FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller Features Description ■ Selectable 2-, 3-, 4-, or 5-phase operation at up to 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. ■ ■ ■ ■ ■ ■ 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 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. Applications ■ Desktop PC/Server power supplies for next generation Intel processors VRM modules ■ FAN5029 is specified over the extended commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package. For more information, please contact Ron Berthiaume at [email protected] 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 ©2005 Fairchild Semiconductor Corporation FAN5029 Product Brief Rev. 1.0.0 1 www.fairchildsemi.com FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller December 2005 VCC RT RAMPADJ 31 12 13 FAN5029 UVLO SHUTDOWN & BIAS OSCILLATOR GND 18 CMP – CMP – CURRENT BALANCING CIRCUIT + DAC+150mV CSREF CMP – PWM1 RESET 29 PWM2 RESET 28 PWM3 2 / 3 / 4 / 5-PHASE DRIVER LOGIC + CMP – + – RESET 27 PWM4 RESET 26 + CMP – DELAY PWRGD 2 30 + – + DAC-250mV RESET + – EN 1 OD SET EN + 850mV 19 CROWBAR PWM5 CURRENT LIMIT 25 SW1 TTSENSE 10 VRHOT 9 24 SW2 THERMAL THROTTLING CONTROL 23 SW3 22 SW4 VRFAN 8 21 SW5 17 ILIMIT 11 DELAY CURRENT LIMIT CIRCUIT 7 + CSCOMP 15 CSREF – 16 CSSUM Z + 14 LLSET – COMP 5 – + PRECISION REFERENCE FBRTN – 4 FB 6 SS 3 STARTUP CONTROL + Boot Control DAC BUFF VID DAC VIDSEL 40 32 33 34 35 36 37 38 39 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 2 FAN5029 Product Brief Rev. 1.0.0 www.fairchildsemi.com FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller Block Diagram 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. 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PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production 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. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. 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 FAN5029 Product Brief Rev. 1.0.0 www.fairchildsemi.com FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller TRADEMARKS