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									LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

D D D D D D D

Excellent Temperature Stability Initial Tolerance . . . 0.2% Max Dynamic Impedance . . . 0.6 Ω Max Wide Operating Current Range Directly Interchangeable With LM136 Needs No Adjustment for Minimum Temperature Coefficient Surface-Mount Three-Lead Package

D PACKAGE (TOP VIEW)

NC NC NC ANODE

1 2 3 4

8 7 6 5

CATHODE NC CATHODE ADJ

NC – No internal connection

description
The LT1009 reference circuit is a precision-trimmed 2.5-V shunt regulator featuring low dynamic impedance and a wide operating current range. The maximum initial tolerance is ± 5 mV in the LP package and ± 10 mV in the D package. The reference tolerance is achieved by on-chip trimming, which minimizes the initial voltage tolerance and the temperature coefficient αvz. Although the LT1009 needs no adjustments, a third terminal (ADJ ) allows the reference voltage to be adjusted ± 5% to eliminate system errors. In many applications, the LT1009 can be used as a terminal-for-terminal replacement for the LM136-2.5, which eliminates the external trim network.
LP PACKAGE (TOP VIEW)

ANODE CATHODE ADJ

logic symbol
ANODE CATHODE

ADJ

The LT1009 uses include 5-V system references, 8-bit ADC and DAC references, and power-supply monitors. The device also can be used in applications such as digital voltmeters and current-loop measurement and control systems. The LT1009C is characterized for operation from 0°C to 70°C. The LT1009I is characterized for operation from – 40°C to 85°C.
AVAILABLE OPTIONS PACKAGED DEVICES TA SMALL OUTLINE (D) LT1009CD LT1009ID PLASTIC CYLINDRICAL (LP) LT1009CLP LT1009ILP CHIP FORM (Y) LT1009Y

0°C to 70°C – 40°C to 85°C

The D and LP packages are available taped and reeled. Add the suffix R to device type (e.g., LT1009CDR). Chip forms are tested at 25°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright © 1999, Texas Instruments Incorporated

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

schematic
CATHODE Q14 Q11

24 kΩ Q8 Q7 30 pF 10 kΩ Q2 Q9 Q4 Q1 Q3 Q6 Q12 Q5 720 Ω

24 kΩ

6.6 kΩ

20 pF

Q10 500 Ω 30 kΩ ADJ 6.6 kΩ

Q13

ANODE All component values shown are nominal.

absolute maximum ratings over operating free-air temperature range†
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Package thermal impedance, θJA, (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D and LP packages . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operation at the absolute maximum TJ of 150°C can impact reliability. 2. The package thermal impedance is calculated in accordance with JESD 51.

recommended operating conditions
MIN Operating free air temperature range TA free-air range, LT1009C LT1009I 0 –40 MAX 70 85 UNIT °C

2

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

electrical characteristics at specified free-air temperature
PARAMETER TEST CONDITIONS D package VZ Reference voltage IZ = 1 mA LP package D package LP package VF Forward voltage IF = 2 mA IZ = 1 mA, VADJ = GND to VZ IZ = 1 mA, VADJ = 0.6 V to VZ – 0.6 V D package Full range LP package 0°C to 70°C – 40°C to 85°C IZ = 400 µA to 10 mA 25°C Full range 25°C 25°C Full range 20 0.3 1 1.4 2.6 10 12 20 0.3 1 1.4 15 4 25 20 2.6 6 mV 10 ppm/khr 15 30 ppm/°C TA† 25°C Full range 25°C LT1009C MIN 2.49 2.495 2.485 2.491 0.4 125 25°C 45 5 45 15 mV TYP 2.5 MAX 2.51 MIN 2.49 LT1009I TYP 2.5 2.5 MAX 2.51 2.505 2.525 2.52 1 V V UNIT

2.5 2.505 2.495 2.515 2.475 2.509 1 2.48 0.4 125

Adjustment range

mV

∆VZ(t Z(temp) )

Change in reference voltage with temperature Average temperature coefficient of reference voltage‡ Change in reference voltage with current Long-term change in reference voltage Reference impedance

αVZ

∆VZ

∆VZ/∆t

IZ = 1 mA

zz

IZ = 1 mA

Ω

† Full range is 0°C to 70°C for the LT1009C and – 40°C to 85°C for the LT1009I. ‡ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

electrical characteristics at TA = 25°C
PARAMETER VZ VF Reference voltage Forward voltage Adjustment range ∆VZ(temp) α VZ ∆VZ ∆VZ/∆t Change in reference voltage with temperature Average temperature coefficient of reference voltage‡ Change in reference voltage with current Long-term change in reference voltage IZ = 400 µA to 10 mA IZ = 1 mA TEST CONDITIONS IZ = 1 mA IF = 2 mA IZ = 1 mA, IZ = 1 mA, VADJ = GND to VZ VADJ = 0.6 V to VZ – 0.6 V LT1009Y MIN 2.49 0.4 125 45 2.5 15 2.6 20 TYP 2.5 MAX 2.51 1 UNIT V V mV mV ppm/°C mV ppm/khr

zz Reference impedance IZ = 1 mA 0.3 1 W ‡ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS†
REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE
2.53 Iz = 1 mA 2.52 V Z – Reference Voltage – V ∆V Z – Change in Reference Voltage – mV 4 5

CHANGE IN REFERENCE VOLTAGE vs REFERENCE CURRENT

2.51

3

2.5

2

2.49

2.48

1

2.47 – 50

– 25

100 0 25 50 75 TA – Free-Air Temperature – °C

125

0 0 4 8 12 16 IZ – Reference Current – mA 20

Figure 1
REVERSE CURRENT vs REVERSE VOLTAGE
10 – 1 1.2 TJ = 25°C 1 I R – Reverse Current – A V F – Forward Voltage – V 10 – 2

Figure 2
FORWARD VOLTAGE vs FORWARD CURRENT

0.8

10 – 3

0.6

TJ = 125°C 10 – 4 TJ = – 55°C TJ = 25°C 1 1.4 1.8 2.2 VR – Reverse Voltage – V 2.6

0.4

0.2

10 – 5 0.6

0 0.001

0.01 0.1 1 IF – Forward Current– mA

10

Figure 3

Figure 4

† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.

4

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS
REFERENCE IMPEDANCE vs FREQUENCY
100 Iz = 1 mA TJ = – 55°C to 125°C z z – Reference Impedance – Ω 200 10 Hz 250 Iz = 1 mA TJ = 25°C

NOISE VOLTAGE vs FREQUENCY

V n – Noise Voltage – nV/ 0.1 1 10 f – Frequency – kHz 100

150

1

100

0.1 0.01

50 10

100

1k 10 k f – Frequency – Hz

100 k

Figure 5
TRANSIENT RESPONSE
3.5 3 2.5 Input and Output Voltages – V 2 1.5 1 0.5 0 Input Output 5 kΩ Output

Figure 6

8 4 0 0

Input

1 t – Time – µs

20

Figure 7

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

APPLICATION INFORMATION
5 V to 35 V 3.6 k٠Output LT1009 10 kن Trim

†This does not affect temperature coefficient. It provides ± 5% trim range.

Figure 8. 2.5-V Reference
3.6 V to 40 V V+ LM334 V–

R 62 Ω

LT1009

10 kΩ

Figure 9. Adjustable Reference With Wide Supply Range

LT1084 VI 10 µF IN ADJ OUT 10 µF 1.2 kΩ 374 Ω LT1009 VO

2 kΩ

Figure 10. Power Regulator With Low Temperature Coefficient

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LT1009 2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

APPLICATION INFORMATION
5V 5.1 kΩ

5V –5 V

5.1 kΩ

LT1009

10 kΩ 1% Output

9.76 kΩ 1% 500 Ω

5 kΩ –5 V

Figure 11. Switchable ± 1.25-V Bipolar Reference
1 µF

10 kΩ VI ≥ 6 V

1 kΩ 10 kΩ + 100 kΩ LT1009 + 1 kΩ

– 2.5 V + 20 µF 20 µF LT1001C

Figure 12. Low-Noise 2.5-V Buffered Reference

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Copyright © 1999, Texas Instruments Incorporated


								
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