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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