Protected High Side MOSFET Driver
Description
LT1910 Protected High Side MOSFET Driver
FEATURES
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DESCRIPTIO
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8V to 48V Power Supply Range Protected from –15V to 60V Supply Transients Short-Circuit Protected Automatic Restart Timer Open-Collector Fault Flag Fully Enhances N-Channel MOSFET Switches Programmable Current Limit, Delay Time and Autorestart Period Voltage Limited Gate Drive Defaults to OFF State with Open Input Available in SO-8 Package
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U APPLICATIO S
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Industrial Control Avionics Systems Automotive Switches Stepper Motor and DC Motor Control Electronic Circuit Breaker
TYPICAL APPLICATIO
5V 5.
1k FAULT OUTPUT OFF ON
Fault Protected High Side Switch
24V LT1910 8 V+ FAULT 4 6 IN SENSE 2 5 TIMER GATE 3 GND 0.
1µF 1
0.
50 0.
45
Switch Drop vs Load Current
0.
01Ω TOTAL DROP (V)
0.
40 0.
35 0.
30 0.
25 0.
20 0.
15 0.
10
IRFZ34 10µF 50V
+
LOAD
1910 TA01
0.
05 0 0 1 3 2 LOAD CURRENT (A) 4 5
1910 TA02
U
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