GENERAL DESCRIPTION

The ADP31921 is a highly efficient, multiphase, synchronous buck switching regulator controller optimized for converting a 12 V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 8-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.5 V and 1.6 V.

FEATURES

Selectable 2-, 3-, or 4-phase operation at up to

1 MHz per phase

±7.7 mV worst-case differential sensing error over

temperature

Logic-level PWM outputs for interface to external high

power drivers

Enhanced PWM flex mode for excellent load transient

performance

Active current balancing between all output phases

Built-in power-good/crowbar blanking supports on-the-fly

VID code changes

Digitally programmable 0.5 V to 1.6 V output supports both

VR10.x and VR11 specifications

Programmable short-circuit protection with programmable

latch-off delay

APPLICATIONS

Desktop PC power supplies for Next generation Intel® processors VRM modules