        1
                                                                                                                                             m




                                             4.9                                                           m                                      x6                .                                                          m




                                                                                                                                                                                                                                                                     m
                                                                                                      m




                                                                                                                                                                                                                          m
                                                                                                               x 6 m m x 1.                                                                                                        x 6 m m x 1.                          x6                .
                                                   mm x                                                                                                .3 m m x 1                                                                                                             .3 m m x 1



                   EVALUATION KIT AVAILABLE TO SPEED DESIGNS. Conceptual schematics; not all components are shown.



Regulated Step-Up/Down Charge
Pump Delivers Guaranteed 125mA
       NO INDUCTOR, ALL CERAMIC CAPACITORS                                                                                                                                                                  STEP-UP/DOWN REGULATION
                                                                    0,22µF

                                                                                                    GEREGELTE AUFWÄRTS-/ABWÄRTS-
                                                              CXN            CXP
                                                                                                     WANDLUNG MIT 1 KONDENSATOR                                                                   Delivers 5V or 3.3V from a 1.8V to 5.5V
           EINGANG                                               MAX1595-33                                                                                                                               Input with No Inductors
             1,8V                                                MAX1595-50                                      AUSGANG
                                                            IN                OUT                              5V ODER 3,3V                                                                       6.0
             BIS
             5,5V                                                                                                 125mA                                                                                                                                     VOUT = 5.0V, ILOAD = 125mA
                                                                                                                                                                                                  5.0
                                    ON
                                                                                                               1µF
                                                                                                                                                                            OUTPUT VOLTAGE (V)




                    1µF                                     SHDN
                                                                                                                                                                                                  4.0
                                               OFF
                                                                     GND
                                                                                                                                                                                                  3.0
                                                                                                                                                                                                                                                                 VOUT = 3.3V, ILOAD = 75mA
                                       IN QFN                                               N µMA
                                    2-P                                                  -PI                                                                                                     2.0
                                                                                                     X
                                                                                     8
                                1




                                                                                                      1mm




                                                                    ODER
                                                                                   5mm




                                                                                                                                                                                                 1.0
                                                    m
                            4m




                                                   1m




                                                                                                     1,




                                                                                         3,1
                                m




                                    x 4mm x
                                                                                     x




                                                                                               mm x
                                                                                                                                                                                                   0
                               1,48W                                                   Preisgünstig mit
                           Verlustleistung                                           0,36W Verlustleistung                                                                                              0     1.0              2.0                    3.0                4.0                       5.0        6.0
                               €1,69*                                                       €1,60*                                                                                                                                    INPUT VOLTAGE (V)
                                                           WÄHLEN SIE
                                                         LEISTUNG ODER
                                                              PREIS

†1000-up recommended resale. Price provided is for design guidance and is FOB USA. International prices will differ due to local duties, taxes, and exchange rates.
New! Schematics and Bills of
Materials Online
Choose Proven, Lab-Tested Circuits from Maxim’s Growing Library of
Applications
    Maxim has placed over 30 useful power-supply application circuits on our website for you to
browse and download. You can sort the list by topology, input voltage, or output voltage and download
schematics and component bills of materials, including part numbers and vendor names. You can also
submit an application for an evaluation board to be built for you. Check the list often for new
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                           Sort By                                              Sort By                                  Download                             Request
                           Input                                                Output                                   Schematic and                        Evaluation
                           Voltage                                              Current                                  Bill of Materials                    Board




                     Input Voltage         Output Voltage            Output Current                                                                    Schematic and        Evaluation
     Topology                                                                                                            Key Attributes
                          (V)                   (V)                       (A)                                                                          Bill of Materials      Board
  Step-Down                 5                     1.2                           6                   Tracking supply for DDR termination                      Download         Request
  Step-Up                  2.5                     5                            3                   Internal switch, smallest size, synchronization          Download         Request
  Inverter                 3.3                    -5.2                         0.3                  <3mm profile, very low ripple                            Download         Request
  Multi-Output             12              3.3, 2.5, 1.8, -4.8           1, 0.3, 0.2, 0.06          Low-cost, single controller design                       Download         Request



USB Power Management IC
Integrates ±15kV Transient
Voltage Suppressors
Highest Integration Saves Board Space, Cost, and Design Time, Fits
in a 10-Pin µMAX Package
      ROBUST TRANSIENT VOLTAGE                                                                                                            LOW QUIESCENT CURRENT LDO REGULATOR
      SUPPRESSORS FOR DATA LINES                                         MAX5005                                                           ♦ 3.3V/150mA OUTPUT
        ♦ IEC 1000-4-2 AIR DISCHARGE                                     MAX5006
                                                                                                                                           ♦ 30µA SUPPLY CURRENT INDEPENDENT OF LOAD
          VOLTAGE TO ±15kV                                               MAX5007
                                                                                 LDO                    3.3V
                                                                                                                           VCC
                                                                                                                                           ♦ STABLE WITH 1µF CERAMIC OUTPUT CAPACITOR
        ♦ IEC 1000-4-2 CONTACT DISCHARGE             VBUS
                                                             5V               REGULATOR
                                                                                                               1µF
          VOLTAGE TO ±8kV                                                                    1.5kΩ
                                                                                                               CERAMIC
                                                        D+
        ♦ 6A SURGE CURRENT RATING                       D-
                                                       GND
                                                                               OPEN                                        RST


                                              USB PORT
                                                                                                                           D+
                                                                                      SUPERVISORY
                                                                                                                           D-
                                                                                                        RESET

      INTERNAL D+ AND D- TERMINATION
                                                                          ENABLE SELR                                      3.3V USB
      RESISTOR AND CONTROL                                                                                               CONTROLLER       µP RESET CIRCUIT
        ♦ USE SELR PIN TO CONFIGURE USB
          PERIPHERAL FOR FULL SPEED OR                                                                                                     ♦ ENABLES USB CONTROLLER
          LOW SPEED                                                                                                                          WHEN VOUT IS IN
                                                                  Part                Reset Output                                           REGULATION
        ♦ USE ENABLE PIN TO DESELECT INTERNAL
          TERMINATION RESISTOR                                                                                                             ♦ 200ms TIMEOUT PERIOD
                                                              MAX5005                   Open Drain
                                                              MAX5006           Push-Pull Active Low
                                                              MAX5007           Push-Pull Active High
Smart Dual USB Switch Reduces
Software Overhead with
Auto Turn-Off/-On
1                                                                                   5
    SHORT APPLIED                                                                         SHORT-CIRCUIT REMOVED AND
                                                SHORT-CIRCUIT                             AUTOMATICALLY DETECTED BY MAX1823
                                               FAULT RESPONSE                             (COMPETITION REQUIRES DETECTION
2                                                                                         CIRCUIT & MANUAL POWER RECYCLING)
    FAULT INDICATOR
                                                                         5V, VIN
    TRIPS AFTER 20ms BLANKING                  MAX1823
    TO PREVENT HOT-SWAP GLITCHES                                         5V
                                                                                   VOUT
                                                                         0
                                                                                               6
3                                                                        5V                        20ms RESET SIGNAL ALLOWS
    FAULT-CONDITION                                                                FAULT
                                                                         0         INDICATOR
                                                                                                   PROPER SYSTEM START-UP
    CURRENT LIMITED TO 350mARMS
    BY PULSING (COMPETITOR'S                                             1A
                                                                                   IOUT
    CURRENT SHOOTS TO ISHORT)                                            0


                                                                                    7
                                                    t = 10ms/div                          SWITCH TURNS ITSELF ON 20ms
4                                                                                         AFTER DETECTING FAULT REMOVAL
    SWITCH TURNS ITSELF OFF
    AFTER 20ms (COMPETITION WAITS                                                         (COMPETITION REQUIRES MICRO-
    FOR MICROPROCESSOR SIGNAL,                                                            PROCESSOR SIGNAL)
    WASTING POWER & RISKING DAMAGE)




World’s Smallest, Dual, Current-
Limited Switch with Fault-Blanking
     The MAX1812 is the world’s smallest, dual, current-limited switch for USB applications. Each
channel is guaranteed to supply 500mA and meets all USB specifications. Internal fault-blanking
prevents momentary faults (capacitive loads) from resetting the host system and eliminates the need
for external components.


                  INTERNAL FAULT-BLANKING SAVES COMPONENTS AND PREVENTS HOT-SWAP GLITCHES

                                                                              TO USB
                            INA        500mA     OUTA                         PORT A
             5V                       SWITCH
                                                                                                                         IN µMA
                                                                                                                      0-P
                                                                                                                               X
                                                                                                                  1




                            FAULTA    20ms
                                                                                                                                  mm
                                                                                                                3mm




                                      DELAY                       INTERNAL
                                                                  BLANKING                                         x4
                                                                                                                                .1




                                                                                                                        .9 m m x 1
      HOST                                                    ELIMINATES FOUR
       µP
                                                                 EXTERNAL                                       AREA = 2.95mm x 4.9mm
                                                                COMPONENTS                                      HEIGHT = 1.11mm, MAX
                            FAULTB    20ms
                                      DELAY

                                                                              TO USB
                            INB        500mA     OUTB                         PORT B
             5V                       SWITCH

                            MAX1812
NEW36V Input, 20W Output Step-Downs
Save Space                                                                                                                                     EFFICIENCY vs. LOAD CURRENT
                                                                                                                                                       (VOUT = 5.0V)
                                                                                  Nµ                                            100
                                                                               -PI M                                                                            B




                                                                                       AX
                                                                          10
                                                                                                                                               A
• High-Voltage Operation                                                                                                        80
                                                                                                                                                                               D
  (Up to 36VIN)                                                            m                                                                                         C




                                                                          3



                                                                                       m




                                                                                                               EFFICIENCY (%)
                                                                               m x 5m
                                                                                                                                60
• 10-Pin µMAX Package
                                                             INPUT                                                              40
• Up to 330kHz Switching                                  4.5V TO 36V
                                                                                                                                                                               A: VIN = 7.2V
  Frequency Reduces                                                                                                             20                                             B: VIN = 12.0V
  Component Sizes                                         47µF
                                                                                                 4.7µF
                                                                                                                                                                               C: VIN = 24.0V
                                                                                                                                                                               D: VIN = 36.0V
                                                                                                                                 0
• Output Power >20W                                                            V+
                                                                                                                                      0.0001       0.001     0.01        0.1         1          10
                                                     ON                                VH                                                                   LOAD CURRENT (A)
• High Efficiency                                           OFF           SHDN             EXT                                                             OUTPUT
                                                                                                                                                           3.3V/5V
• 90µA Quiescent Supply                                                                                                                                    UP TO 4A
  Current                                                                      MAX1744
                                                                                                              22µH
                                                                                            CS                                           40mΩ
• 4µA Shutdown Current
                                                                                        OUT                                                                         220µF
• Output Voltage: 3.3V/5V                                                 VL     REF    GND

  (MAX1744) Adj. 1.25V to                                         4.7µF             0.1µF
  18V (MAX1745)



Smallest Step-Down Converter with
24V Internal MOSFET Switch
3-/4-Cell Li+ Powered, Low IQ, Keep Alive, and Wake-On LAN Supply
     The MAX1837 delivers up to 250mA, the MAX1836 delivers up to 125mA, and the MAX1776
delivers up to 500mA, permitting optimal inductor selection. The MAX1836/MAX1837 come in a 6-pin
SOT23 package, and the MAX1776 comes in an 8-pin µMAX package. Both convert directly from 24V
inputs, eliminating the intermediate step-down voltage that wastes over 15% of the battery life and
increases complexity. Applications include I/O, audio, keep-alive, WLAN, and video supplies in
notebook and hand-held systems powered by up to four lithium batteries and AC-DC adapters.

                          DIRECT STEP-DOWN FROM 24V WITHOUT 2-STAGE EFFICIENCY LOSS

                                                                                                                  OUTPUT
                                                                                                                1.25V TO VIN
                        INTERNAL                                                           WLAN
                                                                                           RTC                 UP TO 500mA
                      24V P-CHANNEL                                                        AUDIO              90% EFFICIENCY
                         MOSFET                            P
                                                                                           VIDEO

                                                                                           I/O
                                                                                                                          IQ = 12µA
                                                                                                                                                             MAX1836/MAX1837

                 DIRECT CONVERSION                    MAX1836
                                                                                                                                                                    125mA/250mA
                  FROM 4.5V TO 24V                                                                       IQ = 15µA                                                   6-PIN SOT23
                 (FOUR Li+ OR AC-DC                                                                      MAX1776
                      ADAPTER)
                                                                                                            500mA
                                                                                                         8-PIN µMAX

      Direct conversion from 24V to 3.3V saves 15% power by eliminating compound efficiency losses generated when converting
      from 24V to 5V and then from 5V to 3.3V.
1MHz, 600mA Step-Down Powers DSP
Cores Using Inexpensive Capacitors
High-Speed Converter Provides Excellent Line and Load Regulation
Using Tiny, 4.7µF Ceramic Capacitors Instead of Expensive, High-
ESR Tantalum Capacitors
                                                                               • 600mA Guaranteed Output
                                                                                 Current
    INPUT                                               OUTPUT 1.8V AT 600mA
 2.5V to 5.5V                                  4.7µH   ADJUSTS DOWN TO 1.25V
                                                                               • 1MHz PWM Switching Frequency
                       BATT              LX
4.7µF                                                         4.7µF
                                                                               • Requires only 4.7µF Ceramic
          ON
                OFF    SHDN                                                      Capacitor
          PWM          SKIP   MAX1821    FB                                    • Excellent Line and Load Regulation
                 PFM
                                                                               • Synchronize to 2.5G (19.8MHz)
                       REF              COMP
                                                                                 or 3G (13MHz) System Clock
                               GND
                                                                               • Programmable Output Voltage
                                                                                 from 1.25V to 5.5V
                                                                               • No Schottky Diode Required

     The MAX1821 is the first 1MHz PWM converter capable of delivering precision line and load regu-
lation for the latest DSP cores using low-ESR ceramic input and output capacitors. The precision line
and load regulation is achieved through an innovative current-mode control algorithm. Its unique
slope compensation and high-bandwidth error amplifier, combined with a simple external compensa-
tion circuit, stabilize the converter with only a small 4.7µF ceramic capacitor. The MAX1821
can operate in PWM or PFM mode to maximize standby and operational efficiencies. To maximize
battery life, the MAX1821 delivers > 93% efficiency using an integrated low RDSON switch and synchro-
nous rectifier.


Smallest 250mA Step-Downs Achieve
95% Efficiency for Sub-2V Logic
     The MAX1733/MAX1734 step-down DC-                                                        OUTPUT
                                                        INPUT                        1.25V TO 2.5V (M
DC converters deliver over 250mA to outputs                                                          AX
                                                                                      1.5V OR 1.8V (M 1733)
                                                     2.7V TO 5.5V                                    AX1734)
as low as 1.25V and have 1.5% output voltage                                       10µH     UP TO 250mA
                                                                    IN
accuracy. The input voltage range of 2.7V to                                    LX
5.5V makes these devices ideal for portable
                                                                       MAX1734
applications powered from a single lithium cell,
                                                          ON
from three alkaline or NiCd/NiMH cells, or                          SHDN
                                                                               OUT
                                                                OFF                                          SO
from a regulated 3.3V or 5V supply.                                                                       PIN T
                                                                                                               23
                                                                                                          5-




     These converters use a unique proprietary
current-limited control scheme that maintains                            GND
                                                                                                        m
                                                                                                          3



                                                                                                               m




a low 40µA quiescent supply current, while                                                                m x 3m
their high 1.2MHz (max) switching frequency
and internal synchronous rectification significantly improve efficiency and minimize solution size. This
reduces external component size and eliminates the external Schottky diode required with conven-
tional step-down converters. Only three small external components are needed for a complete DC-DC
solution.
     The MAX1733 provides a resistor-adjustable output voltage, while the MAX1734 is available in a
variety of preset output voltages. Both devices are available in space-saving 5-pin SOT23 packages.
Reduce WCDMA PA Current Draw
83% with Dynamically Controlled
Step-Down DC-DC
High-Speed DC-DC Adjusts 2.5G and 3G PA Supplies to Match
Transmit Power
                                                                                                                                 REDUCE BATTERY CURRENT
                                                                                                                                   FROM 62mA TO 11mA
     The MAX1820 is the first step-down                                                                1000
converter designed specifically for PAs in 2.5G
and 3G cellular phones. The baseband
processor dynamically programs the converter




                                                                                BATTERY CURRENT (mA)
                                                                                                                                           PA CONNECTED TO BATTERY
output voltage based on the variable power
required by the PA. The high-speed MAX1820                                                             100
converter varies its output voltage from 0.4V to
3.4V in less than 30µs, tracking the PA transmit                                                                    SAVE 83% BATTERY CURRENT
power envelope. By matching the PA supply                                                                                                                             PA CONNECTED
voltage envelope, the PA minimizes power loss                                                                                                                          TO MAX1820
and maximizes battery life. The MAX1820 is                                                              10
                                                                                                              -10          -5          0            5       10       15        20    25
equipped       with    a    divide-by-13      or
                                                                                                                                            TRANSMIT POWER (dBm)
divide-by-18 phase-locked-loop (PLL) to
synchronize to a 2.5G or 3G system clock. An
actual test with a WCDMA PA proved this                                                                                  OUTPUT OF HIGH-SPEED DC-DC
synchronization method does not add spurious                                                                        TRACKS PA POWER ENVELOPE WITHIN 30µs
noise into the RF band.
                                                                                                                                                                 DATA MODE
                                                                                                                                                                                            PA SUPPLY
                                                                                                                       FAST 30µs                                                            VOLTAGE
                                                                                                                     SETTLING TIME

                                                                                                                                                                                            500mV/div


                         ONLY SUPPLY WITH
                        DAC INPUT FOR DIRECT
                          COMMUNICATION                                                                                     VOICE MODE
                        FROM BB PROCESSOR
                                                                                                                                                        400µs/div


                                                       INPUT
                                                    2.7V TO 4.2V
                                                                                                                                                                           DYNAMIC OUTPUT
                                                       Li+ BATTERY                                                              BATT                     4.7µH            0.4V TO 3.4V IN 30µs
                                                                                                                    SYNC                       LX                            UP TO 600mA
                                                                                                                                                         4.7µF
                                                                                                                            MAX1820
                                                                         VOUT CONTROL                               REF                       OUT
                                                                              DAC                                               GND

                                                        13MHz OR 18MHz
                                                         SYSTEM CLOCK
                    CLOCK SYNC                                                                                                                              2.5G AND 3G
                                                                                                                                                            FIXED-GAIN
                   REDUCES NOISE                                                                                     RF TRANSMIT SECTION
                                                                                                                                                             LINEAR PA
                MAX1820Z    NO SYNC                                        BASEBAND
                MAX1820Y*   ÷ 18 PLL                                      PROCESSOR

                MAX1820X*   ÷ 13 PLL                                                                                  RF RECEIVE SECTION




*Future product—contact factory for availability.
Triple, Low-Noise, Low-Dropout
Linear Regulators Provide Complete
RF Power
67dB PSRR, Low-Crosstalk Voltage, and 45µVRMS Noise Provide
Flawless Transmission
    The MAX8890 contains three identical 100mA, low-noise linear regulators in a low-profile 4mm x
4mm x 0.85mm QFN package. Their 67dB PSRR, low-crosstalk voltage, and 45µVRMS noise make
them ideal for the noise-sensitive RF sections of cellular phones and wireless PDAs. Low 50mV
dropout at 100mA load maximizes battery life. Output voltages are preset from 1.8V to 3.3V in 50mV
increments. The MAX8890 is priced at $0.99†.

                                             3 LOW-NOISE LDOs IN A SINGLE QFN PACKAGE
                                                                                                                                      67dB POWER-SUPPLY
                                      CERAMIC INPUT AND
                                                                                                                                        REJECTION RATIO                                                                                                     LOW-CROSSTALK VOLTAGE
                                      OUTPUT CAPACITORS                                                                   80                                                                                    1000
                                          SAVE COST                                                                       70
                                                                                                                                                                                                                                                           LOW-IMPEDANCE INPUT
                                                                                                                                                                                                                                                           IOUT1 = 100mA SINUSOIDAL LOAD
                                                                                                                                                                                                                                                           IOUT3 = 10mA
                                                                              3 OUTPUTS                                   60




                                                                                                                                                                                                 CROSSTALK (µVp-p)
                                                                                                                                                                                                                     100
           INPUT                                                             1.8V TO 3.3V                                 50

                                                                                                              PSRR (dB)
        2.5V TO 5.5V                                                            100mA                                     40
                                              IN1             OUT1
             Li+                                                                                                          30
                        4.7µF                 IN2                                        2.2µF                                                                                                                       10
           BATTERY                                                                                                        20         CIN = 1µF + 0.1µF
                                              IN3                                                                                    IOUT = 10mA
                                                                             1.8V TO 3.3V                                 10

                                              EN1
                                                    MAX8890                     100mA                                     0                                                                                                      0
                                                              OUT2                                                             0.1         1             10      100                    1000                                                        0.1                1             10           100        1000
       INDEPENDENT    ON                                                                 2.2µF                                                 FREQUENCY (kHz)                                                                                                               FREQUENCY (kHz)
                                              EN2
         CONTROLS               OFF
                                                                                                                                                                                                   IN QFN
                                              EN3                            1.8V TO 3.3V                                                                                                       2-P



                                                                                                                                                                                         1
                                                                                100mA




                                                                                                                                                                                                                                                            mm
                                                                                                                                                                                      4mm
                                              BP              OUT3
                                                                                                            FACTORY PRESET



                                                                                                                                                                                                                                                          85
                        0.01µF                        GND                                                                                                                                  x
                                                                                         2.2µF               OUTPUTS SAVE                                                                       4 m m x 0.
                                                                                                                SPACE

     †1000-up recommended resale. Price provided is for design guidance and is FOB USA. International prices will differ due to local duties, taxes, and exchange rates.




First Dual 160mA LDOs in SOT23
     The MAX8882/MAX8883 are                                                                                                                                                                                                                                                PSRR VS. FREQUENCY
dual, low-noise, low-dropout                                      50% SPACE SAVINGS AND EXCELLENT AC PERFORMANCE
                                                                                                                                                                                                                                                          80

                                                                                                                                                                                                                                                          70
linear regulators that operate                                                                                                                                                                                                                            60
                                                                                                                                                                                                                                                                                 >75dB
from a 2.5V to 6.5V input and                                                                      INCREDIBLE 1.0Ω                                                                                                                                        50                 at up to 10kHz!
                                                                                                                                                                                                                     PSRR (dB)




deliver up to 160mA of continu-                                                                  MOSFET PASS SWITCHES                                                                                                                                     40                                   >65dB
                                                                                                                                                                                                                                                          30                              at up to 100kHz!
ous output current from each                                                 INPUT
                                                                                                                                                                                                                                                          20
                                                                          2.5V TO 5.5V
output. These devices are less                                                                                                                    DUAL                                                                                                    10
                                                                                                       IN
than half the size of their closest                                                       ON
                                                                                                                           OUTA
                                                                                                                                                 OUTPUTS
                                                                                                                                                                                            R
                                                                                                                                                                                                                                                           0
                                                                                                       SHDNA                                     UP TO 160mA          G R EA T P S R                                                                            0.01       0.1      1     10     100         1000
competition, yet their ultra-                                                                    OFF                                             1.8V TO 3.3V                                                                                                                    FREQUENCY (kHz)

                                                                   0.7W ION
                                                                                                            MAX8883
                                                                                                                                                                                                                                                                         CHANNEL-TO-CHANNEL
low 1.0Ω on-resistance is lower                                       AT                                                   OUTB
                                                                                                                                                UP TO 160mA
                                                                                                                                                                                                                                                                       ISOLATION VS. FREQUENCY
                                                                 ISSIP
                                                                                         ON                                                     1.8V TO 3.3V
                                                                                                       SHDNB
                                                                D                                                                                                                                                                                         100
than most single-LDO competi-
                                                                                                                                                                                                                      CHANNEL-TO-CHANNEL ISOLATION (dB)




                                                                                                 OFF                                                             G
                                                                                                                                                                     RE
                                                                                                                                                                          AT                                                                              90
                                                                                                              GND                                                              IS O
                                                                                                                                                                                      L A TI O N
tion in the same package. Each                                              SO
                                                                                                                                                                                                                                                          80

                                                                         PIN T                                                                                                                                                                            70                    >90dB
                                                                              23




LDO has only 72mV dropout at                                                                                                                                                                                                                                                at up to 10kHz
                                                                 6-




                                                                                                                                                                                                                                                          60
                                                                                                                                                                                                                                                          50                             >85dB
80mA for longest battery life.
                                                                2.8




                                                                                 m




                                                                                                                                                                                                                                                          40                        at up to 100kHz           >65dB
                                                                     m
                                                                              m




                                                                         m x 2.9        DUAL LDOs IN                                                                                                                                                                                                      at up to 1MHz
Both devices are available in fixed                                                  TINY SOT23 PACKAGE                                 UP TO 160mA
                                                                                                                                                                                                                                                          30
                                                                                                                                                                                                                                                          20
                                                                                                                                     FROM EACH OUTPUT
output voltages of 2.85V/2.85V,                                                                                                                                                                                                                           10
                                                                                                                                                                                                                                                           0
3.3V/2.5V, 3.3V/1.8V, 3V/3V                                                                                                                                                                                                                                     0.01       0.1      1        10     100      1000
                                                                                                                                                                                                                                                                                 FREQUENCY (kHz)
and 2.5V/1.8V.                                                  These dual linear regulators offer better AC performance
                                                                and lower dropout voltages than single devices requiring twice the board space.
First 500mA Linear Regulator with
0.8V Output in 1.3W µMAX Package
     The MAX1806 delivers outputs down to 0.8V at 500mA for new and future processor core power
supplies. The small µMAX package is specially constructed to dissipate 1.3W, which is 3.6 times more
than the competitor’s parts in the same package. Output voltage tolerance is ±1% and is preset (to
save space and cost) or adjustable from 0.8V to 4.5V (for flexibility). A Power-OK output signal
indicates when the output voltage drops from its nominal value by more than 7%. It includes current
limiting and shuts off in the event of short-circuit or thermal-overload faults. The MAX1806 uses a
P-channel MOSFET power switch so there is no large base current draw, even in dropout.

• Guaranteed 500mA Output
                                                                                                               OPERATING RANGE, VOUT = 0.8V
• Regulated Outputs Down to 0.8V                                                         600
• ±1% Voltage Accuracy:
  Preset Voltages: 0.8V, 1.5V,                                                           500
  1.8V, 2.5V, or 3.3V


                                                                   OUTPUT CURRENT (mA)
  Adjustable Range: 0.8V to 4.5V                                                         400

• Power-OK Output                                                                                              MAX1806
                                                                                         300                  1.3W µMAX
• 1.3W, 1.1mm-High 8-Pin µMAX                                                                                    RANGE
  Package                                                                                200

• 2.25V to 5.5V Input Range                                                              100
                                                                                                             COMPETITOR’S
• Low 175mV Dropout at 500mA                                                                                    RANGE
                                                                                          0
• 210µA Quiescent Supply Current                                                           2.0         2.5         3.0   3.5       4.0     4.5         5.0     5.5    6.0
• 0.02µA Shutdown Current                                                                                                INPUT VOLTAGE (V)




World’s Smallest 0.5A and 1A
Linear Regulators
Special High-Power Packages Dissipate 1.3W and 1.5W
                              MAX1792                                                                                    MAX1793
                        0.5A, LOW-DROPOUT                                                                    1A, LOW-DROPOUT
                  LINEAR REGULATOR IN 1.3W µMAX                                                       LINEAR REGULATOR IN 1.5W TSSOP
                                           x = 5.0mm
                                                       SM 51%                                                                              x = 6.5mm
                                                                                                                                                              SM 34%
                  x = 6.2mm                              ALL                                           x = 6.7mm
                                                                                                                                                                ALL
                                                            ER                                                                                                     ER
                               y = 3.1mm                                                                                       y = 5.1mm
      y = 5.1mm                                                                           y = 7.5mm



                8-PIN SO          8-PIN µMAX              1.1mm                                      SOT223                       16-PIN TSSOP
              AREA = 31mm2                                 HIGH                                   AREA = 50.3mm2                                             ONLY 1.1mm
                                 AREA = 15mm2                                                                                    AREA = 33.2mm2                 HIGH




• ±1% Output Voltage Accuracy                                     • Low 130mV Dropout at 0.5A (MAX1792)
• Fixed Outputs (1.5V, 1.8V, 2.5V,                                • Low 210mV Dropout at 1.0A (MAX1793)
  3.3V, 5.0V) or Adjustable from                                  • Thermal Overload Protection
  2V to 5V
Lowest Dropout and Lowest Cost
SOT23 and QFN LDOs for Baseband
and RF Chipsets
                                                                                               Output
       Part                                         Features                                                                         Output Voltages (V)
                                                                                           Capacitance (µF)

                       20mA output, 2µA quiescent current,
MAX1725/6                                                                                            1                           1.8, 2.5, 3.3, 5, or Adj 1.5 to 5
                       reverse-battery protection

MAX1818                120mV dropout at 500mA                                                    3.3                        1.5, 1.8, 2.0, 2.5, 3.3, 5, or Adj 1.25 to 5

MAX8863/4              120mA output, reverse-battery protection                                      1                          2.8, 2.84, 3.15, or Adj 1.25 to 6.5

MAX8867/8              150mA output, reverse-battery protection                                      1                         Fixed 2.5 to 5 in 100mV increments

MAX8875                150mA output with POK, reverse-battery protection                             1                         Fixed 2.5 to 5 in 100mV increments

MAX8877/8              150mA output, thin 1.1mm (max) height, reverse-battery                        1                         Fixed 2.5 to 5 in 100mV increments
                       protection

MAX8880/1              200mA output, reverse-battery protection                                      1                           1.8, 2.5, 3.3, 5, or Adj 1.25 to 5

MAX8882/3              Dual 160mA output LDOs in SOT23                                           2.2                          Fixed 1.8 to 3.3 in 100mV increments
                                                                                                                                                                               CUSTOMIZED
MAX8887/8              150mV dropout at 300mA, thin 1.1mm (max) height                           2.2                          Fixed 1.5 to 3.3 in 100mV increments               OUTPUT
                                                                                                                                                                                VOLTAGES
MAX8890                Triple 100mA output LDOs in 4mm x 4mm QFN                                 2.2                          Fixed 1.8 to 3.3 in 50mV increments



Battery Chargers Selector Table
                                                                            Charge
                   No. of Series         Cell             Charge                               EV
     Part                                                                 Termination                                          Features                               Pin-Package
                     Li+ Cells         Chemistry           Rate                                Kit
                                                                            Method
                                                                           Voltage and
MAX745                  1 to 4              Li+              Fast                              Yes       High-efficiency switch-mode controller                        20-SSOP
                                                                           current limit
                                                                                                         SBS Level 2 (1.0 compliant) smart battery charger,
MAX1645A                1 to 4         Independent           Fast               —              Yes                                                                     28-SSOP
                                                                                                         SMBus interface, current-limiting input
                                                                             SMBus                       SMBus serial interface, Level 2 Duracell/                     16-NSO,
MAX1647                  —             Independent     Fast, up to 4A                          Yes
                                                                            controlled                   Intel-compliant charger                                       20-SSOP
                                                                             SMBus                       SMBus serial interface, Level 2 Duracell/
MAX1667                   4            Independent     Fast, up to 4A                          Yes                                                                     20-SSOP
                                                                            controlled                   Intel-compliant charger
                                                                           Voltage and                   28VIN external switches, sync rectified step-down
MAX1737                 1 to 4              Li+        Fast, up to 4A                          Yes                                                                     28-SSOP
                                                                           current limit                 controller, input-current-limit loop, timers
                                                                           Voltage and                   14VIN internal switches, sync rectified step-down,
MAX1757                 1 to 3              Li+        Fast, up to 1.5A                        Yes                                                                     28-SSOP
                                                                           current limit                 input-current-limit loop, timers
                                                                           Voltage and                   28VIN internal switches, sync rectified step-down,
MAX1758                 1 to 4              Li+        Fast, up to 1.5A                        Yes                                                                     28-SSOP
                                                                           current limit                 input-current-limit loop, timers
                                                         Fast, up to       Voltage and                   Linear charger, internal switch,
MAX1811                   1                 Li+                                                —                                                                      8-SO (1.4W)
                                                          500mA            current limit                 power through USB port, 0.5% precision
                                                         Fast, up to       Voltage and                   Pulse charger, ext switch, no heat
MAX1879                   1                 Li+                                                —                                                                           8-µMAX
                                                          800mA            current limit                 dissipation, upgrade to MAX1679
                                                                           Voltage and                   28VIN lowest cost step-down controller,
MAX1873R/S/T            2/3/4             Li+/Ni       Fast, up to 4A                          Yes                                                                     16-QSOP
                                                                           current limit                 300kHz PWM, input-current-limit loop
                                                                           Voltage and                   28VIN ext switches, sync rectified
MAX1772                 2 to 4         Independent     Fast, up to 4A                          Yes                                                                     28-QSOP
                                                                           current limit                 step-down controller, input-current-limit loops

                                                                           IMIN, timer                   15VIN, ext switch pulse charger
DS2770*                   1               Li+/Ni             Fast                           DS2770K*                                                                   16-TSSOP
                                                                                                         integrated with fuel gauge
*Future product—contact factory for availability.
  Cool Li+ Battery Charger Has
  Virtually No Power Dissipation
  Safe, Simple, and Inexpensive Pulse Charger Dissipates No Heat

           PULSE CHARGING DECREASES SYSTEM                                             Safety Features Include:
             HEAT AND INCREASES RELIABILITY                                            • Continuous Over/Undervoltage
                                                                                         Protection
                     INPUT
                 CURRENT-LIMITED                                                       • ±0.75% Charge Voltage Tolerance
                                                        ONLY ONE EXTERNAL FET
                   WALL-CUBE
                    5V TO 22V
                                                        REQUIRED FOR COMPLETE
                                                             Li+ CHARGER
                                                                                       • 6.25-Hour Charging Time-Out
                     800mA                     P-Ch                                      Prevents Infinite Trickle-Charge
           OPTIONAL                                                   0.75% VOLTAGE
                                                                                       • Safely Precharges Near-Dead Cell
                                   IN          GATE
             LED                                                         ACCURACY
                                                                                       • Over/Undertemperature Protection
                                  CHG          BATT
                                                                                       • Automatic Charging Restart at 4V
                                        MAX1879                        SINGLE Li+
                                                                Li+     BATTERY        • Safe, Simple, and Inexpensive Pulse
                                  THERM           GND
                                                                                         Charger Dissipates No Heat
          TEMPERATURE
           PROTECTION                                                                  • Evaluation Kit Available to
           (OPTIONAL)                                                                    Speed Designs


    RE
FUTU CT
PROD
    U
     Single-Cell Li+ Protector Enables
   Power Control Function in
   Battery Pack
        The DS2720* single-cell Li+ protection IC integrates memory, overtemperature protection, and the
   ability to communicate with the host processor, along with the standard over/undervoltage and over-
   charge protection found in popular standalone protectors. Because the host can communicate with the
   DS2720, it can control the protection MOSFETs in software, enabling power control through the
   DS2720 and MOSFET.
   • Li+ Safety Circuit;
     • Overvoltage Protection
     • Overcurrent/Short-Circuit                                                               PACK +
       Protection
     • Undervoltage Protection                                                        HOST
     • Overtemperature Protection                                                                             DS2720
                                                                                               DATA     PLS
   • Controls High-Side N-Channel                                                                                 DC      +
                                                                                                        DQ
     Power MOSFETs                                                                                                CC      -
                                                                                                        PS       VDD
   • System Power Management and                                                                        VSS       CP
     Control Feature Support                                                                   PACK -

   • 8 Bytes of Lockable EEPROM                                                       POWER
                                                                                      SWITCH
   • 1-Wire®, Multinode Digital
     Communication Interface
   • 8-Pin µSOP Package
    *Future product—contact factory for availability.
    1-Wire is a registered trademark of Dallas Semiconductor.
       Electronically Label Battery Packs
       with Low-Cost, 1-Wire Digital
       Interface ICs
                                                                                  V+

                                BASEBAND                      4.7kΩ                                                  TIME     ADC
                                                                              DATA                      64-BIT
                               PROCESSOR/
                                                                                                         ROM         TEMP      E2
                                  ASIC                                            V-
                                                                                                                                           PROTECTOR
                                                                                                                                          (Lithium only)
                                                            HANDSET                          BATTERY PACK


            • 1-Wire Digital Interface                                                                 • Real-Time Clock (DS2415)
            • Unique 64-Bit Serial Number                                                              • Local Temperature Sensor:
            • Reduces Battery Contacts                                                                   9 Bit to 12 Bit (DS1822),
              Reduced to Three, Regardless                                                               13 Bit (DS2436)
              of Device Chosen                                                                         • Battery-Voltage ADC:
            • User-Programmable EEPROM:                                                                  10 Bit (DS2436)
              16 Bits (DS1822), 256 Bits                                                               • 512-Bit SHA-1 Encryption
              (DS2436) 1024 Bits (DS2432)                                                                Engine (DS2432)
          Dallas Semiconductor silicon label ICs tag a unique and unchangeable electronic label to the battery
      pack. Each offers an array of feature functions to fit different cellular phone applications. The low-cost
      DS2401 is the base model of this series, containing a 64-bit ROM accessible from the 1-Wire serial digital
      interface. The DS2415 adds a real-time clock to the serial number, eliminating the need to have a back-
      up battery for the real-time clock in the host product. The DS1822 replaces thermistors in the battery
      pack by integrating a local digital thermometer and 16 bits of EEPROM to the 64-bit ROM. The DS2432
      features 1024 bits of user EEPROM and a 512-bit SHA-1 algorithm that encrypts the EEPROM array.
      The security offered in the DS2432 deters non-OEM battery packs, thus enhancing accessory revenue
      and more importantly, increasing the safety to the user of the product with lithium-based packs. The
      DS2436 provides data storage in the form of the 64-bit ROM and 256-bit user EEPROM, and replaces the
      pack thermistor and ADCs in the host reserved for measuring pack voltage.
                                                      Battery Pack ID Solutions Selector Table
                          64-Bit      Real-Time          1-Wire       EEPROM           Local Temp        Voltage       Fuel      Li+                            Pin-Package
            Part                                                                                                                             EV Kit
                          ROM           Clock           Interface      (Bytes)         Sensor (Bits)    ADC (Bits)    Gauge   Protector                            (mm2)
                                                                                                                                                           TO-92, 6-TSOC,
        DS2401                             —                             —                  —              —            —           —          —
                                                                                                                                                           CSP (1.4 x 0.7)
                                                                                                                                                           6-TSOC,
        DS2415                                                           —                  —              —            —           —          —
                                                                                                                                                           Flip Chip (1.4 x 1.1)
                                                                                                                                                           6-TSOC,
        DS2432                             —                          1024 bits             —              —            —           —          —
                                                                                                                                                           Flip Chip (2.5 x 1.8)
                                                                                                                                                           TO-92, 8-SO,
        DS1822                             —                             2                  12             —            —           —       DS1701K
                                                                                                                                                           Flip Chip (2.0 x 1.4)
        DS2436                             —                             32                 13              10          —           —       DS2436K        TO-92, 8-SO

        DS2438                                                           40                 13              10                      —       DS2438K        8-SO
                                                                                                                                Single                     16-TSSOP,
       DS2760                              —                             32                 11              11                              DS2760K
   NEW                                                                                                                           cell                      Flip Chip (3.2 x 2.7)

     E DS2770*                             —                             32                 11              11                      —      DS2770K*        16-TSSOP
FUTUR
                                                                                                                                Single
     E DS2720*                             —                             8                  —              —            —                  DS2720K*        8-µSOP
FUTUR                                                                                                                            cell

        *Future product—contact factory for availability.
Power 3 White LEDs from Single Li+
with 0.3% Brightness Matching
Lowest Dropout (200mV) Current Regulator Fits in 1mm-Thin SOT23
     The MAX1916 triple-output current regulator provides significantly better matching than tradi-
tional ballast resistor schemes and provides longer battery life. Ballast resistors only provide 2:1 LED
matching. The MAX1916 regulates three LED currents with 0.3% matching, eliminating costly factory
calibration and the need to purchase LEDs with matched forward voltages (VF). 200mV dropout allows
LEDs to be powered directly from a single-cell lithium-ion (Li+) battery for a longer time, extending
battery life.

                               TRIPLE WHITE LED SUPPLY IS SUPERIOR TO BALLAST RESISTORS
                200mV
                                               BETTER THAN                                                                                  BETTER MATCHING, LONGER BATTERY LIFE
           DROPOUT EXTENDS
                                             0.3% LED-TO-LED                                                                     30
             BATTERY LIFE
                                                MATCHING

                                                                                                                                                              ADDS 350mV
                     Li+       +                                                                                                 25
                                                                    VCNTL                                                                                   TO BATTERY LIFE
                  BATTERY                                                                                                                                                                  GOOD CURRENT
                  2.5V, 5.5V                                                                                                                                                                 MATCHING
                                                                                                                                            3 RANDOM LEDs


                                                                                                              LED CURRENT (mA)
                                                                                                                                 20         USING MAX1916
   THIN SOT23                      LED1    LED2   LED3
   1mm HEIGHT                                                                                                                                                                   350mV
                                                                                                                                 15                                                                             POOR CURRENT
                                                                                                                                                                                                                  MATCHING
                        ON                               SET
                                   EN                                                                                                                                                              SAME 3 LEDs USING
                OFF                       MAX1916                                 SIMPLE
                                                                                                                                 10                                                            34.8Ω BALLAST RESISTORS
                                                                                BRIGHTNESS
                                                                                 CONTROL
                                           GND
                                                                                                                                  5
                                                                                                                                      3.0          3.2         3.4                       3.6          3.8               4.0            4.2
                                                                                                                                                              BATTERY VOLTAGE (V)
    The MAX1916 eliminates costly factory calibration and special batch ordering while improving battery life and brightness matching.




High-Efficiency SOT23 Step-Up
Current Source Powers Up to 6 White
LEDs with Uniform Brightness
      The MAX1848 is the
                                                                    SERIES LEDs HAVE MATCHED LED                                                                                             40% MORE EFFICIENT,
first high-efficiency step-up
                                                                  CURRENT AND UNIFORM BRIGHTNESS                                                                                           1.8x LONGER BATTERY LIFE
DC-DC converter that
regulates current instead of                                                                                                                                                    90
                                                                   LOWER INPUT RIPPLE                                                  MATCHED CURRENT
voltage to power white LEDs                                        THAN CHARGE PUMP                    OUTPUT                                  =
                                                                                                                                                                                85
                                                      INPUT                                           UP TO 13V                                                                 80
for backlights in cell phones                      2.6V TO 5.5V        33µH                          UP TO 60mA                       UNIFORM BRIGHTNESS
                                                                                                                                                                                75
                                                                                                                                                                                                                                    NEW
                                                                                                                                                                                                                                 MAX1848
and PDAs. It powers two or                               3.3µF                                                                                                                  70                              1.8x
                                                                                                                                                                                                                              WITH THREE LEDs
                                                                                                                                                               EFFICIENCY (%)




                                                                      V+            LX       OUT                                                                                                              LONGER
three white LEDs in series                                                                         1µF                                                                          65
                                                                                                                                                                                                              BATTERY            IN SERIES
                                                                             MAX1848         GND                                                                                60                              LIFE
(up to 6 total), instead of in                       LOGIC OR                                                                                                                   55
                                                                      CNTL                                      20Ω               25Ω
parallel, to eliminate bright-                         DAC

                                                                      COMP
                                                                                              CS
                                                                                                     RSENSE
                                                                                                                                                                                50
                                                                                                       5Ω                                                                       45
ness mismatch caused by                               0.15µF
                                                                                                                                                                                        DOUBLING CHARGE
                                                                                                                                                                                40
different threshold voltages.                                                                                                                                                   35      PUMP WITH THREE                  IOUT = 15mA
                                                                                                               NO CALIBRATION:                                                           LEDs IN PARALLEL
An internal N-channel                             PROGRAMMABLE
                                                                                                         5% CURRENT TOLERANCE WITH
                                                                                                                                                                                30
                                                    BRIGHTNESS                                                                                                                    3.0                   3.5                    4.0           4.5
MOSFET switch provides                                                            SO
                                                                               PIN T
                                                                                                             STANDARD LOW-COST
                                                                                                                                                                                                         INPUT VOLTAGE (V)
                                                                                                                CHIP RESISTOR
                                                                                     23
                                                                           8-




85% efficiency, 40% better
than traditional doubling                                                                                                                                                                 NO BALLAST RESISTORS AND
                                                                      2.8




                                                                                         m




                                                                           m                                                                                                               NO FACTORY CALIBRATION
                                                                                         m




                                                                                m x 2.9
charge-pump solutions.
Most Efficient 1.4MHz SOT23
Current-Mode Step-Up DC-DC
Converter
0.7Ω On-Resistance and 200µA IQ—Highest Efficiency
    The MAX1896 uses current-mode control and 1.4MHz fixed-frequency pulse-width modulation
(PWM) to provide over 90% efficiency, fast transient response, and operation with physically smaller
components. It features 200µA quiescent supply current, low RON (on-resistance), 0.01µA logic-
controlled shutdown current, and programmable soft-start. The MAX1896 is intended for PDAs, LCD
panels, and hand-held equipment.

       INPUT                  MOST EFFICIENT & SMALLEST SOT23 13V STEP-UP CONVERTER
    2.6V to 5.5V

                                                                                                                               BETTER EFFICIENCY
                                                                                   OUTPUT                            100
                                                                                  UP TO 13V,                                                       MAX1896
                         6                                 1                     UP TO 600mA                         90




                                                                                                    EFFICIENCY (%)
                             IN                     LX
                                                                                                                     80
                                    MAX1896
                   OFF   4                                                                                           70                           COMPETITION
                             SHDN
       ON                                                                 R1
                                                           3                                                         60                               VIN = 3.3V
                                                    FB                                     SO
        OPTIONAL         5                                                              PIN T                                                         VOUT = 5V
                                                                                              23
                                                                                   6-




       SOFT-START
                             SS        GND                                                                           50
                                                                     R2
                                          2                                                                                0   100         200       300           400
                                                                                  3.0




                                                                                                m




                                                                                    m
                                                                                              m




                                                                                        m x 3.0
                                                                                                                               OUTPUT CURRENT (mA)
   The MAX1896 is pin compatible with the LT1613 and has higher efficiency due to lower switch on-resistance and lower quiescent
   supply current.



World’s First Step-Up Converters
with “Reverse-Battery” Protection
SOT23 Boost Converters Use Only 4µA and Integrate Protection to
Save Cost
       PROTECTION INTEGRATED; SYNCHRONOUS RECTIFIER INTEGRATED
                                                INTERNAL SWITCH                  OUTPUT
                                                OPENS IF BATTERY                2V TO 5.5V
                                                  IS REVERSED                  UP TO 150mA
                   NO REVERSE CURRENT                                                                  PART
                   (IN-FAULT CONDITION)                                                                                        IN SHUTDOWN                 OUTPUT
                                                                                                      NUMBER
                                                                           P
                                                                                                                               Battery connects
                                                                                                       MAX1832                                       Adjustable (2V to 5.5V)
               -                                                                                                                    to load
                                                                     N
    BATTERY                                                                                                                    Battery connects
                                                                                                       MAX1833                                             Fixed 3.3V
  ACCIDENTLY                    FAULT                                                                                               to load
   REVERSED                   CONDITION                                             TINY
                                                           MAX1832                                                             Battery and load
                                                                                6-PIN SOT23            MAX1834                                       Adjustable (2V to 5.5V)
                                                           MAX1833              SAVES SPACE
                                                                                                                                 disconnect
            +                                              MAX1834
    INPUT                                                                                                                      Battery and load
                                  ON                SHDN                                               MAX1835                                             Fixed 3.3V
    RANGE                                                  MAX1835                                                               disconnect
                                          OFF
 1.5V TO 5.5V                                                  GND

				
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