Dual Bootstrapped 12 V MOSFET

Driver with Output Disable

ADP3418

Rev. B

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FEATURES

All-in-one synchronous buck driver

Bootstrapped high-side drive

1 PWM signal generates both drives

Anticross-conduction protection circuitry

Output disable control turns off both MOSFETs to float the

output per Intel® VRM 10 and AMD Opteron specifications

APPLICATIONS

Multiphase desktop CPU supplies

Single-supply synchronous buck converters

GENERAL DESCRIPTION

The ADP3418 is a dual, high voltage MOSFET driver optimized

for driving two N-channel MOSFETs, the two switches in a

nonisolated, synchronous, buck power converter. Each of the

drivers is capable of driving a 3000 pF load with 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 ADP3418 includes overlapping drive

protection to prevent shoot-through current in the external

MOSFETs. The OD pin shuts off both the high-side and the

low-side MOSFETs to prevent rapid output capacitor discharge

during system shutdowns.

The ADP3418 is specified over the commercial temperature

range of 0°C to 85°C, and is available in an 8-lead SOIC

package.

FUNCTIONAL BLOCK DIAGRAM

R

SQ

Q

CMP

1V

VCC

6

DELAY

DELAY

5

7

CMP

2

3

OD

4

ADP3418

BST

VCC

DRVH

SW

DRVL

PGND

IN

6

1

8

D1

TO

INDUCTOR

Q1

Q2

12V

Figure 1.