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| FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller December 2005 FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller Features Selectable 2-, 3-, 4-, or 5-phase operation at up to Description The FAN5029 is a highly efficient multi-phase synchronous buck switching regulator controller optimized for converting a 12V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 8-bit DAC to read voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.5V and 1.6V. It uses a multi-mode 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 FAN5029 also includes programmable no-load offset and slope functions to adjust the output voltage as a function of the load current, so that it is always optimally positioned for a system transient. The FAN5029 also provides accurate and reliable short circuit protection, adjustable current limiting, and a delayed Power Good output that accommodates on-the-fly output voltage changes requested by the CPU. FAN5029 is specified over the extended commercial temperature range of 0C to +85C and is available in a 40-lead MLP package. 1 MHz per phase 8 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-thefly VID code changes Digitally programmable 0.5 V to 1.6 V output supports both VR10 and VR11 specifications Programmable short circuit protection with programmable latch-off delay Applications Desktop PC/Server power supplies for next generation Intel processors VRM modules For more information, please contact Ron Berthiaume at ronald.berthiaume@fairchildsemi.com Related Products FAN5109MX - Dual Bootstrapped 12V MOSFET Driver FAN5068 - DDR-1/DDR-2 plus ACPI Regulator Combo FAN5069 - PWM and LDO Controller Combo FAN6520A - Single Synchronous Buck PWM Controller (c)2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FAN5029 Product Brief Rev. 1.0.0 FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller Block Diagram VCC 31 RT 12 RAMPADJ 13 FAN5029 UVLO SHUTDOWN & BIAS GND 18 OSCILLATOR SET EN RESET 30 19 OD + - CMP PWM1 850mV - + + EN 1 CURRENT BALANCING CIRCUIT - + - CMP RESET 29 PWM2 + - DAC+150mV CSREF CMP RESET 2 / 3 / 4 / 5-PHASE DRIVER LOGIC RESET 28 PWM3 + + - + - CMP 27 PWM4 DAC-250mV - CMP RESET 26 PWM5 PWRGD 2 DELAY CROWBAR CURRENT LIMIT 25 SW1 TTSENSE 10 VRHOT 9 VRFAN 8 THERMAL THROTTLING CONTROL 24 SW2 23 SW3 22 SW4 21 SW5 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 2 www.fairchildsemi.com FAN5029 Product Brief Rev. 1.0.0 FAN5029 8-Bit Programmable 2- to 5-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. ACExTM FAST(R) ActiveArrayTM FASTrTM BottomlessTM FPSTM Build it NowTM FRFETTM CoolFETTM GlobalOptoisolatorTM CROSSVOLTTM GTOTM DOMETM HiSeCTM EcoSPARKTM I2CTM E2CMOSTM i-LoTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM DISCLAIMER ISOPLANARTM LittleFETTM MICROCOUPLERTM MicroFETTM MicroPakTM MICROWIRETM MSXTM MSXProTM OCXTM OCXProTM OPTOLOGIC(R) OPTOPLANARTM PACMANTM POPTM Power247TM PowerEdgeTM PowerSaverTM PowerTrench(R) QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM SerDesTM ScalarPumpTM SILENT SWITCHER(R) SMART STARTTM SPMTM StealthTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SyncFETTM TinyLogic(R) TINYOPTOTM TruTranslationTM UHCTM UltraFET(R) UniFETTM VCXTM WireTM FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILDiS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. 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. I17 3 www.fairchildsemi.com FAN5029 Product Brief Rev. 1.0.0 |
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