www.fairchildsemi.com

REV. 1.0.5 7/22/04

Features

• Drives N-channel High-Side and Low-Side MOSFETs in

a synchronous buck configuration

• 12V High-Side and 12V Low-Side Drive

• Internal Adaptive “Shoot-Through” Protection

• Integrated Bootstrap Diode for High-Side Drive

•Fast rise and fall times

• Switching Frequency Up to 500kHz

•OD input for Output Disable – allows for synchronization

with PWM controller

• SOIC-8 Package

•Available in low thermal resistance MLP package

Applications

• Multi-phase VRM/VRD regulators for Microprocessor

Power

• High Current/High Frequency DC/DC Converters

• High Power Modular Supplies

General Description

The FAN5009 is a dual, high frequency MOSFET driver,

specifically designed to drive N-Channel power MOSFETs

in a synchronous-rectified buck converter. These drivers,

combined with a Fairchild Multi-Phase PWM controller and

power MOSFETs, form a complete core voltage regulator

solution for advanced microprocessors.

The FAN5009 drives the upper and lower MOSFET gates of

drive includes an integrated boot diode and requires only an

the FAN5009 have the capacity to efficiently switch power

MOSFETs at frequencies up to 500kHz. The circuit’s

adaptive shoot-through protection prevents the MOSFETs

from conducting simultaneously.

The FAN5009 is rated for operation from 0°C to +85°C and

is available in low-cost SOIC-8 or MLP packages.

Typical Application

Figure 1. Typical Application.

SW

FAN5009

12V

VCC

OVERLAP

PROTECTION

CIRCUIT

6

5

7

8

1

PWM

2

BOOT

VCC

4

Q1

Q2

L1

3

HDRV

LDRV

PGND

OD

FAN5009

Dual Bootstrapped 12V MOSFET Driver