FAN5032MPX

FAN5032MPX Datasheet

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

Part	Datasheet
FAN5032MPX	FAN5032MPX (pdf)

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FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller April 2006 FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller • 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 VID code changes • 0.5V to 1.6V output • Fully compliant to VR10 and VR11 • 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 • Desktop PC/server processor power supplies for existing and next-generation Intel processors • VRM modules 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 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 The FAN5032 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point. The FAN5032 is over the commercial temperature range of 0°C to 85°C and is available in a 40-lead MLP package. 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 FAN5032 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller FAN5032 Block Diagram GND 18 UVLO SHUTDOWN & BIAS 850mV DAC+150mV CSREF DAC-250mV PWRGD 2 DELAY TTSENSE 10 VRHOT 9 VRFAN 8 THERMAL THROTTLING CONTROL ILIMIT 11 DELAY 7 RT RAMPADJ OSCILLATOR CURRENT BALANCING CIRCUIT SET EN RESET RESET 19 OD 30 PWM1 29 PWM2 28 PWM3 27 PWM4 2 / 3 / 4-PHASE DRIVER LOGIC 26 NC CROWBAR CURRENT LIMIT 25 SW1 24 SW2 23 SW3 22 SW4

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

April 2006

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

VID code changes
• 0.5V to 1.6V output
• Fully compliant to VR10 and VR11
• 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
• Desktop PC/server processor power supplies for existing and next-generation Intel processors
• VRM modules

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 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 The FAN5032 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point.

The FAN5032 is over the commercial temperature range of 0°C to 85°C and is available in a 40-lead MLP package.
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

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

FAN5032 Block Diagram

GND 18

UVLO SHUTDOWN
& BIAS
850mV

DAC+150mV

CSREF

DAC-250mV

PWRGD 2

DELAY

TTSENSE 10 VRHOT 9 VRFAN 8

THERMAL THROTTLING

CONTROL

ILIMIT 11 DELAY 7

RT RAMPADJ

OSCILLATOR

CURRENT BALANCING

CIRCUIT

SET EN RESET

RESET
19 OD 30 PWM1 29 PWM2 28 PWM3 27 PWM4
2 / 3 / 4-PHASE DRIVER LOGIC
26 NC

CROWBAR

CURRENT LIMIT
25 SW1
24 SW2
23 SW3
22 SW4

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Datasheet ID: FAN5032MPX 513903