LT1161 - Quad Protected High-Side MOSFET Driver


  • 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

Typical Application

LT1161 Typical Application
LT1161 Typical Application


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 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.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT1161CN#PBF N-20 N C 05-08-1510 (N20) Yes
LT1161CSW#PBF SW-20 SW C 05-08-1620 (SW20) Yes
LT1161CSW#TRPBF SW-20 SW C 05-08-1620 (SW20) Yes
LT1161IN#PBF N-20 N I 05-08-1510 (N20) Yes
LT1161ISW#PBF SW-20 SW I 05-08-1620 (SW20) Yes
LT1161ISW#TRPBF SW-20 SW I 05-08-1620 (SW20) Yes

LT1161 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT1161CN#PBF N-20 C $4.00 $3.20 Yes
LT1161CSW#PBF SW-20 C $4.30 $3.50 Yes
LT1161CSW#TRPBF SW-20 C $3.60 Yes
LT1161IN#PBF N-20 I $4.50 $3.60 Yes
LT1161ISW#PBF SW-20 I $4.80 $3.90 Yes
LT1161ISW#TRPBF SW-20 I $4.00 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Industrial Control
  • Avionics Systems
  • Automotive Switches
  • Stepper Motor and DC Motor Control
  • Electronic Circuit Breaker

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Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

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