FAN5031MPX

FAN5031MPX Datasheet

FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller

Part	Datasheet
FAN5031MPX	FAN5031MPX (pdf)

PDF Datasheet Preview
FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller March 2006 FAN5031 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 both Intel’s 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 • Desktop PC/Server processor power supplies for existing and next generation Intel processors • VRM modules 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 VID code, that is sent from the processor, to set the output voltage between 0.5V and 1.6V in mV steps. It outputs 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 offset and droop functions to adjust the output voltage as a function of the load current, as required by the Intel The FAN5031 also provides an accurate and reliable short circuit protection function with an adjustable over current set-point. The FAN5031 is over the commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package. Ordering Information Part Number FAN5031MPX* *Lead free part Temperature Range 0°C to 85°C Package Type MLP-40 Packing Method Tape and Reel Quantity per Reel 3,000 2006 Fairchild Semiconductor Corporation FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller FAN5031 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 21 NC CURRENT LIMIT

PDF Datasheet Preview

FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller

March 2006

FAN5031 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 both Intel’s 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
• Desktop PC/Server processor power supplies for existing and next generation Intel processors
• VRM modules

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 VID code, that is sent from the processor, to set the output voltage between 0.5V and 1.6V in mV steps. It outputs 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 offset and droop functions to adjust the output voltage as a function of the load current, as required by the Intel The FAN5031 also provides an accurate and reliable short circuit protection function with an adjustable over current set-point.

The FAN5031 is over the commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package.
Ordering Information

Part Number FAN5031MPX* *Lead free part

Temperature Range
0°C to 85°C

Package Type MLP-40

Packing Method Tape and Reel

Quantity per Reel
3,000
2006 Fairchild Semiconductor Corporation

FAN5031 8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller

FAN5031 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
21 NC

CURRENT LIMIT

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived FAN5031MPX Datasheet file may be downloaded here without warranties.

Datasheet ID: FAN5031MPX 513902