LTC7860 - High Efficiency Switching Surge Stopper


  • High Efficiency VOUT Clamp Stops High Voltage Input Surges
  • SWITCH-ON Mode 100% Duty Cycle for Normal Operation
  • PROTECTIVE PWM Mode for Transients and Faults
  • VIN Pin to SGND Range: 3.5V to 60V
  • External Input Voltage is Extendable to 200V+
  • Adjustable Output Voltage Clamp
  • Adjustable Output Overcurrent Protection
  • Power Inductor Improves Input EMI in Normal Operation
  • Programmable Fault Timer
  • Adjustable Soft-Start for Input Inrush Current Limiting
  • 4.5% Retry Duty Cycle During Faults
  • Adjustable Switching Frequency: 50kHz to 850kHz
  • Optional Reverse Input Voltage Protection
  • Available in Thermally Enhanced 12-lead MSOP Package

Typical Application

LTC7860 Typical Application
LTC7860 Typical Application


The LTC®7860 high efficiency surge stopper protects loads from high voltage transients. High efficiency permits higher currents and smaller solution sizes. During an input overvoltage event, such as a load dump in vehicles, the LTC7860 controls the gate of an external MOSFET to act as a switching DC/DC regulator (PROTECTIVE PWM mode). This operation regulates the output voltage to a safe level, allowing the loads to operate through the input over-voltage event. During normal operation (SWITCHON mode), the LTC7860 turns on the external MOSFET continuously, passing the input voltage through to the output. An internal comparator limits the voltage across the current sense resistor and regulates the maximum output current to protect against overcurrent faults.

An adjustable timer limits the time that the LTC7860 can spend in overvoltage or overcurrent regulation. When the timer expires, the external MOSFET is turned off until the LTC7860 restarts after a cool down period. By strictly limiting the time in PROTECTIVE PWM Mode when the power loss is high, the components and thermal design can be optimized for normal operation and safely operate through high voltage input surges and/or overcurrent faults. An additional PMOS can be added for reverse battery protection.


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
LTC7860EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LTC7860EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC7860HMSE#PBF MS-12E MSE H 05-08-1666 Yes
LTC7860HMSE#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC7860IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LTC7860IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC7860MPMSE#PBF MS-12E MSE MP 05-08-1666 Yes
LTC7860MPMSE#TRPBF MS-12E MSE MP 05-08-1666 Yes

LTC7860 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
LTC7860EMSE#PBF MS-12E E $4.22 $2.95 Yes
LTC7860EMSE#TRPBF MS-12E E $3.01 Yes
LTC7860HMSE#PBF MS-12E H $5.36 $3.75 Yes
LTC7860HMSE#TRPBF MS-12E H $3.81 Yes
LTC7860IMSE#PBF MS-12E I $4.86 $3.40 Yes
LTC7860IMSE#TRPBF MS-12E I $3.46 Yes
LTC7860MPMSE#PBF MS-12E MP $13.11 $9.18 Yes
LTC7860MPMSE#TRPBF MS-12E MP $9.24 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.

Part Number Description Price Documentation
DC2239A LTC7860EMSE Demo Board | Switching Surge Stopper, 3.5V ≤ VIN ≤ 60V; 3.5V ≤ VOUT ≤ 17.5V @ 5A $150.00
DC2392A LTC7860EMSE Demo Board | Switching Surge Stopper, 7V ≤ VIN ≤ 100V; 7V ≤ VOUT ≤ 35V @ 10A $150.00
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  • Industrial and Automotive Power
  • Telecom Power
  • Vehicle Power Including ISO7637
  • Military Power Including MIL1275

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