Advanced Pulse-Width Modulation (PWM) Controller for Home Gateways

The ISL6431 is a high efficiency, fixed frequency, synchronous buck PWM controller. It is designed for use in applications that convert 5V to lower distributed voltages required for set-top box, cable modem, DSL modem and residential home gateway core processor, memory and peripheral power supplies.

Features

? Operates from +5V Input

? 0.8V to VIN Output Range

- 0.8V Internal Reference

- ±1.5 Over Line Voltage and Temperature

? Drives N-Channel MOSFETs

? Simple Single-Loop Control Design

- Voltage-Mode PWM Control

? Fast Transient Response

? Lossless, Programmable Overcurrent Protection

- Uses Upper MOSFET’s rDS(ON)

? Small Converter Size

- 300kHz Fixed Frequency Oscillator

- Internal Soft Start

- 8 Lead SOIC Package

? High Conversion Efficiency

? Synchronous/Standard Buck Configuration

Applications

? Cable Modems, Set Top Boxes, and DSL Modems

? DSP and Core Communications Processor Supplies

? Power Supplies for Microprocessors and Embedded Controllers

? Memory Supplies

? Personal Computer Peripherals

? Industrial Power Supplies

? 5V-Input DC-DC Regulators

? Low-Voltage Distributed Power Supplies