GENERAL DESCRIPTION

The ADP31961 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 Advanced Micro Devices, Inc. (AMD) processors. It uses an internal 6-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.3750 V and 1.55 V.

FEATURES

Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase

±10 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 0.3750 V to 1.55 V output

Programmable short-circuit protection with programmable latch-off delay

APPLICATIONS

Desktop PC power supplies for next generation

AMD processors

VRM modules