FAN50FC3MPX
FAN50FC3MPX Datasheet
FAN50FC3 8-Bit Programmable, 2- to 3-Phase FastvCore Buck Controller
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FAN50FC3MPX |
FAN50FC3MPX (pdf) |
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| FAN50FC3 8-Bit Programmable, 2- to 3-Phase FastvCore Buck Controller June 2007 FAN50FC3 8-Bit Programmable, 2- to 3-Phase FastvCore Buck Controller FastvCore nonlinear control for fast transient and to minimizes the number of output caps required Selectable 2- or 3-phase operation at up to 1MHz per phase ±7.7mV worst-case differential sensing error over temperature Active current balancing between output phases Power Good and Crowbar blanking supports on-the-fly VID code changes 0.5V to 1.6V output Usable for VR10 and VR11 designs Selectable VR10 extended 7-bit and VR11 8-bit VID tables Programmable soft-start ramp Programmable short-circuit protection and latch-off delay Desktop PC/Server processor power supplies for existing and next-generation processors VRM modules Related Applications Notes AN-6052 Instructions for the Multi-Phase VR11 Design Tool The FAN50FC3 device is a multi-phase buck switching regulator controller optimized to convert a 12V input supply to the processor core voltage required by highperformance processors. It has an internal, 8-bit DAC that converts a digital voltage identification VID code sent from the processor, to set the output voltage between 0.5V and 1.6V in 6.25mV steps. It outputs PWM signals to external MOSFET drivers that drive the switching power MOSFETs. The switching frequency of the design is programmable by a single resistor value and the number of phases can be programmed to support 2- or 3-phase applications. The FAN50FC3 also includes programmable no-load offset and droop functions to adjust the output voltage as a function of the load current, as required by the specifications. The FAN50FC3 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point. FastvCore technology greatly improves the fast transient response required by today’s high-performance processors. This allows fewer output capacitors to be used in the application. The FAN50FC3 is specified over the commercial temperature range of 0°C to +85°C and is available in a 32-lead MLP package. Ordering Information Part Number Pb-Free Operating Temperature Range FAN50FC3MPX Yes 0 to 85°C Package 32-Lead, Molded Leadless Package MLP Packing Method Tape and Reel FAN50FC3 8-Bit Programmable, 2- to 3-Phase FastvCore Buck Controller Block Diagram UVLO SHUT DOWN & BIAS Threshold EN DAC + OVP CSREF RAMPADJ OSCILLATOR CURRENT BALANCE CIRCUIT SET EN RESET RESET RESET 2/3 PHASE LOGIC OD PWM1 PWM2 PWM3 DAC - UVP PWRGD DELAY VOSADJ CR OW BAR CURR ENT LIM IT SW1 SW2 SW3 ILIMIT DELAY COMP FBRTN VIDSEL CURRENT LIMIT CIRCUIT PRECISION REFERENCE BOOT CONTROL START UP CONTROL VID DAC DAC BUFF VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 CSCOMP CSREF CSSUM |
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