1

®

FN4998.3

ISL6525

Buck and Synchronous-Rectifier

Pulse-Width Modulator (PWM) Controller

The ISL6525 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 ISL6525 integrates all of the control, output

adjustment, monitoring and protection functions into a single

package. A programmable delay time for the PGOOD signal

makes it especially suitable for the VTT regulation in VRM8.5

applications.

The output voltage of the converter can be precisely

regulated to as low as 1.20V, with a maximum tolerance of

±1% over temperature and line voltage variations.

The ISL6525 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/

µs slew rate which enables high converter bandwidth for

fast transient performance. The resulting PWM duty ratio

ranges from 0% to 100%.

The ISL6525 protects against over-current conditions by

inhibiting PWM operation. The ISL6525 monitors the current

the need for a current sensing resistor.

Features

• Drives Two N-Channel MOSFETs

• Operates From +5V or +12V Input

• Simple Single-Loop Control Design

- Voltage-Mode PWM Control

• Fast Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Ratio

• Excellent Output Voltage Regulation

- 1.20V Internal Reference

-

±1% Over Line Voltage and Temperature

• Programmable delay for PGOOD signal

• Over-Current Fault Monitor

- Does Not Require Extra Current Sensing Element

• Small Converter Size

- Constant Frequency Operation

- 200kHz Free-Running Oscillator Programmable from

50kHz to Over 1MHz

• 14 Pin, SOIC Package

•

Pb-Free Available (RoHS Compliant)

Applications

• Power Supply for Various Microprocessors

• VTT Regulation for VRM8.5

• High-Power 5V to 3.xV DC-DC Regulators

• Low-Voltage Distributed Power Supplies

Pinout

ISL6525

(SOIC)

TOP VIEW

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

DWG. #

ISL6525CB

0 to 70

14 Ld SOIC

M14.15

ISL6525CBZ

(See Note)

0 to 70

14 Ld SOIC

(Pb-free)

M14.15

*Add “-T” suffix to part number for tape and reel packaging.

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.

8

9

10

11

12

13

14

7

6

5

4

3

2

1

OCSET

SS

GND

COMP

FB

DELAY

LGATE

PGND

BOOT

UGATE

PHASE

VCC

PGOOD

RT

Data Sheet

December 27, 2004

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

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2001, 2004. All Rights Reserved

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