LT1161
Quad Protected High-Side
MOSFET Driver
FEATURES
DESCRIPTIO
8V to 48V Power Supply Range The LT1161 is a quad high-side gate driver allowing the
Protected from 15V to 60V Supply Transients use of low cost N-channel power MOSFETs for high-side
Fully Enhances N-Channel MOSFET Switches switching applications. It has four independent switch
Individual Short-Circuit Protection channels, each containing a completely self-contained
Individual Automatic Restart Timers charge pump to fully enhance an N-channel MOSFET
Programmable Current Limit, Delay Time, and switch with no external components.
Auto-Restart Period
Also included in each switch channel is a drain sense
Voltage-Limited Gate Drive
comparator that is used to sense switch current. When a
Defaults to OFF State with Open Input
preset current level is exceeded, the switch is turned off.
Flowthrough Input to Output Pinout
The switch remains off for a period of time set by an
Available in 20-Lead DIP or SOL Package
external timing capacitor and then automatically attempts
to restart. If the fault is still present, this cycle repeats until
U
the fault is removed, thus protecting the MOSFET.
APPLICATIO S
The LT1161 has been specifically designed for harsh
Industrial Control
operating environments such as industrial, avionics, and
Avionics Systems
automotive applications where poor supply regulation
Automotive Switches
and/or transients may be present. The device will not
Stepper Motor and DC Motor Control
sustain damage from supply voltages of 15V to 60V.
Electronic Circuit Breaker
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
24V
50F
Switch Drop vs Load Current
50V
C
T
+ + R
S
V V 0.50
0.1F
0.01
DS1
T1
0.45
0.1F
G1
IRFZ34
0.40
T2
LOAD
0.35
0.1F #1
DS2 0.01
T3
0.30
G2 IRFZ34
0.1F
0.25
LT1161
T4 LOAD
#2
DS3 0.01
0.20
IN1
IN2
0.15
INPUTS
G3
IRFZ34
IN3
LOAD
0.10
IN4
DS4 0.01 #3
GND
0.05
GND G4 IRFZ34 0
0 1 2 3 4 5
LOAD
#4 LOAD CURRENT (A)
1161 TA01
1161 F01
Figure 1. Protected Quad High-Side Switch
1161fa
1
TOTAL DROP (V)
+
U
ULT1161
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
Supply Voltages (Pins 11, 20) ................... 15V to 60V
TOP VIEW
ORDER PART
Input Voltages (Pins 3, 5, 7, 9) ...... (GND 0.3V) to 15V
+
NUMBER
GND 1 20 V
Gate Voltages (Pins 12, 14, 16, 18) ........................ 75V
TIMER1 2 19 SENSE 1
+
LT1161CN
Sense Voltages (Pins 13, 15, 17, 19) .................V 5V 3 18 GATE 1
INPUT 1
4 17 SENSE 2 LT1161CSW
TIMER 2
Current (Any Pin).................................................. 50mA
INPUT 2 5 16 GATE 2
LT1161IN
Operating Temperature Range
TIMER 3 6 15 SENSE 3
LT1161ISW
LT1161C............................................... 0C to 70C
7 GATE 3
INPUT 3 14
LT1161I ............................................ 40C to 85C
8 13 SENSE 4
TIMER 4
Junction Temperature Range (Note 1)
INPUT 4 9 12 GATE 4
+
GND 10 11 V
LT1161C.............................................. 0C to 125C
LT1161I ......................................... 40C to 150C
N PACKAGE SW PACKAGE
20-LEAD PLASTIC DIP 20-LEAD PLASTIC SO
Storage Temperature Range ................. 65C to 150C
= 70C/ W (N)
JA
Lead Temperature (Soldering, 10 sec).................. 300C = 110C/ W (S)
JA
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: