Product Descriptions

The ADP31891 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.

This 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-,  4-, or 5-phase operation, allowing for the construction of up to  five complementary buck switching stages.

The ADP3189 also includes programmable no load offset and  slope functions to adjust the output voltage as a function of the  load current, optimally positioning it for a system transient. The  ADP3189 also provides accurate and reliable short-circuit  protection, adjustable current limiting, and a delayed powergood output that accommodates on-the-fly output voltage  changes requested by the CPU.

The ADP3189 is specified over the extended commercial  temperature range of 0°C to 85°C and is available in a  40-lead LFCSP.

Product Features

Selectable 2-, 3-, 4-, or 5-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  

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

Product Applications

Desktop PC power supplies for  

Next generation Intel® processors  

VRM modules

Product Specifications

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