FAN5031MPX

FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller March 2006 FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller Features ■ Selectable 2, 3, or 4 phase operation at up to 1MHz ■ ■ ■ ■ ■ ■ ■ ■ 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 outputs 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 offset and droop functions to adjust the output voltage as a function of the load current, as required by the Intel specifications. The FAN5031 also provides an accurate and reliable short circuit protection function with an adjustable over current set-point. The FAN5031 is specified over the commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package. 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 Ordering Information Part Number FAN5031MPX* *Lead free part Temperature Range 0°C to 85°C Package Type MLP-40 Packing Method Tape and Reel Quantity per Reel 3,000 ©2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FAN5031 Rev. 1.0.1 FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller FAN5031 Block Diagram VCC 31 RT 12 RAMPADJ 13 UVLO SHUTDOWN & BIAS GND 18 OSCILLATOR SET EN RESET 19 OD + – CMP 30 PWM1 850mV – + + EN 1 CURRENT BALANCING CIRCUIT – + – CMP RESET 29 PWM2 + – DAC+150mV CSREF CMP RESET 28 PWM3 + + – CMP RESET 27 PWM4 DAC-250mV – 2 / 3 / 4-PHASE DRIVER LOGIC 26 NC PWRGD 2 DELAY CROWBAR CURRENT LIMIT 25 SW1 TTSENSE 10 VRHOT 9 VRFAN 8 THERMAL THROTTLING CONTROL 24 SW2 23 SW3 22 SW4 21 NC 17 CSCOMP ILIMIT 11 DELAY 7 CURRENT LIMIT CIRCUIT + – 15 CSREF 16 CSSUM Z + 14 LLSET COMP 5 – – + – 4 PRECISION REFERENCE FBRTN 3 FB STARTUP CONTROL Boot Control + VIDSEL 40 32 33 34 VID DAC DAC BUFF 6 SS 35 36 37 38 39 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Figure 1. Block Diagram 2 FAN5031 Rev. 1.0.1 www.fairchildsemi.com FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx™ FAST® ActiveArray™ FASTr™ Bottomless™ FPS™ Build it Now™ FRFET™ CoolFET™ GlobalOptoisolator™ CROSSVOLT™ GTO™ DOME™ HiSeC™ EcoSPARK™ I2C™ E2CMOS™ i-Lo™ EnSigna™ ImpliedDisconnect™ FACT™ IntelliMAX™ FACT Quiet Series™ Across the board. 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PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Preliminary First Production No Identification Needed Full Production Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I18 3 FAN5031 Rev. 1.0.1 www.fairchildsemi.com