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廬

ISL6526

Data Sheet

August 2004

FN9055.5

Single Synchronous Buck Pulse-Width

Modulation (PWM) Controller

The ISL6526 makes 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

integrates the control, output adjustment, monitoring and

protection functions into a single package.

The ISL6526 provides simple, single feedback loop, voltage-

mode control with fast transient response. The output

voltage can be precisely regulated to as low as 0.8V, with a

maximum tolerance of 鹵1.5% over temperature and line

voltage variations. A fixed frequency oscillator reduces

design complexity, while balancing typical application cost

and efficiency.

The error amplifier features a 15MHz gain-bandwidth

product and 6V/碌s slew rate which enables high converter

bandwidth for fast transient performance. The resulting

PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by

monitoring the r

DS(ON)

of the upper MOSFET to inhibit PWM

operation appropriately. This approach simplifies the

implementation and improves efficiency by eliminating the

need for a current sense resistor.

Features

鈥?Operates from 3.3V to 5V Input

鈥?0.8V to V

IN

Output Range

- 0.8V Internal Reference

- 鹵1.5% Over Load, Line Voltage and Temperature

鈥?Drives N-Channel MOSFETs

鈥?Simple Single-Loop Control Design

- Voltage-Mode PWM Control

鈥?Fast Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Cycle

鈥?Lossless, Programmable Overcurrent Protection

- Uses Upper MOSFET鈥檚 r

DS(on)

鈥?Converter can Source and Sink Current

鈥?Small Converter Size

- Internal Fixed Frequency Oscillator

- ISL6526: 300kHz

- ISL6526A: 600kHz

鈥?Internal Soft-Start

鈥?14 Lead SOIC or 16 Lead, 5x5 QFN

鈥?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

鈥?Pb-free Available

Applications

鈥?Power Supplies for Microprocessors

- PCs

- Embedded Controllers

鈥?Subsystem Power Supplies

- PCI/AGP/GTL+ Buses

- ACPI Power Control

- DDR SDRAM Bus Termination Supply

鈥?Cable Modems, Set Top Boxes, and DSL Modems

鈥?DSP and Core Communications Processor Supplies

鈥?Memory Supplies

鈥?Personal Computer Peripherals

鈥?Industrial Power Supplies

鈥?3.3V-Input DC-DC Regulators

鈥?Low-Voltage Distributed Power Supplies

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2001-2004. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

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