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ADP3152AR

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor

Analog Devices 

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FEATURES

5-Bit Digitally Programmable 1.8 V to 3.5 V Output

Voltage

Dual N-Channel Synchronous Driver

Total Output Accuracy ؎1% (0؇C to 70؇C)

High Efficiency

Current-Mode Operation

Short Circuit Protection

Power Good Output

Integrated Overvoltage Protection Crowbar

16-Lead SOIC Package

VRM 8.2 Compatible

APPLICATIONS

Desktop PC Power Supply for:

Pentium II Processor

Pentium Pro Processor

Pentium Processor

AMD–K6 Processor

VRM Modules

5-Bit Programmable Synchronous

Switching Regulator Controller

for Pentium® II Processor

ADP3152

GENERAL DESCRIPTION

The ADP3152 is a highly efficient synchronous switching regu-

lator controller optimized for Pentium II Processor applications

where 5 V is stepped down to a digitally controlled output volt-

age between 1.8 V and 3.5 V. Using a 5-bit DAC to read a

voltage identification (VID) code directly from the processor,

the ADP3152 uses a current mode constant off-time architec-

ture to generate its precise output voltage.

The ADP3152 drives two N-channel MOSFETS in a synchro-

nous rectified buck converter, at a maximum switching fre-

quency of 250 kHz. Using the recommended loop compensation

and guidelines, the ADP3152 provides a dc/dc converter that

meets Intel’s stringent transient specifications with a minimum

number of output capacitors and smallest footprint. Additionally,

the current mode architecture also provides guaranteed short

circuit protection and adjustable current limiting.

VCC

VIN

+12V

+5V

22␮F

R1

1␮F

VCC

SD

DRIVE1

ADP3152

IRL3103

CMP

SENSE+

R2

CCOMP

1nF

CT

SENSE–

150pF

AGND

DRIVE2

PGND

IRL3103

VID0–VID4

+ CIN

L

2.5␮H

RSENSE

6.7m⍀

10BQ015

+ CO

VO

1.8V–3.5V

14A

5-BIT CODE

Figure 1. Typical Application

Pentium is a registered trademark of Intel Corporation.

All other trademarks are the property of their respective holders.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1998

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