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LT1336

Half-Bridge N-Channel

Power MOSFET Driver

with Boost Regulator

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Floating Top Driver Switches Up to 60V

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Internal Boost Regulator for DC Operation

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Drives Gate of Top N-Channel MOSFET

above Supply

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180ns Transition Times Driving 10,000pF

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Adaptive Nonoverlapping Gate Drives Prevent

Shoot-Through

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Top Drive Maintained at High Duty Cycles

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TTL/CMOS Input Levels

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Undervoltage Lockout with Hysteresis

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Operates at Supply Voltages from 10V to 15V

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Separate Top and Bottom Drive Pins

The LT

power MOSFET driver. The floating driver can drive the

topside N-channel power MOSFETs operating off a high

voltage (HV) rail of up to 60V (absolute maximum). In

PWM operation an on-chip switching regulator maintains

charge in the bootstrap capacitor even when approaching

and operating at 100% duty cycle.

The internal logic prevents the inputs from turning on the

power MOSFETs in a half-bridge at the same time. Its

unique adaptive protection against shoot-through cur-

rents eliminates all matching requirements for the two

MOSFETs. This greatly eases the design of high efficiency

motor control and switching regulator systems.

During low supply or start-up conditions, the undervoltage

lockout actively pulls the driver outputs low to prevent the

power MOSFETs from being partially turned on. The 0.5V

hysteresis allows reliable operation even with slowly vary-

ing supplies.

FEATURES

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PWM of High Current Inductive Loads

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Half-Bridge and Full-Bridge Motor Control

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Synchronous Step-Down Switching Regulators

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3-Phase Brushless Motor Drive

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High Current Transducer Drivers

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Class D Power Amplifiers

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

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UVOUT

INTOP

INBOTTOM

16

14

13

12

11

9

8

1

2

10

5

3

4

SWITCH

BOOST

TGATEDR

TGATEFB

TSOURCE

BGATEDR

BGATEFB

LT1336

1N4148

200

µH*

HV = 40V MAX**

1

µF

10

µF

25V

12V

PWM

0Hz TO 100kHz

1336 TA01

IRFZ44

IRFZ44

615

7

1000

µF

100V

SGND

PGND

SWGND

1N4148

2

Ω

1/4W

*SUMIDA RCR-664D-221KC

**FOR HV > 40V SEE “DERIVING THE FLOATING

SUPPLY WITH THE FLYBACK TOPOLOGY” IN

APPLICATIONS INFORMATION SECTION

INTOP INBOTTOM TGATEDR

BGATEDR

L

L

L

L

L

H

L

H

H

L

H

L

H

H

L

L