Advanced Pulse Width Modulation (PWM) Controller for Broadband Applications

The ISL6431A 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 DSL modems, cable and DSL routers and broadband 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
    - High-Bandwidth Error Amplifier
    - Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
    - Uses Upper MOSFET’s rDS(on)
• Converter Can Source and Sink Current
• Small Converter Size
    - 300kHz Fixed Frequency Oscillator
    - Internal Soft Start
    - 8-Lead SOIC Package

Applications
• Cable/DSL Routers and DSL Modems
• DSP and Core Communications Processor Supplies
• Broadband Gateways
• Memory Supplies
• Industrial Power Supplies
• 5V-Input DC-DC Regulators
• Low-Voltage Distributed Power Supplies