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FAN5032

Part Number	FAN5032
Manufacturer	Fairchild Semiconductor
Description	8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller
Published	May 3, 2007
Detailed Description	FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller April 2006 FAN5032 8-Bit Programmable 2 to 4 Phase...
Datasheet	FAN5032 PDF File

Overview

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.
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 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 www.
DataSheet4U.
com reliable short-circuit protection function with an adjustable over-current set point.
The FAN5032 is speciﬁed over the commercial temperature range of 0°C to 85°C 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 Ordering Information Product Number F...

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