LTC4442/LTC4442-1

1

4442fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

High Speed Synchronous

N-Channel MOSFET Drivers

The LTC

to drive two N-channel MOSFETs in a synchronous buck

DC/DC converter topology. The powerful driver capabil-

ity reduces switching losses in MOSFETs with high gate

capacitance.

The LTC4442 features a separate supply for the input

logic to match the signal swing of the controller IC. If the

input signal is not being driven, the LTC4442 activates a

shutdown mode that turns off both external MOSFETs.

The input logic signal is internally level-shifted to the

bootstrapped supply, which may function at up to 42V

above ground.

The LTC4442 contains undervoltage lockout circuits on

both the driver and logic supplies that turn off the external

MOSFETs when an undervoltage condition is present.

The LTC4442 and LTC4442-1 have different undervoltage

lockout thresholds to accommodate a wide variety of ap-

plications. An adaptive shoot-through protection feature is

also built-in to prevent power loss resulting from MOSFET

cross-conduction current.

The LTC4442/LTC4442-1 are available in the thermally

enhanced 8-lead MSOP package.

Synchronous Buck Converter Driver

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38V Maximum Input Supply Voltage

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Adaptive Shoot-Through Protection

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2.4A Peak Pull-Up Current

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5A Peak Pull-Down Current

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8ns TG Fall Time Driving 3000pF Load

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12ns TG Rise Time Driving 3000pF Load

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Separate Supply to Match PWM Controller

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Drives Dual N-Channel MOSFETs

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Undervoltage Lockout

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Thermally Enhanced MSOP Package

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Distributed Power Architectures

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High Density Power Modules

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

LTC4442 Driving 3000pF Capacitive Loads

TG

BOOST

32V

GND

TS

LTC4442

BG

PWM

6V

IN

4442 TA01a

INPUT (IN)

5V/DIV

BOTTOM

GATE (BG)

5V/DIV

TOP GATE

(TG-TS)

5V/DIV

10ns/DIV

4442 TA01b