FAN5091 Fairchild Semiconductor, FAN5091 Datasheet

FAN5091

Manufacturer Part Number

FAN5091

Description

Two Slice Interleaved Synchronous Buck Converter

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5091.pdf (21 pages)

Available stocks

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Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5091MTC

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

FAN5091MTCX

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Company:

Meier Automation Equipment Co., Limited

Part Number:

FAN5091MTCX

Manufacturer:

FAIRCHILD/仙童

Quantity:

20 000

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Features

• Programmable output from 1.10V to 1.85V in 25mV steps

• Two interleaved synchronous slices for maximum

• 100nsec response time

• Built-in current sharing between slices

• Remote sense

• Programmable Active Droop (Voltage Positioning)

• Programmable frequency from 200KHz to 2MHz

• Adaptive delay gate switching

• Integrated high-current gate drivers

• Integrated Power Good, OV, UV, Enable/Soft Start

• Drives N-channel MOSFETs

• Operation optimized for 5V operation

• High efﬁciency mode (E*) at light load

• Overcurrent protection using MOSFET sensing

• 24 pin TSSOP package

Applications

• Power supply for Pentium IV

• Power supply for Athlon

• VRM for Pentium IV processor

• Programmable step-down power supply

Block Diagram

Pentium is a registered trademark of Intel Corporation. Athlon is a registered trademark of AMD. Programmable Active Droop is a trademark of Fairchild Semiconductor.

FAN5091

Two Slice Interleaved Synchronous Buck Converter

using an integrated 5-bit DAC

performance

functions

OSC

VID0

VID1

2 3

5-Bit

DAC

VID2

VID3

4 5

VID4

PWRGD

Power

Good

Bypass

DROOP/E*

5V Reg

GNDA

+12V

ENABLE/SS

Control

Digital

Description

The FAN5091 is a synchronous multi-slice DC-DC controller

IC which provides a highly accurate, programmable output

voltage for all high-performance processors. Two interleaved

synchronous buck regulator slices with built-in current shar-

ing operate 180° out of phase to provide the fast transient

response needed to satisfy high current applications while

minimizing external components. The FAN5091 features

remote voltage sensing and Programmable Active Droop

for 100nsec converter transient response with minimum out-

put capacitance. It has integrated high-current gate drivers,

with adaptive delay gate switching, eliminating the need for

external drive devices. The FAN5091 uses a 5-bit D/A con-

verter to program the output voltage from 1.10V to 1.85V in

25mV steps with an accuracy of 1%. The FAN5091 uses a

high level of integration to deliver load currents in excess of

50A from a 5V source with minimal external circuitry. The

FAN5091 also offers integrated functions including Power

Good, Output Enable/Soft Start, under- voltage lockout,

over-voltage protection, and adjustable current limiting with

independent current sense on each slice. It is available in a

24 pin TSSOP package.

ILIM

+12V

www.fairchildsemi.com

+5V

REV. 1.0.0 5/10/01

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