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TM

ISL6440

Data Sheet

September 2001

File Number

9040

Advanced PWM and Triple Linear Power

Controller for Gateway Applications

The ISL6440 provides the power control and protection for

four output voltages required by microprocessors used in

high-performance, graphics intensive gateway applications.

The IC integrates a voltage-mode PWM controller and three

linear controllers, as well as the monitoring and protection

functions into a 28-pin SOIC package. The PWM controller

regulates the microprocessor core voltage with a

synchronous-rectified buck converter. The linear controllers

regulate the computer system鈥檚 AGP 1.5V or 3.3V bus

power, the 1.5V GTL bus power, and the 1.8V power for the

North/South Bridge core voltage and/or cache memory

circuits. The ISL6440 includes an Intel-compatible, TTL

5-input digital-to-analog converter (DAC) that adjusts the

core PWM output voltage from 1.3V

DC

to 2.05V

DC

in 0.05V

steps and from 2.1V

DC

to 3.5V

DC

in 0.1V increments. The

precision reference and voltage-mode control provide

鹵1%

static regulation. The AGP bus power linear controller鈥檚

output (V

OUT2

) is user-selectable, through a TTL-compatible

signal applied at the SELECT pin, for levels of 1.5V or 3.3V

with

鹵3%

accuracy. Based on the status of the FIX pin, the

other two linear regulators provide either fixed output

voltages of 1.5V鹵3% (V

OUT3

) and 1.8V鹵3% (V

OUT4

), or

user-adjustable by means of an external resistor divider. All

linear controllers can employ either N-Channel MOSFETs or

bipolar NPNs for the pass transistor.

The ISL6440 monitors all the output voltages. A single

Power Good signal is issued when the core is within

鹵10%

of

the DAC setting and all other outputs are above their under-

voltage levels. Additional built-in overvoltage protection for

the core output uses the lower MOSFET to prevent output

voltages above 115% of the DAC setting. The PWM

controller鈥檚 overcurrent function monitors the output current

by using the voltage drop across the upper MOSFET鈥檚

r

DS(ON)

.

Features

鈥?Provides four regulated voltages

- Microprocessor core, AGP bus, memory, and GTL bus

power

鈥?Drives N-Channel MOSFETs

鈥?Linear regulator drives compatible with both MOSFET and

bipolar series pass transistors

鈥?Fixed or externally resistor-adjustable linear outputs (FIX pin)

鈥?Simple single-loop control design

- Voltage-mode PWM control

鈥?Fast PWM converter transient response

- High-bandwidth error amplifier

- Full 0鈥?00% duty ratio

鈥?Excellent output voltage regulation

- Core PWM output:

鹵1%

over temperature

- Other outputs:

鹵3%

over temperature

鈥?TTL-compatible 5-bit DAC microprocessor core output

voltage selection

- Wide range . . . . . . . . . . . . . . . . . . . . . . . . 1.3V鈥?.5V

DC

鈥?Power-good output voltage monitor

鈥?Overvoltage and overcurrent fault monitors

- Switching regulator does not require extra current

sensing element, uses MOSFET鈥檚 r

DS(ON)

鈥?Small converter size

- Constant frequency operation

- 200kHz free-running oscillator; programmable from

50kHz to over 1MHz

- Small external component count

Pinout

ISL6440 (SOIC)

TOP VIEW

DRIVE2 1

FIX 2

VID4 3

28 VCC

27 UGATE

26 PHASE

25 LGATE

24 PGND

23 OCSET

22 VSEN1

21 FB

20 COMP

19 VSEN3

18 DRIVE3

17 GND

16 VAUX

15 DRIVE4

Ordering Information

PART NUMBER

ISL6440CB

ISL6440EVAL1

TEMP.

RANGE (

o

C)

0 to 70

PACKAGE

28 Ld SOIC

PKG.

NO.

M28.3

VID3 4

VID2 5

VID1 6

VID0 7

PGOOD 8

SD 9

VSEN2 10

SELECT 11

SS 12

FAULT/RT 13

VSEN4 14

Evaluation Board

Applications

鈥?Power Regulation for Gateway Processors

鈥?Residential Gateways

鈥?Home Servers

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, All Rights Reserved

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