LT1161_06 Datasheet, PDF (1/12 Pages) Linear Technology – Quad Protected High-Side MOSFET Driver

FEATURES
■ _{8V to 48V Power Supply Range}
■ _{Protected from – 15V to 60V Supply Transients}
■ _{Fully Enhances N-Channel MOSFET Switches}
■ _{Individual Short-Circuit Protection}
■ _{Individual Automatic Restart Timers}
■ _{Programmable Current Limit, Delay Time, and}
Auto-Restart Period
■ _{Voltage-Limited Gate Drive}
■ _{Defaults to OFF State with Open Input}
■ _{Flowthrough Input to Output Pinout}
■ _{Available in 20-Lead DIP or SOL Package}
U
APPLICATIO S
■ _{Industrial Control}
■ _{Avionics Systems}
■ _{Automotive Switches}
■ _{Stepper Motor and DC Motor Control}
■ _{Electronic Circuit Breaker}
LT1161
Quad Protected High-Side
MOSFET Driver
DESCRIPTIO
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
24V
C_T
0.1µF
V⁺
T1
V⁺
DS1
R_S
0.01Ω
50µF
50V
0.1µF
T2
G1
0.1µF
DS2
T3
0.1µF _{T4 LT1161} ^G2
IN1
DS3
INPUTS
IN2
IN3
G3
IN4
GND
DS4
GND
G4
IRFZ34
0.01Ω
IRFZ34
0.01Ω
IRFZ34
0.01Ω
IRFZ34
LOAD
#1
LOAD
#2
LOAD
#3
LOAD
#4
1161 F01
Figure 1. Protected Quad High-Side Switch
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)
1161 TA01
1161fa
1