Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

The ISL6526, ISL6526A make simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6526, ISL6526A integrate the control, output adjustment, monitoring and protection functions into a single package.

Features
• Operates from 3.3V to 5V Input
• 0.8V to VIN Output Range
    - 0.8V Internal Reference
    - ±1.5% Over Load, 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
    - Internal Fixed Frequency Oscillator
        - ISL6526: 300kHz
        - ISL6526A: 600kHz
• Internal Soft-Start
• 14 Ld SOIC or 16 Ld 5x5 QFN
• QFN Package:
    - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
        No Leads - Package Outline
    - Near Chip Scale Package Footprint, which Improves
        PCB Efficiency and has a Thinner Profile
• Pb-Free (RoHS Compliant)

Applications
• Power Supplies for Microprocessors
    - PCs
    - Embedded Controllers
• Subsystem Power Supplies
    - PCI/AGP/GTL+ Buses
    - ACPI Power Control
    - DDR SDRAM Bus Termination Supply
• Cable Modems, Set-Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 3.3V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies