Part # FAN5031 datasheet

Part Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor

Part Description:

Part Details:

FAN5031 8-Bit Pr March 2006 FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck ogrammab Controller Features Description Selectable 2, 3, or 4 phase operation at up to 1MHz The FAN5031 device is a multi-phase buck switching per phase regulator controller, that is optimized to convert a 12V le input supply to the processor core voltage required by , ±7.7mV worst-case differential sensing error over 2 to 4 Phase temperature high performance Intel processors. It has an internal 8-bit Active current balancing between the output phases DAC that converts a digital voltage identification (VID)code, that is sent from the processor, to set the output Power good and Crowbar blanking supports on-the-fly voltage between 0.5V and 1.6V in 6.25 mV steps. It out- VID code changes puts a PWM signals to external MOSFET drivers that, in 0.5V to 1.6V output turn, drive the switching power MOSFETs. The switching Fully compliant to both Intel s VR10 and VR11 , frequency of the design is easily programmable by a Sync specifications single resistor value and the number of phases can be Selectable VR10 extended (7 bit) and VR11 (8 bit) programmed to support 2, 3, or 4 phase applications. VID tables hr The FAN5031 also includes programmable no-load off- onous Buc Programmable soft start ramp set and droop functions to adjust the output voltage as a Programmable short circuit protection and latch-off function of the load current, as required by the Intel spec- delay ifications. The FAN5031 also provides an accurate andreliable short circuit protection function with an adjust- Applications able over current set-point. k Contr Desktop PC/Server processor power supplies for The FAN5031 is specified over the commercial tempera- existing and next generation Intel processors ture range of 0°C to +85°C and is available in a 40-lead VRM modules MLP package.

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FAN5031.pdf Datasheet