LM5100/LM5101

High Voltage High Side and Low Side Gate Driver

General Description

The LM5100/LM5101 High Voltage Gate Drivers are de-

signed to drive both the high side and the low side

N-Channel MOSFETs in a synchronous buck or a half bridge

configuration. The floating high-side driver is capable of

operating with supply voltages up to 100V. The outputs are

independently controlled with CMOS input thresholds

(LM5100) or TTL input thresholds (LM5101). An integrated

high voltage diode is provided to charge the high side gate

drive bootstrap capacitor. A robust level shifter operates at

high speed while consuming low power and providing clean

level transitions from the control logic to the high side gate

driver. Under-voltage lockout is provided on both the low

side and the high side power rails. This device is available in

the standard SOIC-8 pin and the LLP-10 pin packages.

Features

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Drives both a high side and low side N-Channel

MOSFET

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Independent high and low driver logic inputs (TTL for

LM5101 or CMOS for LM5100)

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Bootstrap supply voltage range up to 118V DC

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Fast propagation times (25 ns typical)

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Drives 1000 pF load with 15 ns rise and fall times

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Excellent propagation delay matching (3 ns typical)

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Supply rail under-voltage lockouts

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Low power consumption

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Pin compatible with HIP2100/HIP2101

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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Synchronous buck converters

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Two switch forward power converters

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Forward with Active Clamp converters

Package

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SOIC-8

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LLP-10 (4 mmx4mm)

Simplified Block Diagram

20088803

FIGURE 1.

January 2004

© 2004 National Semiconductor Corporation

DS200888

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