LT1161IS Linear Technology Corporation, LT1161IS Datasheet

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LT1161IS

Manufacturer Part Number
LT1161IS
Description
Quad protected high-side MOSFET driver
Manufacturer
Linear Technology Corporation
Datasheet

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APPLICATIONS
FEATURES
TYPICAL
INPUTS
Fully Enhances N-Channel MOSFET Switches
8V to 48V Power Supply Range
Protected from – 15V to 60V Supply Transients
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
Industrial Control
Avionics Systems
Automotive Switches
Stepper Motor and DC Motor Control
Electronic Circuit Breaker
24V
0.1 F
0.1 F
C
0.1 F
0.1 F
T
Figure 1. Protected Quad High-Side Switch
T1
T2
T3
T4
IN1
IN2
IN3
IN4
GND
GND
APPLICATION
V
+
LT1161
U
V
+
DS1
DS2
DS3
DS4
G1
G2
G3
G4
U
IRFZ34
IRFZ34
IRFZ34
IRFZ34
0.01
0.01
0.01
0.01
R
S
LOAD
LOAD
LOAD
LOAD
#1
#2
#3
#4
+
1161 F01
50 F
50V
Quad Protected High-Side
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.
DESCRIPTION
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
Switch Drop vs Load Current
1
U
LOAD CURRENT (A)
2
MOSFET Driver
3
4
1161 TA01
5
LT1161
1

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LT1161IS Summary of contents

Page 1

FEATURES Fully Enhances N-Channel MOSFET Switches 8V to 48V Power Supply Range Protected from – 15V to 60V Supply Transients Individual Short-Circuit Protection Individual Automatic Restart Timers Programmable Current Limit, Delay Time, and Auto-Restart Period Voltage-Limited Gate Drive Defaults to ...

Page 2

... The denotes specifications which apply over the full operating temperature range. Note calculated from the ambient temperature T J dissipation P according to the following formulas: D LT1161CN, LT1161IN C/ LT1161CS, LT1161IS 110 C/ RATINGS PACKAGE/ORDER GND TIMER1 + 5V INPUT 1 TIMER 2 ...

Page 3

W U TYPICAL PERFORMANCE CHARACTERISTICS Supply Current ALL CHANNELS ALL CHANNELS OFF INPUT VOLTAGE (V) 1161 G01 Supply Current ...

Page 4

LT1161 PIN FUNCTIONS Supply Pins: The two supply pins are internally connected and must also be externally connected. In addition to providing the operating current for the LT1161, the supply pins also serve as the Kelvin connection ...

Page 5

U OPERATIO (Each Channel, Refer to Functional Diagram) The LT1161 gate pin has two states, OFF and ON. In the OFF state it is held low, while in the ON state it is pumped to 12V above supply by a ...

Page 6

LT1161 U U APPLICATIONS INFORMATION Drain Sense Configuration The LT1161 uses supply-referenced current sensing. One input of each channel’s current-sense comparator is con- nected to a drain sense pin, while the second input is offset 65mV below the supply bus ...

Page 7

U U APPLICATIONS INFORMATION spike can play havoc with the power supply and false trip the current-sense comparator. Turn- controlled by the addition of the simple network shown in Figure 6. This network takes advantage of the ...

Page 8

LT1161 APPLICATIONS INFORMATION Low Voltage/Wide Supply Range Operation When the supply is <12V, the LT1161 charge pumps do not produce sufficient gate voltage to fully enhance stan- dard N-channel MOSFETs. For these applications, logic- level MOSFETs can ...

Page 9

U U APPLICATIONS INFORMATION 8V TO 24V 1N4148 + + V V DS1 LT1161 2N2222 51 DS2 1/2 2N2222 LT1013 51 Figure 9b. Low-Side Drivers with Two Approaches for Source Current ...

Page 10

LT1161 U TYPICAL APPLICATIONS Protected Quad 1A Automotive Solenoid Driver with Overvoltage Shutdown 0.33 F 0.33 F 0.33 F INPUTS 0.33 F 2N3904 Protected Quad Switch with Mixed Low- and High-Side Driving 0.33 F 0.33 F HIGH-SIDE ...

Page 11

... FAULT OUTPUT Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights GND ...

Page 12

... N20 0592 0.394 – 0.419 (10.007 – 10.643 0.037 – 0.045 (0.940 – 1.143) 0.004 – 0.012 (0.102 – 0.305) SOL20 0392 LT/GP 0494 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 ...

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