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FAN5031 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5031 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 3 page ©2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com March 2006 FAN5031 Rev. 1.0.1 FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller Features ■ Selectable 2, 3, or 4 phase operation at up to 1MHz per phase ■ ±7.7mV worst-case differential sensing error over temperature ■ Active current balancing between the output phases ■ Power good and Crowbar blanking supports on-the-fly VID code changes ■ 0.5V to 1.6V output ■ Fully compliant to both Intel’s VR10 and VR11 specifications ■ Selectable VR10 extended (7 bit) and VR11 (8 bit) VID tables ■ Programmable soft start ramp ■ Programmable short circuit protection and latch-off delay Applications ■ Desktop PC/Server processor power supplies for existing and next generation Intel processors ■ VRM modules Description The FAN5031 device is a multi-phase buck switching regulator controller, that is optimized to convert a 12V input supply to the processor core voltage required by high performance Intel processors. It has an internal 8-bit DAC that converts a digital voltage identification (VID) code, that is sent from the processor, to set the output voltage between 0.5V and 1.6V in 6.25 mV steps. It out- puts a PWM signals to external MOSFET drivers that, in turn, drive the switching power MOSFETs. The switching frequency of the design is easily programmable by a single resistor value and the number of phases can be programmed to support 2, 3, or 4 phase applications. The FAN5031 also includes programmable no-load off- set and droop functions to adjust the output voltage as a function of the load current, as required by the Intel spec- ifications. The FAN5031 also provides an accurate and reliable short circuit protection function with an adjust- able over current set-point. The FAN5031 is specified over the commercial tempera- ture range of 0°C to +85°C and is available in a 40-lead MLP package. Ordering Information *Lead free part Part Number Temperature Range Package Type Packing Method Quantity per Reel FAN5031MPX* 0°C to 85°C MLP-40 Tape and Reel 3,000 |
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