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