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