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ISL6432CB

PWM and Triple Linear Power Controller for Home Gateway Applications

Renesas Electronics 

DATASHEET

ISL6432

PWM and Triple Linear Power Controller for Home Gateway Applications

FN9019

Rev 0.00

Jun 1, 2001

The ISL6432 provides the power control and protection for

four output voltages for use with high-performance

microprocessor and embedded controller based

communications chip sets. The IC integrates a voltage-mode

PWM controller and three linear controllers, as well as

monitoring and protection functions into a 16-lead SOIC

package. The PWM controller is intended to regulate the

microprocessor memory core voltage with a synchronous-

rectified buck converter. The linear controllers can be

configured to generate DSP power, as well as upstream and

downstream voltages. Both the switching regulator and

linear voltage references provide 2% of static regulation

over line, load, and temperature ranges. All outputs are

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

linear controllers employ bipolar NPNs for the pass

transistors.

The ISL6432 monitors all the output voltages. The PWM

controller’s adjustable overcurrent function monitors the

output current by using the voltage drop across the upper

MOSFET’s rDS(ON). The linear regulator outputs are

monitored via the FB pins for undervoltage events.

Ordering Information

PART NUMBER TEMP. RANGE (oC) PACKAGE

PKG.

NO.

ISL6432CB

0 to 70

16 Ld SOIC M16.15

ISL6432EVAL1 Evaluation Board

Applications

• Low-Power Distributed DC-DC Conversion

• Cable Modem and DSL Modem Power Regulation

• High Performance Memory Applications

Features

• Provides 4 Regulated Voltages

- Memory Core, Embedded Controller/DSP, Tuner

• Drives Bipolar Linear Pass Transistors

• Externally Resistor-Adjustable Outputs

• Simple Single-Loop Control Design

- Voltage-Mode PWM Control

• Fast PWM Converter Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Ratio

• Excellent Output Voltage Regulation

- All Outputs: 2% Over Temperature

• Overcurrent Fault Monitors

- Switching Regulator Does Not Require Extra Current

Sensing Element, Uses MOSFET’s rDS(ON)

• Small Converter Size

- 300kHz Constant Frequency Operation

- Small External Component Count

• ACPI Compatible

• Voltage Sequencing

Pinout

ISL6432 (SOIC)

TOP VIEW

DRIVE2 1

FB2 2

FB 3

COMP 4

GND 5

PHASE 6

BOOT 7

UGATE 8

16 FB3

15 DRIVE3

14 FB4

13 DRIVE4

12 OCSET

11 VCC

10 LGATE

9 PGND

FN9019 Rev 0.00

Jun 1, 2001

Page 1 of 12

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