FAN5032

FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller

April 2006

FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller
Features
Selectable 2, 3, or 4 phase operation at up to 1MHz

Description
The FAN5032 is a controller for a multi-phase buck switching regulator optimized to convert a 12V input supply to the processor core voltage required by highperformance Intel processors. It has an internal 8-bit digital to analog converter (DAC) that converts a digital voltage identification (VID) code, sent from the processor to set the output voltage between 0.5V and 1.6V in 6.25mV steps. It outputs a pulse-width modulated (PWM) signal 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, or 4 phase applications. The FAN5032 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 FAN5032 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point. The FAN5032 is specified over t
he 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 Intel 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

Special Features
300mV OVP and crowbar threshold

Applications
Desktop PC/server processor power supplies for

existing and next-generation Intel processors VRM modules

Ordering Information
Product Number
FAN5032MPX

Package Type
MLP-40

Pb-Free
Yes

Operating Temperature Range
0 C to 85 C

Packing Meathod
Tape and Reel

Quantity per Reel
3,000

2006 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5032 Rev. 1.0.0