REV. 0

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a

ADP3412

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

Dual MOSFET Driver

with Bootstrapping

FUNCTIONAL BLOCK DIAGRAM

VCC

BST

DRVH

SW

DRVL

PGND

IN

DLY

OVERLAP

PROTECTION

CIRCUIT

ADP3412

FEATURES

All-In-One Synchronous Buck Driver

Bootstrapped High-Side Drive

One PWM Signal Generates Both Drives

Programmable Transition Delay

Anticross-Conduction Protection Circuitry

APPLICATIONS

Multiphase Desktop CPU Supplies

Mobile Computing CPU Core Power Converters

Single-Supply Synchronous Buck Converters

Standard-to-Synchronous Converter Adaptations

VCC

BST

DRVH

SW

IN

DRVL

ADP3412

12V

PGND

1V

1V

Q1

Q2

DELAY

5V

DLY

D1

Figure 1. General Application Circuit

GENERAL DESCRIPTION

The ADP3412 is a dual MOSFET driver optimized for driving

two N-channel MOSFETs which are the two switches in a

nonisolated synchronous buck power converter. Each of the

drivers is capable of driving a 3000 pF load with a 20 ns propa-

gation delay and a 30 ns transition time. One of the drivers can

be bootstrapped, and is designed to handle the high-voltage

slew rate associated with “floating” high-side gate drivers. The

ADP3412 includes overlapping drive protection (ODP) to pre-

vent shoot-through current in the external MOSFETs.