GENERAL DESCRIPTION

The ADP31971is 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, AMD processors. It uses an internal 6-bit digital-to-analog converter (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. It use a multimode pulse-width modulation (PWM) architecture to drive the logic level outputs at a programmable switching frequency that can be optimized for VR size and efficiency

FEATURES

Selectable 2-phase and 3-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 that 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 Voltage regulator modules (VRM)