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FAN5029 -- 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
January 2007
FAN5029
8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
Features
* Selectable 2-, 3-, 4-, or 5-phase operation at up to 1MHz per phase * 7.7mV worst-case differential sensing error * Active current balancing between the output phases * Power good and crowbar blanking supports on-thefly VID code changes * Selectable VR10 extended (7-bit) and VR11 (8-bit) VID tables * Programmable short-circuit protection and latch-off delay * Programmable soft start ramp
Description
The FAN5029 is a multi-phase buck switching regulator controller optimized to convert a 12V input supply to the processor core voltage required by highperformance Intel(R) 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. It outputs a PWM to external MOSFET drivers that, in turn, 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-, 3-, 4-, or 5-phase applications. The FAN5029 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 FAN5029 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point. The FAN5029 is specified over the extended commercial temperature range of 0C to +85C and is available in a 40-lead MLP package.
Applications
* Desktop PC/Server processor power supplies for existing and next generation Intel processors * VRM modules products
Part Numbers
* FAN5029MPX is not for new designs. * The FAN5029MPX_NAAC238 replaces the FAN5029MPX and is compatible with all VR10 and VR11 processors.
Ordering Information
Part Number
FAN5029MPX FAN5029MPX_NAAC238 0C to 85C MLP-40
Temperature Range
Package Type
Lead Free
Yes
Packing Method
Quantity per Reel
3,000
Not For New Designs Tape and Reel
For more information, please contact Ron Berthiaume at ronald.berthiaume@fairchildsemi.com.
(c) 2004 Fairchild Semiconductor Corporation FAN5029 Rev. 1.1.3
www.fairchildsemi.com
FAN5029 -- 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
Block Diagram
Figure 1: Block Diagram
(c) 2004 Fairchild Semiconductor Corporation FAN5029 Rev. 1.1.3
www.fairchildsemi.com 2
FAN5029 -- 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
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DISCLAIMER 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. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD'S 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: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only.
Rev. I22
Preliminary
No Identification Needed
Full Production
Obsolete
Not In Production
(c) 2004 Fairchild Semiconductor Corporation FAN5029 Rev. 1.1.3
www.fairchildsemi.com 3

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