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Intersil New Three Phase PWM Controller IC Offers Best in Class by liaoqinmei




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  Intersil’s New Three-Phase PWM Controller IC Offers Best-in-Class Performance
                     for CPU Core Power on VR 10.X Platforms
         --3-phase controller brings high integration, high precision and lowest overall solution cost
            --5 X 5 mm near-chip-scale package offers small footprint and high thermal efficiency
                          --ICs offer choice of cost-saving current sensing schemes

MILPITAS, CA, February 16, 2004 – Intersil Corporation (NASDAQ: ISIL), a world leader in the design
and manufacture of high performance analog solutions, today announced the new Endura™ ISL6565 three-
phase synchronous-buck PWM controller IC targeted to power Intel® Pentium® 4 processors on VR 10.X
platforms. The ISL6565 offers higher integration, lower overall solution cost, both popular current sensing
topologies, and the precision voltage control that is required for next-generation VR 10.X platforms to
ensure stable upset-free operation of the CPU. This precision is partly attributed to the ISL6565’s on-chip
current sense temperature compensation, 0.5% system voltage accuracy, remote voltage sensing, Intersil’s
Dynamic VID® technology and voltage offset control.

A and B versions of these ICs offer designers the choice of either RDS(ON) current sensing (ISL6565A)
or inductor DC resistance (DCR) current sensing (ISL6565B). These cost- and space-saving methods of
current sensing make it possible to meet VR 10.X platform specifications for accurate load line
programming, sometimes referred to as output voltage droop. Additionally, current sensing is used for
phase-to-phase balancing and over-current protection. To help ensure the accuracy of droop,
programmable internal temperature compensation is provided to compensate for the effect that changes in
temperature have on the lower MOSFET’s RDS(ON) and output inductor DCR current sense elements.

A unity-gain differential amplifier is provided for remote voltage sensing, which provides the advantage
of avoiding any voltage potential difference between remote and local grounds that would otherwise
introduce error and degrade voltage accuracy. The precision threshold-sensitive enable input is available
to accurately coordinate the start up of the ISL6565A and ISL6565B with Intersil’s MOSFET driver ICs.
Intersil’s Dynamic-VID® technology allows seamless on-the-fly voltage changes utilizing the voltage
identification (VID) bus. The offset pin allows accurate voltage offset settings that are independent of
VID bus setting.

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ISL6565, Page Two

The high 1.5-MHz maximum per-phase switching frequency of the ISL6565 ensures very low high-
frequency ripple voltage that is easily filtered using smaller inductors and fewer than usual capacitors.
This saves space and cost.

The ISL6565A & B are offered in the near-chip-scale 28-pad 5 X 5 mm quad flat no-lead (QFN) and the
28-lead TSSOP packages. The QFN package provides enhanced thermal efficiency by transferring heat
directly to the printed circuit board via a copper land on the ICs underbelly and the perimeter contact
pads. The ISL6565 can run three phases at maximum switching frequency without the need for additional
and costly heat sinking.

ISL6565 Technical Summary
      2 or 3 phase power conversion
      Precision VR 10.X core voltage regulation
      Differential remote voltage sensing
      +/-0.5% system accuracy over temperature and life
      Adjustable reference-voltage offset
      Precision RDS(ON) or DCR current sensing
           o Cost-saving and lossless
           o Integrated programmable temperature compensation
           o Accurate load-line programming
           o Accurate channel-current balancing
      Input Voltage: 12-V or 5-V bias
      Microprocessor voltage identification input
           o Dynamic VID® technology
           o 6-Bit VID input, 0.8375 V to 1.600 V in 12.5-mV steps
      Threshold enable function for precision sequencing
      Over-current protection and over-voltage protection
      Digital soft start
      Operation frequency up to 1.5 MHz per phase
      Package options: 28-lead SOIC, 28-lead TSSOP, 28-pad 5 X 5 mm QFN

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ISL6565, Page Three

ISL6565 Pricing and Availability
The ISL6565 is available now. The suggested resale price in 100- to 999-unit quantities is $2.15 for each IC.

Additional information on these and other high-performance power solutions can be obtained online from
Intersil’s Power Web site at:

Interested persons are invited to discuss their power needs with our marketing staff at the Intel Developer
Forum in San Francisco, February 17-19, and at APEC 2004 in Anaheim, February 23-26. Contact Mark
E. Hazen for briefings.

About Intersil
Intersil Corporation is a leader in the design and manufacture of high performance analog
semiconductors. The company’s products address three of the industry’s fastest growing markets - flat
panel displays, optical storage (CD and DVD recordable) and power management. Intersil products
include power management devices for battery management, hot-swap and hot-plug controllers, linear
regulators, supervisory ICs, switching DC-DC regulators and power MOSFET drivers; optical storage laser
diode drivers; DSL line drivers; video and high performance operational amplifiers; data converters;
interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for
military, space and rad-hard applications. For more information about Intersil or to find out how to
become a member of our winning team, visit the company’s web site and career page at:

This release may include "forward looking statements" that are subject to risks and uncertainties. For information identifying
economic, political, climatic, currency, regulatory, technological, competitive and some other important factors that could
cause actual results to differ materially from those anticipated in the forward looking statements, see Intersil’s Safe Harbor
Forward Looking Statement disclaimer found at, as well as Intersil’s SEC filings as updated
from time to time, found at


Endura is a trademark of Intersil Americas Inc.
Dynamic VID is a registered trademark of Intersil Americas Inc.
Intel and Pentium are registered trademarks of Intel Coporation.
                          All other trademarks mentioned are the property of their respective owners.

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