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LT1161 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1161
Description  Quad Protected High-Side MOSFET Driver
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1161 Datasheet(HTML) 1 Page - Linear Technology

 
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LT1161
Quad Protected High-Side
MOSFET Driver
s
Fully Enhances N-Channel MOSFET Switches
s
8V to 48V Power Supply Range
s
Protected from – 15V to 60V Supply Transients
s
Individual Short-Circuit Protection
s
Individual Automatic Restart Timers
s
Programmable Current Limit, Delay Time, and
Auto-Restart Period
s
Voltage-Limited Gate Drive
s
Defaults to OFF State with Open Input
s
Flowthrough Input to Output Pinout
s
Available in 20-Lead DIP or SOL Package
The LT1161 is a quad high-side gate driver allowing the
use of low cost N-channel power MOSFETs for high-side
switching applications. It has four independent switch
channels, each containing a completely self-contained
charge pump to fully enhance an N-channel MOSFET
switch with no external components.
Also included in each switch channel is a drain sense
comparator that is used to sense switch current. When a
preset current level is exceeded, the switch is turned off.
The switch remains off for a period of time set by an
external timing capacitor and then automatically attempts
to restart. If the fault is still present, this cycle repeats until
the fault is removed, thus protecting the MOSFET.
The LT1161 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 voltages of –15V to 60V.
FEATURES
DESCRIPTION
s
Industrial Control
s
Avionics Systems
s
Automotive Switches
s
Stepper Motor and DC Motor Control
s
Electronic Circuit Breaker
APPLICATIONS
TYPICAL APPLICATION
+
CT
0.1
µF
0.1
µF
0.1
µF
0.1
µF
0.01
IRFZ34
24V
INPUTS
1161 F01
IRFZ34
IRFZ34
IRFZ34
RS
0.01
0.01
0.01
LOAD
#1
50
µF
50V
LOAD
#2
LOAD
#3
LOAD
#4
DS1
G1
DS2
G2
DS3
G3
DS4
G4
V+
V+
T1
T2
T3
T4
GND
GND
IN1
IN2
IN3
IN4
LT1161
Switch Drop vs Load Current
LOAD CURRENT (A)
0
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
4
1161 TA01
1
2
3
5
Figure 1. Protected Quad High-Side Switch


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