FAN5031MPX datasheet(1/3 Pages) FAIRCHILD

Part #	FAN5031MPX

Description	8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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March 2006

FAN5031 Rev. 1.0.1

FAN5031

8-Bit Programmable, 2 to 4 Phase, Synchronous Buck

Controller

Features

■ Selectable 2, 3, or 4 phase operation at up to 1MHz

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 both Intel’s 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

Applications

■ Desktop PC/Server processor power supplies for

existing and next generation Intel processors

■ VRM modules

Description

The FAN5031 device is a multi-phase buck switching

regulator controller, that is optimized to convert a 12V

input supply to the processor core voltage required by

high performance 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 in 6.25 mV steps. It out-

puts a PWM signals to external MOSFET drivers that, in

turn, drive the switching power MOSFETs. The switching

frequency of the design is easily programmable by a

single resistor value and the number of phases can be

programmed to support 2, 3, or 4 phase applications.

The FAN5031 also includes programmable no-load off-

set and droop functions to adjust the output voltage as a

function of the load current, as required by the Intel spec-

iﬁcations. The FAN5031 also provides an accurate and

reliable short circuit protection function with an adjust-

able over current set-point.

The FAN5031 is speciﬁed over the commercial tempera-

ture range of 0°C to +85°C and is available in a 40-lead

MLP package.

Ordering Information

*Lead free part

Part Number

Temperature

Range

Package Type

Packing Method

Quantity per

Reel

FAN5031MPX*

0°C to 85°C

MLP-40

Tape and Reel

3,000

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