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ISL6529

Dual Regulator–Synchronous Rectified Buck PWM and Linear Power Controllers

Renesas Electronics 

DATASHEET NOT RECOMMENDED FOR NEW DESIGNS

NO RECOMMENDED REPLACEMENT

contact our Technical Support Center at

ISL6529, ISL6529A

1-888-INTERSIL or www.intersil.com/tsc

FN9070

Dual Regulator–Synchronous Rectified Buck PWM and Linear Power Controllers

Rev 5.00

Apr 12, 2005

The ISL6529, ISL6529A provide the power control and

protection for two output voltages in high-performance

graphics cards and other embedded processor applications.

The dual-output controllers drive two N-Channel MOSFETs

in a synchronous rectified buck converter topology and one

N-Channel MOSFET in a linear configuration. The ISL6529,

ISL6529A provide both a regulated high current, low voltage

supply and an independent, lower current supply integrated

in a 14-lead SOIC package. The controllers are ideal for

graphic card applications where regulation of both the

graphics processing unit (GPU) and memory supplies is

required.

The synchronous rectified buck converters incorporate

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 51.5% of the nominal output level, both

converters are shut down.

Ordering Information

TEMP.

PART NUMBER* RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6529ACB

0 to 70 14 Ld SOIC

M14.15

ISL6529ACBZ (Note) 0 to 70 14 Ld SOIC (Pb-free) M14.15

ISL6529ACR

0 to 70 16 Ld 5x5 QFN

L16.5x5B

ISL6529ACRZ (Note) 0 to 70 16 Ld 5x5 QFN

(Pb-free)

L16.5x5B

ISL6529CB

0 to 70 14 Ld SOIC

M14.15

ISL6529CBZ (Note) 0 to 70 14 Ld SOIC (Pb-free) M14.15

ISL6529CR

0 to 70 16 Ld 5x5 QFN

L16.5x5B

ISL6529CRZ (Note)

0 to 70 16 Ld 5x5 QFN

(Pb-free)

L16.5x5B

ISL6529EVAL1

Evaluation Board

*Add “-T” suffix for tape and reel.

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.

Features

• Provides two regulated voltages

- One synchronous rectified buck PWM controller

- One linear controller

• Both controllers drive low cost N-Channel MOSFETs

• 12V direct drive saves external components

• Small converter size

- 600kHz constant frequency operation

- Small external component count

• Excellent output voltage regulation

- Both outputs: ±1% over temperature - ISL6529AC

- Both outputs: ±2% over temperature - ISL6529C

• 5V down conversion

• PWM and linear output voltage range: down to 0.8V

• 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 N-Channel MOSFET pass transistor

• Fully-adjustable outputs

• Undervoltage fault monitoring on both outputs

• 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

• Pb-Free Available (RoHS Compliant)

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)

FN9070 Rev 5.00

Apr 12, 2005

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