GENERAL DESCRIPTION

The ADP3186 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 AMD processors. It 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 0.8 V and 1.55 V. It uses a multimode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The phase relation ship of the output signals can be programmed to provide 2-, 3-, or 4-phase operation, allowing the construction of up to four complementary buck switching stages.

FEATURES

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

±1 worst-case differential sensing error over temperature

Logic-level PWM outputs for interface to external high power drivers

Active current balancing between all output phases

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

5-bit digitally programmable 0.8 V to 1.55 V output

Programmable short-circuit protection with programmable latch-off delay

APPLICATIONS

Desktop PC power supplies for AMD Opteron™ processors VRM modules