ADP3152AR Analog Devices, ADP3152AR Datasheet

ADP3152AR

Manufacturer Part Number

ADP3152AR

Description

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

Manufacturer

Analog Devices

Datasheet

1.ADP3152AR.pdf (12 pages)

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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.

FEATURES

5-Bit Digitally Programmable 1.8 V to 3.5 V Output

Dual N-Channel Synchronous Driver

Total Output Accuracy

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:

VRM Modules

Voltage

Pentium II Processor

Pentium Pro Processor

Pentium Processor

AMD–K6 Processor

1% (0 C to 70 C)

22 F

COMP

150pF

1 F

AGND

CMP

5-BIT CODE

ADP3152

VID0–VID4

+12V

Figure 1. Typical Application

SENSE+

SENSE–

DRIVE1

DRIVE2

PGND

IRL3103

1nF

5-Bit Programmable Synchronous

+5V

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

Tel: 781/329-4700

Fax: 781/326-8703

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.

Switching Regulator Controller

10BQ015

2.5 H

for Pentium

6.7m

SENSE

World Wide Web Site: http://www.analog.com

1.8V–3.5V

14A

II Processor

ADP3152

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