April 2006
LM5109A
High Voltage 1A Peak Half Bridge Gate Driver
n Bootstrap supply voltage to 108V DC
n Fast propagation times (30 ns typical)
n Drives 1000 pF load with 15ns rise and fall times
n Excellent propagation delay matching (2 ns typical)
n Supply rail under-voltage lockout
General Description
The LM5109A is a cost effective, 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
configuration. The floating high-side driver is capable of
working with rail voltages up to 90V. The outputs are inde-
pendently controlled with TTL compatible input thresholds.
The robust level shift technology operates at high speed
while consuming low power and providing clean level tran-
sitions 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.
n Low power consumption
n Pin compatible with ISL6700
Typical Applications
n Current Fed push-pull converters
n Half and Full Bridge power converters
n Solid state motor drives
n Two switch forward power converters
Features
Package
n Drives both a high-side and low-side N-Channel
MOSFET
n SOIC-8
n LLP-8 (4 mm x 4 mm)
n 1A peak output current (1.0A sink / 1.0A source)
n
Independent TTL compatible inputs
Simplified Block Diagram
20170201
FIGURE 1.
© 2006 National Semiconductor Corporation
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