ADP3160 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3160

5-Bit Programmable 2-Phase Synchronous Buck Controller

Analog Devices 

a

FEATURES

ADOPT™ Optimal Positioning Technology for Superior

Load Transient Response and Fewest Output Capacitors

Complies with VRM 9.0 with Lowest System Cost

Active Current Balancing between Both Output Phases

5-Bit Digitally Programmable 1.1 V to 1.85 V Output

Dual Logic-Level PWM Outputs for Interface to External

High Power Drivers

Total Output Accuracy ؎0.8% over Temperature

Current-Mode Operation

Short Circuit Protection

Power Good Output

Overvoltage Protection Crowbar Protects

Microprocessors with No Additional

External Components

APPLICATIONS

Desktop PC Power Supplies for:

Intel Pentium® 4 Processors

AMD Athlon™ Processors

VRM Modules

5-Bit Programmable 2-Phase

Synchronous Buck Controller

ADP3160/ADP3167

FUNCTIONAL BLOCK DIAGRAM

VCC

REF

GND

CT

COMP

UVLO

AND

BIAS

3.0V

REFERENCE

SET

RESET

CROWBAR

2-PHASE

DRIVER

LOGIC

CMP3

DAC+24%

OSCILLATOR

CMP

CMP2

DAC–18%

CMP

CMP1

ADP3160/ADP3167

gm

VID

DAC

PWM1

PWM2

PWRGD

CS–

CS+

FB

VID4 VID3 VID2 VID1 VID0

GENERAL DESCRIPTION

The ADP3160 and ADP3167 are highly efficient, dual output,

synchronous buck switching regulator controllers optimized for

converting a 5 V or 12 V main supply into the core supply voltage

required by high-performance processors, such as Pentium 4 and

Athlon. The ADP3160 uses an internal 5-bit DAC to read a volt-

age identification (VID) code directly from the processor that is

used to set the output voltage between 1.1 V and 1.85 V. The

devices use a current-mode PWM architecture to drive two logic-

level outputs at a programmable switching frequency that can be

optimized for VRM size and efficiency. The output signals are

180 degrees out of phase, allowing for the construction of two

complementary buck switching stages. These two stages share the

dc output current to reduce overall output voltage ripple. An

active current balancing function ensures that both phases carry

equal portions of the total load current, even under large transient

loads, to minimize the size of the inductors. The ADP3160 control

ADOPT is a trademark of Analog Devices, Inc.

Athlon is a trademark of Advanced Micro Devices, Inc.

Pentium is a registered trademark of Intel Corporation.

loop has been optimized for conversion from 12 V, while the

ADP3167 is designed for conversion from a 5 V supply.

The ADP3160 and ADP3167 also use a unique supplemental

regulation technique called active voltage positioning to enhance

load transient performance. Active voltage positioning results

in a dc/dc converter that meets the stringent output voltage

specifications for high-performance processors, with the minimum

number of output capacitors and smallest footprint. Unlike

voltage-mode and standard current-mode architectures, active

voltage positioning adjusts the output voltage as a function of

the load current so that it is always optimally positioned for a

system transient. They also provide accurate and reliable short

circuit protection and adjustable current limiting.

The ADP3160 is specified over the commercial temperature

range of 0∞C to 70∞C and is available in a 16-lead narrow body

SOIC package.

REV. B

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 that

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

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

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