Dual Bootstrapped 12 V MOSFET

Driver with Output Disable

ADP3120

Rev. 0

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FEATURES

All-in-one synchronous buck driver

Bootstrapped high-side drive

One PWM signal generates both drives

Anticross-conduction protection circuitry

Output disable control turns off both MOSFETs

to float output per Intel® VRM 10 specification

APPLICATIONS

Multiphase desktop CPU supplies

Single-supply synchronous buck converters

GENERAL DESCRIPTION

The ADP3120 is a dual, high voltage MOSFET driver optimized

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

isolated synchronous buck power converter. Each of the drivers

is capable of driving a 3000 pF load with a 45 ns propagation

delay and a 25 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

ADP3120 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 shutdown.

The ADP3120 is specified over the commercial temperature

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

LFCSP packages.

SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM

2

3

OD

IN

ADP3120

VCC

BST

DRVH

SW

DRVL

PGND

DELAY

VCC

6

DELAY

CMP

CMP

1V

4

1

7

CONTROL

LOGIC

6

5

8

D1

12V

Q1

TO

INDUCTOR

Q2

Figure 1.