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廬

ISL6522A

Data Sheet

April 13, 2005

FN9122.2

Buck and Synchronous Rectifier

Pulse-Width Modulator (PWM) Controller

The ISL6522A provides complete control and protection for

a DC-DC converter optimized for high-performance

microprocessor applications. It is designed to drive two

N-Channel MOSFETs in a synchronous rectified buck

topology. The ISL6522A integrates all of the control, output

adjustment, monitoring and protection functions into a single

package.

The output voltage of the converter can be precisely

regulated to as low as 0.8V, with a maximum tolerance of

鹵0.5%

over temperature and line voltage variations.

The ISL6522A provides simple, single feedback loop,

voltage-mode control with fast transient response. It includes

a 200kHz free-running triangle-wave oscillator that is

adjustable from below 50kHz to over 1MHz. 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 ratio

ranges from 0鈥?00%.

The ISL6522A protects against overcurrent conditions by

inhibiting PWM operation. The ISL6522A monitors the

current by using the r

DS(ON)

of the upper MOSFET which

eliminates the need for a current sensing resistor.

Features

鈥?Drives two N-Channel MOSFETs

鈥?Operates from +5V or +12V input

鈥?Simple single-loop control design

- Voltage-mode PWM control

鈥?Fast transient response

- High-bandwidth error amplifier

- Full 0-100% duty ratio

鈥?Excellent output voltage regulation

- 0.8V internal reference

-

鹵0.5%

over line voltage and temperature

鈥?Overcurrent fault monitor

- Does not require extra current sensing element

- Uses MOSFETs r

DS(ON)

鈥?Converter can source and sink current

鈥?Small converter size

- Constant frequency operation

- 200kHz free-running oscillator programmable from

50kHz to over 1MHz

鈥?14 Ld SOIC and 16 Lead 5x5mm QFN Packages

鈥?QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat

No Leads-Product Outline.

- Near Chip-Scale Package Footprint; Improves PCB

Efficiency and Thinner in Profile

鈥?Pb-Free Available (RoHS Compliant)

Ordering Information

PART NUMBER*

ISL6522ACB

ISL6522ACBZ

(See Note)

ISL6522ACR

ISL6522ACRZ

(See Note)

TEMP.

RANGE (擄C)

25 to 70

25 to 70

25 to 70

25 to 70

PACKAGE

14 Ld SOIC

14 Ld SOIC

(Pb-free)

16 Ld 5x5 QFN

16 Ld 5x5 QFN

(Pb-free)

PKG.

DWG. #

M14.15

M14.15

L16.5x5B

L16.5x5B

Applications

鈥?Power supply for Pentium

廬

, Pentium Pro, PowerPC

廬

and

AlphaPC鈩?microprocessors

鈥?High-power 5V to 3.xV DC-DC regulators

鈥?Low-voltage distributed power supplies

NOTE: Intersil Pb-free products employ special Pb-free material sets;

molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with

both SnPb and Pb-free soldering operations. Intersil Pb-free products

are MSL classified at Pb-free peak reflow temperatures that meet or

exceed the Pb-free requirements of IPC/JEDEC J STD-020.

*Add 鈥?T鈥?suffix for tape and reel.

1

CCAUTION: 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. 2003-2005. All Rights Reserved.

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

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