LM5107

100V / 1.4A Peak Half Bridge Gate Driver

General Description

The LM5107 is a low cost high voltage gate driver, designed

to drive both the high side and the low side N-Channel

MOSFETs in a synchronous buck or a half bridge configura-

tion. The floating high-side driver is capable of working with

rail voltages up to 100V. The outputs are independently

controlled with TTL compatible input thresholds. An inte-

grated on chip high voltage diode is provided to charge the

high side gate drive bootstrap capacitor. A robust level shifter

technology operates at high speed while consuming low

power and providing clean level transitions from the control

input logic to the high side gate driver. Under-voltage lockout

is provided on both the low side and the high side power

rails. The device is available in the SOIC-8 and the thermally

enhanced LLP-8 packages.

Features

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Drives both a high side and low side N-Channel

MOSFET

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High peak output current (1.4A sink / 1.3A source)

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Independent TTL compatible inputs

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Integrated bootstrap diode

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Bootstrap supply voltage to 118V DC

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Fast propagation times (27 ns typical)

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Drives 1000 pF load with 15ns rise and fall times

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Excellent propagation delay matching (2 ns typical)

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Supply rail under-voltage lockout

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Low power consumption

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Pin compatible with ISL6700

Typical Applications

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Current Fed push-pull converters

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Half and Full Bridge power converters

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Solid state motor drives

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Two switch forward power converters

Package

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SOIC-8

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LLP-8 (4 mmx4mm)

Simplified Block Diagram

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FIGURE 1.

February 2005

© 2005 National Semiconductor Corporation

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