LT1910_15 Datasheet, PDF (1/14 Pages) Linear Technology – Protected High Side MOSFET Driver

Features
n _{8V to 48V Power Supply Range}
n _{Protected from –15V to 60V Supply Transients}
n _{Short-Circuit Protected}
n _{Automatic Restart Timer}
n _{Open-Collector Fault Flag}
n _{Fully Enhances N-Channel MOSFET Switches}
n _{Programmable Current Limit, Delay Time and}
Autorestart Period
n _{Voltage Limited Gate Drive}
n _{Defaults to Off State with Open Input}
n _{Available in SO-8 Package}
Applications
n _{Industrial Control}
n _{Avionics Systems}
n _{Automotive Switches}
n _{Stepper Motor and DC Motor Control}
n _{Electronic Circuit Breaker}
LT1910
Protected High Side
MOSFET Driver
Description
The LT^®1910 is a high side gate driver that allows the use of
low cost N-channel power MOSFETs for high side switching
applications. It contains a completely self-contained charge
pump to fully enhance an N-channel MOSFET switch with
no external components.
When the internal drain comparator senses that the switch
current has exceeded the preset level, the switch is turned
off and a fault flag is asserted. The switch remains off for
a period of time set by an external timing capacitor and
then automatically attempts to restart. If the fault still
exists, this cycle repeats until the fault is removed, thus
protecting the MOSFET. The fault flag becomes inactive
once the switch restarts successfully.
The LT1910 has been specifically designed for harsh
operating environments such as industrial, avionics and
automotive applications where poor supply regulation and/
or transients may be present. The device will not sustain
damage from supply transients of –15V to 60V.
The LT1910 is available in the SO-8 package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical Application
Fault Protected High Side Switch
5V
24V
FAULT OUTPUT
OFF ON
5.1k
LT1910
FAULT
V⁺
0.01Ω
IN SENSE
TIMER GATE
GND
+
0.1µF
IRFZ34
10µF
50V ^LOAD
1910 TA01
Switch Drop vs Load Current
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
1
2
3
4
5
LOAD CURRENT (A)
1910 TA02
For more information www.linear.com/LT1910
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