ADP3163 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3163

5-Bit Programmable 2-Phase Synchronous Buck Controller

Analog Devices 

a

5-Bit Programmable 2-/3-Phase

Synchronous Buck Controller

ADP3163

FEATURES

ADOPT™ Optimal Positioning Technology for Superior

Load Transient Response and Fewest Output

Capacitors

Complies with VRM 9.0 and Intel VR Down Guideline

with Lowest System Cost

Digitally Selectable 2- or 3-Phase Operation

at up to 500 kHz per Phase

Quad Logic-level PWM Outputs for Interface to

External High-Power Drivers

Active Current Balancing between All Output Phases

Accurate Multiple VRM Module Current Sharing

5-Bit Digitally Programmable 1.1 V to 1.85 V Output

Total Output Accuracy ؎0.8% Over Temperature

Current-Mode Operation

Short Circuit Protection

Enhanced Power Good Output Detects Open Outputs in

Multi-VRM Power Systems

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

REF

GND

FUNCTIONAL BLOCK DIAGRAM

VCC

UVLO

& BIAS

3.0V

REFERENCE

ADP3163

SET

RESET

CROWBAR

PC

2-/3-PHASE

DRIVER

LOGIC

DAC+20%

CT

OSCILLATOR

SHARE

COMP

SOFT

START

POWER

GOOD

CMP

CMP

DAC+20%

gm

VID

DAC

PWM1

PWM2

PWM3

PGND

PWRGD

CS–

CS+

FB

GENERAL DESCRIPTION

The ADP3163 is a highly efficient multiphase synchronous buck

switching regulator controller optimized for converting a 5 V or

12 V main supply into the core supply voltage required by high

performance Intel processors. The ADP3163 uses an internal

5-bit DAC to read a voltage identification (VID) code directly

from the processor, which is used to set the output voltage between

1.1 V and 1.85 V. The ADP3163 uses a current mode PWM

architecture to drive the logic-level outputs at a programmable

switching frequency that can be optimized for VRM size and

efficiency. The phase relationship of the output signals can be

programmed to provide 2- or 3-phase operation, allowing for

the construction of up to three complementary buck switching

stages. These stages share the dc output current to reduce

overall output voltage ripple. An active current balancing func-

tion ensures that all phases carry equal portions of the total load

current, even under large transient loads, to minimize the size of

the inductors.

VID4 VID3 VID2 VID1 VID0

The ADP3163 also uses a unique supplemental regulation tech-

nique called active voltage positioning (ADOPT) to enhance

load transient performance. Active voltage positioning results in

a dc/dc converter that meets the stringent output voltage specifi-

cations 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. The ADP3163 also provides accurate and

reliable short circuit protection, adjustable current limiting, and

an enhanced Power Good output that can detect open outputs

in any phase for single or multi-VRM systems.

The ADP3163 is specified over the commercial temperature

range of 0°C to 70°C and is available in a 20-lead TSSOP package.

ADOPT is a trademark of Analog Devices, Inc.

Pentium is a registered trademark of Intel Corporation.

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 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., 2001

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