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廬

ISL6554

Data Sheet

February 11, 2005

FN9003.3

Microprocessor CORE Voltage Regulator

Using Multi-Phase Buck PWM Control

Without Programmable Droop

The ISL6554 is the first controller in the Intersil Multi-Phase

family without the programmable droop feature. The

ISL6554 in combination with the HIP6601A, HIP6602A or

HIP6603A companion gate drivers and Intersil MOSFETs

form a complete solution for high-current, high slew-rate

applications. The ISL6554 regulates output voltage,

balances load currents and provides protective functions for

two to four synchronous-rectified buck-converter channels.

A novel approach to current sensing is used to reduce

overall solution cost. The voltage developed across the

lower MOSFET鈥檚 parasitic on-resistance during conduction

is sampled and fed back to the controller. This lossless

current-sensing approach allows the controller to maintain

phase-current balance between the power channels and

overcurrent protection.

A 5-bit DAC allows digital programming of the output voltage

in 25mV steps over a range from 0.95V to 1.70V with a

system accuracy of

鹵1%.

Internal pull ups on each DAC

input make external pull-up resistors unnecessary when

interfacing with open-drain output signals.

The PGOOD signal is held low during soft-start until the

output voltage increases to within 4% of the programmed.

When the CORE voltage falls 9% below the programmed

VID level, an undervoltage condition is detected and results

in PGOOD transitioning low.

In the event of an overvoltage condition, The converter shuts

down and turns ON the lower MOSFETs to clamp and

protect the microprocessor. Overcurrent protection reduces

the regulator RMS output current to 41% of the programmed

overcurrent trip value. These features provide monitoring

and protection for the microprocessor and power system.

Features

鈥?Multi-Phase Power Conversion

鈥?Precision Channel Current Balance

- Lossless Current Sampling - Uses r

DS(ON)

鈥?Precision CORE Voltage Regulation

-

鹵1%

System Accuracy Over Temperature

- No Programmable Droop

鈥?Microprocessor Voltage Identification Input

- 5-Bit VID Decoder

- 0.95V to 1.70V in 25mV Steps

鈥?Fast Transient Response

鈥?Overcurrent Protection

鈥?Selection of 2, 3, or 4 Phase Operation

鈥?High Ripple Frequency (80kHz to 2MHz)

鈥?Pb-Free Available (RoHS Compliant)

Applications

鈥?Power Supply Controller for Intel廬 Itanium鈩?Processor

Family

鈥?Voltage Regulator Modules

鈥?Servers and Workstations

Ordering Information

PART NUMBER

ISL6554CB

ISL6554CB-T

ISL6554CBZ (Note)

ISL6554CBZ-T (Note)

ISL6554CBZA (Note)

TEMP. (擄C)

0 to 70

PACKAGE

20 Ld SOIC

PKG.

DWG. #

M20.3

20 Ld SOIC Tape and Reel

0 to 70

20 Ld SOIC

(PB-free)

M20.3

20 Ld SOIC Tape and Reel (PB-free)

0 to 70

20 Ld SOIC

(PB-free)

M20.3

Pinout

VID4 1

VID3 2

VID2 3

VID1 4

VID0 5

COMP 6

FB 7

FS/DIS 8

GND 9

ISL6554 (SOIC)

TOP VIEW

20 VCC

19 PGOOD

18 PWM4

17 ISEN4

16 ISEN1

15 PWM1

14 PWM2

13 ISEN2

12 ISEN3

11 PWM3

ISL6554CBZA-T (Note)

20 Ld SOIC Tape and Reel (PB-free)

NOTE: Intersil Pb-free products employ special Pb-free material sets;

molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with

both SnPb and Pb-free soldering operations. Intersil Pb-free products

are MSL classified at Pb-free peak reflow temperatures that meet or

exceed the Pb-free requirements of IPC/JEDEC J STD-020C.

VSEN 10

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

|

Intersil (and design) is a trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2001, 2004, 2005. All Rights Reserved. Intel廬 is a registered trademark of Intel Corporation.

Itanium鈩?is a trademark of Intel Corporation. All other trademarks mentioned are the property of their respective owners.

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