LT1910 Datasheet, PDF (1/12 Pages) Linear Technology – Protected High Side MOSFET Driver

FEATURES
s _{8V to 48V Power Supply Range}
s _{Protected from –15V to 60V Supply Transients}
s _{Short-Circuit Protected}
s _{Automatic Restart Timer}
s _{Open-Collector Fault Flag}
s _{Fully Enhances N-Channel MOSFET Switches}
s _{Programmable Current Limit, Delay Time and}
Autorestart Period
s _{Voltage Limited Gate Drive}
s _{Defaults to OFF State with Open Input}
s _{Available in SO-8 Package}
U
APPLICATIO S
s _{Industrial Control}
s _{Avionics Systems}
s _{Automotive Switches}
s _{Stepper Motor and DC Motor Control}
s _{Electronic Circuit Breaker}
LT1910
Protected High Side
MOSFET Driver
DESCRIPTIO
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-con-
tained 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Fault Protected High Side Switch
5V
24V
FAULT OUTPUT
OFF ON
5.1k
3
LT1910
FAULT
V⁺
8
4
IN
6
SENSE
2 _{TIMER GATE} 5
GND
1
+
0.1µF
0.01Ω
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
sn1910 1910fs
1