UVLO

VEE

IN_A

VCC

VCC

OUT_A

VEE

OUT_B

VEE

IN_B

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9

LM5111

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SNVS300H – JULY 2004 – REVISED SEPTEMBER 2016

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Copyright © 2004–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

LM5111 dual gate driver consists of two independent and identical driver channels with TTL compatible logic

inputs and high current totem-pole outputs that source or sink current to drive MOSFET gates. The driver output

consist of a compound structure with MOS and bipolar transistor operating in parallel to optimize current

capability over a wide output voltage and operating temperature range. The bipolar device provides high peak

current at the critical threshold region of the MOSFET VGS while the MOS devices provide rail-to-rail output

swing. The totem pole output drives the MOSFET gate between the gate drive supply voltage VCC and the power

ground potential at the VEE pin.

The control inputs of the drivers are high impedance CMOS buffers with TTL compatible threshold voltages. The

LM5111 pinout was designed for compatibility with industry standard gate drivers in single supply gate driver

applications.

The input stage of each driver should be driven by a signal with a short rise and fall time. Slow rising and falling

input signals, although not harmful to the driver, may result in the output switching repeatedly at a high

frequency.

8.2 Functional Block Diagram