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ISL6554
(Rev.:2001)

Microprocessor CORE Voltage Regulator Using Multi-Phase Buck PWM Control Without Programmable Droop

Intersil 

TM

Data Sheet

ISL6554

November 2001 File Number 9003.1

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’s 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 ±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

• Multi-Phase Power Conversion

• Precision Channel Current Balance

- Lossless Current Sampling - Uses rDS(ON)

• Precision CORE Voltage Regulation

- ±1% System Accuracy Over Temperature

- No Programmable Droop

• Microprocessor Voltage Identification Input

- 5-Bit VID Decoder

- 0.95V to 1.70V in 25mV Steps

• Fast Transient Response

• Over Current Protection

• Selection of 2, 3, or 4 Phase Operation

• High Ripple Frequency (80kHz to 2MHz)

Applications

• Power Supply Controller for Intel® Itanium™ Processor

Family

• Voltage Regulator Modules

• Servers and Workstations

Ordering Information

PART NUMBER TEMP. (oC) PACKAGE PKG. NO.

ISL6554CB

0 to 70 20 Ld SOIC M20.3

ISL6554CB-T

20 Ld SOIC Tape and Reel

Pinout

ISL6554 (SOIC)

TOP VIEW

VID4 1

VID3 2

VID2 3

VID1 4

VID0 5

COMP 6

FB 7

FS/DIS 8

GND 9

VSEN 10

20 VCC

19 PGOOD

18 PWM4

17 ISEN4

16 ISEN1

15 PWM1

14 PWM2

13 ISEN2

12 ISEN3

11 PWM3

Intel™ is a trademark of Intel Corporation.

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 © Intersil Americas Inc. 2001. All Rights Reserved

Intel® is a registered trademark of Intel Corporation. Itanium™ is a trademark of Intel Corporation

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