GENERAL DESCRIPTION

The ADP31941 is a highly efficient, multiphase, synchronous buck switching regulator controller optimized for converting a 5 V or 12 V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 6-bit DAC to read a voltage identification (VID) code directly from the processor that is used to set the output voltage between 0.8375 V and 1.6 V. The device 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 relationship of the output signals can be programmed to provide 2-, 3-, or 4-phase operation, allowing for the construction of up to four complementary buck switching stages.

FEATURES

Selectable 2-, 3-, or 4-phase operation

Up to 1 MHz per phase

±9.5 mV worst-case differential sensing error

over temperature

Logic-level PWM outputs for interface to external

high power drivers

PWM Flex-ModeTM architecture for excellent load

transient performance

Active current balancing between all output phases

Built-in power good/crowbar blanking supports OTF VID

code changes

6-bit digitally programmable 0.8375 V to 1.6 V output

Programmable short circuit protection with programmable

latch-off delay

APPLICATIONS

Desktop PC power supplies for

Next-generation Intel® processors

VRM modules

Games consoles