ADP3163 Analog Devices, ADP3163 Datasheet

ADP3163

Manufacturer Part Number

ADP3163

Description

5-Bit Programmable 2-/3-Phase Synchronous Buck Controller

Manufacturer

Analog Devices

Datasheet

1.ADP3163.pdf (16 pages)

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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.

ADOPT is a trademark of Analog Devices, Inc.

Pentium is a registered trademark of Intel Corporation.

5-Bit Programmable 2-/3-Phase

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.

COMP

GND

REF

Synchronous Buck Controller

START

SOFT

OSCILLATOR

REFERENCE

FUNCTIONAL BLOCK DIAGRAM

& BIAS

UVLO

VCC

3.0V

VID4 VID3 VID2 VID1

ADP3163

CROWBAR

DAC

CMP

VID

RESET

SET

CMP

VID0

2-/3-PHASE

ADP3163

DRIVER

LOGIC

POWER

DAC+20%

GOOD

DAC+20%

PWM1

PWM2

PWM3

PGND

PWRGD

CS–

CS+

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