1. Products
  2. Power Monitor, Control, and Protection
  3. Surge Stopper, Overvoltage, and Overcurrent Protection
  4. LTC7860

Data Sheet
JP
User Guides
2 View All

Overview

Features and Benefits

  • 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

Product Details

The LTC7860 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 (SWITCH-ON 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.

Applications

  • Industrial and Automotive Power
  • Telecom Power
  • Vehicle Power Including ISO7637
  • Military Power Including MIL1275

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Evaluation Kits (2)

Documentation & Resources

  • View All (8)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Product Selector Card (1)
  • Videos (2)
  • Press Releases (1)
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    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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    Step 2: Click on the link in the section below to download a demonstration circuit.

    Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

    LTspice

    LTspice Simulations

    LTC7860 Demo Circuit - High Voltage, High Efficiency Switching Surge Stopper with Timer (7-100V to 34Vmax @ 10A)
    LTC7860 Demo Circuit - High Voltage Surge Suppressor with Timer (3.5-60V to 3.5-17V @ 5A)

    Models for the following parts are available in LTspice:

    LTC7860

    Product Recommendations

    LTC7860 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC7860EMSE#PBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860EMSE#TRPBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860HMSE#PBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860HMSE#TRPBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860IMSE#PBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860IMSE#TRPBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860MPMSE#PBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    LTC7860MPMSE#TRPBF Material Declaration Reliability Data 12-Lead MSOP w/ EP
    Wafer Fabrication Data R547 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC7860EMSE#PBF Production
    • LTC7860EMSE#TRPBF Production
    • LTC7860HMSE#PBF Production
    • LTC7860HMSE#TRPBF Production
    • LTC7860IMSE#PBF Production
    • LTC7860IMSE#TRPBF Production
    • LTC7860MPMSE#PBF Production
    • LTC7860MPMSE#TRPBF Production

    Support & Discussions

    LTC7860 Discussions

    RE: LTC7860 limits current if sense threshold breached?
    20 week(s) ago in Power Management
    All LTC7860 Discussions
    LTC7860 Contact ADI Technical Support »
    LTC7860 Ask your question »
    LTC7860 Contact ADI Technical Support » LTC7860 Ask your question »

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