FAN5094 データシートの表示（PDF） - Fairchild Semiconductor

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FAN5094

Multi-Phase Interleaved Buck Converter

Fairchild Semiconductor 

www.fairchildsemi.com

FAN5094

Multi-Phase Interleaved Buck Converter

Features

• Programmable output from 1.100V to 1.850V in 25mV

steps using an integrated 5-bit DAC

• Two interleaved synchronous phases per IC for maximum

performance

• Up to 4 phase power system

• Built-in current sharing between phases and between ICs

• Frequency and phase synchronization between ICs

• Remote sense and Programmable Active Droop™

• High precision voltage reference

• High speed transient response

• Programmable frequency from 200KHz to 2MHz

• Adaptive delay gate switching

• Integrated high-current gate drivers

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

functions

• Drives N-channel MOSFETs

• Operation optimized for 12V operation

• High efficiency mode at light load

• Overcurrent protection using MOSFET sensing

• 28 pin TSSOP package

Applications

• Power supply for Pentium®IV

• Power supply for Athlon®

• Power supply for Ultrasparc™

• VRM for Pentium IV processor

• Programmable step-down power supply

Block Diagram

+12V

VFB

Description

The FAN5094 is a synchronous multi-phase DC-DC

controller IC which provides a highly accurate,

programmable output voltage for all high-performance

processors. Two interleaved synchronous buck regulator

phases with built-in current sharing operate 180° out of

phase to provide the fast transient response needed to satisfy

high current applications while minimizing external

components. FAN5094s can be paralleled while maintaining

both frequency and phase synchronization and ensuring

current sharing in a high-power system. The FAN5094

features remote voltage sensing, Programmable Active

Droop and advanced response for optimal converter

transient response with minimum output capacitance. It has

integrated high-current gate drivers with adaptive delay gate

switching, eliminating the need for external drive devices.

These make it possible to create power supplies running at a

switching frequency as high as 4MHz, for ultra-high density.

The FAN5094 uses a 5-bit D/A converter to program the

output voltage from 1.100V to 1.850V in 25mV steps with

an accuracy of 0.5%. The FAN5094 uses a high level of

integration to deliver load currents in excess of 150A from a

12V source with minimal external circuitry. The FAN5094

also offers integrated functions including Power Good,

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

voltage protection, and current limiting with independent

current sense on each phase. It is available in a 28-pin

TSSOP package.

FAN5094

+

PHASE

CLK ISHR

CLK ISHR

PHASE

+12V

+12V

FAN5094

+12V

VFB

+

Processor

VFB

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

REV. 1.0.2 5/13/02

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