LINEAR TECHNOLOGY - LT1158 Data Sheet
Summary
This datasheet from Linear Technology covers the LT1158 half-bridge N-channel power MOSFET driver operating from 5 V to 30 V supply with over 500 mA peak driver current and 150 ns transition times when driving 3000 pF loads. The device features adaptive non-overlap gate drives that eliminate MOSFET matching requirements for shoot-through protection, a continuous current limit loop regulating short-circuit current in the top MOSFET, and an on-chip charge pump enabling continuous DC operation of t
Page 1 Text Content
LT1158
Half Bridge N-Channel Power MOSFET Driver FEATURES DESCRIPTION
Drives Gate of Top Side MOSFET Above V+ A single input pin on the LT1158 synchronously controls Operates at Supply Voltages from 5V to 30V two N-channel power MOSFETs in a totem pole configura- 150ns Transition Times Driving 3000p F tion. Unique adaptive protection against shoot-through
Over 500m A Peak Driver Current currents eliminates all matching requirements for the two Adaptive Non-Overlap Gate Drives MOSFETs. This greatly eases the design of high efficiency Continuous Current Limit Protection motor control and switching regulator systems.
Auto Shutdown and Retry Capability
A continuous current limit loop in the LT1158 regulates
Internal Charge Pump for DC Operation
short-circuit current in the top power MOSFET. Higher
Built-In Gate Voltage Protection
start-up currents are allowed as long as the MOSFET VDS
Compatible with Current-Sensing MOSFETs
does not exceed 1.2V. By returning the fault output to the
TTL/CMOS Input Levels
enable input, the LT1158 will automatically shut down in
Fault Output Indication
the event of a fault and retry when an internal pull-up current has recharged the enable capacitor.
APPLICATIONS
An on-chip charge pump is switched in when needed to
PWM of High Current Inductive Loads
turn on the top N-channel MOSFET continuously. Special
Half Bridge and Full Bridge Motor Control
circuitry ensures that the top side gate drive is safely
Synchronous Step-Down Switching Regulators
maintained in the transition between PWM and DC opera-
Three-Phase Brushless Motor Drive
tion. The gate-to-source voltages are internally limited to
High Current Transducer Drivers
14.5V when operating at higher supply voltages.
Battery-Operated Logic-Level MOSFETs
TYPICAL APPLICATION
Top and Bottom Gate Waveforms
BOOSTBOOST DR
V+ T GATE DR
IRFZ34
10µF V+ T GATE FB LOW
T SOURCE
0Hz TO INPUT SENSE+
100k Hz LT1158 RSENSE
ENABLE SENSE– LOAD
VIN = 24V
FAULT B GATE DR RL = 12Ω 1158 TA02
IRFZ34
BIAS B GATE FB
LT1158 TA01
Page Summary Contents For LINEAR TECHNOLOGY - LT1158 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 346.29 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What supply voltages does the LT1158 operate at?
It operates from 5V up to 30V.
How is adaptive protection implemented in the LT1158?
It provides unique adaptive protection against shoot-through and includes a continuous current limit loop for regulation.
Is the LT1158 suitable for motor control applications?
Yes, it can be used for half bridge and full bridge motor control circuitry, including three-phase brushless motor drive.
What happens when a fault occurs in the device?
The LT1158 will automatically shut down, indicate the event via its FAULT output, and attempt to retry when the enable capacitor recharges.
Does the maximum gate voltage limit affect operation?
The internal gate-to-source voltages are limited to 14.5V even when operating at higher supply voltages.