LM5109 National Semiconductor, LM5109 Datasheet
LM5109
Manufacturer Part Number
LM5109
Description
100V / 1A Peak Half Bridge Gate Driver
Manufacturer
National Semiconductor
Datasheet
1.LM5109.pdf
(9 pages)
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© 2005 National Semiconductor Corporation
LM5109
100V / 1A Peak Half Bridge Gate Driver
General Description
The LM5109 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. A robust
level shifter technology operates at high speed while con-
suming 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
n Drives both a high side and low side N-Channel
n 1A peak output current (1.0A sink / 1.0A source)
n Independent TTL compatible inputs
Simplified Block Diagram
MOSFET
DS201505
FIGURE 1.
n Bootstrap supply voltage to 118V DC
n Fast propagation times (27 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
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
Package
n SOIC-8
n LLP-8 (4 mm x 4 mm)
20150501
www.national.com
April 2005
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