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