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廬

ISL6526

Data Sheet

July 2003

FN9055.3

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

Ordering Information

TEMP

PART NUMBER RANGE (

o

C)

ISL6526CB

ISL6526ACB

ISL6526CR

ISL6526ACR

ISL6526IB

ISL6526AIB

ISL6526IR

ISL6526AIR

ISL6526EVAL1

ISL6526EVAL2

0 to 70

0 to 70

0 to 70

0 to 70

-40 to 85

-40 to 85

-40 to 85

-40 to 85

PACKAGE

14 Lead SOIC

14 Lead SOIC

PKG DWG. #

M14.15

M14.15

Applications

鈥?Power Supplies for Microprocessors

- PCs

- Embedded Controllers

鈥?Subsystem Power Supplies

- PCI/AGP/GTL+ Busses

- 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

16 Lead 5x5 QFN L16.5x5B

16 Lead 5x5 QFN L16.5x5B

14 Lead SOIC

14 Lead SOIC

M14.15

M14.15

16 Lead 5x5 QFN L16.5x5B

16 Lead 5x5 QFN L16.5x5B

ISL6526 SOIC Evaluation Board

ISL6526 QFN Evaluation Board

ISL6526AEVAL1 ISL6526A SOIC Evaluation Board

ISL6526AEVAL2 ISL6526A QFN Evaluation Board

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. 2003. All Rights Reserved.

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

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