ADP3162 Analog Devices, ADP3162 Datasheet

ADP3162

Manufacturer Part Number

ADP3162

Description

5-Bit Programmable 2-Phase Synchronous Buck Controller

Manufacturer

Analog Devices

Datasheet

1.ADP3162.pdf (12 pages)

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ADOPT is a trademark of Analog Devices, Inc.

GENERAL DESCRIPTION

The ADP3162 is a highly efficient dual output 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 processors such as Tualatin. The ADP3162

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 1.05 V and 1.825 V. The ADP3162 uses 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 cur-

rent 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 ADP3162 also uses a unique supplemental regulation tech-

nique 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. The

ADP3162 also provides accurate and reliable short circuit pro-

tection and adjustable current limiting.

The ADP3162 is specified over the commercial temperature

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

SOIC package.

COMP

GND

REF

5-Bit Programmable 2-Phase

Synchronous Buck Controller

OSCILLATOR

REFERENCE

ADP3162

VID3

& BIAS

FUNCTIONAL BLOCK DIAGRAM

UVLO

VCC

3.0V

VID2

CMP1

VID1

DAC

VID

CROWBAR

CMP

RESET

CMP3

CMP2

SET

VID0

CMP

VID25

2-PHASE

DRIVER

ADP3162

LOGIC

DAC+24%

DAC–18%

PWM1

PWM2

PWRGD

CS–

CS+

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