1

®

FN9038.3

ISL6528

Dual Regulator - Standard Buck PWM

and Linear Power Controller

The ISL6528 provides the power control and protection for

two output voltages in high-performance graphics cards and

other embedded processor applications. The dual-output

controller drives an N-Channel MOSFET in a standard buck

topology and a NPN pass transistor in a linear configuration.

The ISL6528 provides both a regulated high current, low

voltage supply and an independent, lower current supply

integrated in an 8-lead SOIC package. The controller is ideal

for graphics card applications where both graphics

processing unit (GPU) and memory supplies are required.

The standard buck converter is a simple, single feedback

loop, voltage-mode control with fast transient response. Both

the switching regulator and linear regulator provide a

maximum static regulation tolerance of ±2% over line, load,

and temperature ranges. Each output is user-adjustable by

means of external resistors.

An integrated soft-start feature brings both supplies into

regulation in a controlled manner. Each output is monitored

via the FB pins for undervoltage events. If either output

drops below 52.5% of the internal reference voltage, both

regulators are shutdown.

Features

• Pb-Free Available (RoHS Compliant)

• Provides two regulated voltages

- One standard buck PWM

- One linear controller

• Small converter size

- 600kHz constant frequency operation

- Small external component count

• Excellent output voltage regulation

- Both outputs: ±2% over temperature

• Single 5V bias and bootstrap supply

• Output voltage range: 0.8V to 3.3V

• Simple single-loop voltage-mode PWM control design

• Fast PWM converter transient response

- High-bandwidth error amplifier

- Full 0–100% duty ratio

• Linear controller drives bipolar linear pass transistor

• Fully-adjustable outputs

• Undervoltage fault monitoring on both outputs

Applications

• Graphics–GPU and memory supplies

• ASIC power supplies

• Embedded processor and I/O supplies

• DSP supplies

Related Literature

• Technical Brief TB363 Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)

Pinout

ISL6528

(SOIC)

TOP VIEW

Ordering Information

PACKAGE

PKG.

DWG. #

ISL6528CB

0 to 70

8 Ld SOIC

M8.15

ISL6528CB-T

8Ld SOIC Tape and Reel

ISL6528CBZ

(See Note)

0 to 70

8 Ld SOIC

(Pb-free)

M8.15

ISL6528CBZ-T

(See Note)

8Ld SOIC Tape and Reel (Pb-free)

ISL6528EVAL1

Evaluation Board

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.

GND

VCC

DRIVE2

FB2

UGATE

FB

COMP

BOOT

8

7

6

5

1

2

3

4

Data Sheet

December 28, 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. 2004. All Rights Reserved

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