FAN5029

FAN5029 -- 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller

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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 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 0 C to 85 C and is avail
able 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 0 C to 85 C 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.

2004 Fairchild Semiconductor Corporation FAN5029 Rev. 1.1.3

www.fairchildsemi.com