LTC7860

RECOMMENDED FOR NEW DESIGNS

High Efficiency Switching Surge Stopper

Part Models: 8
1ku List Price: Starting From $3.54

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Overview

High Efficiency V_OUT Clamp Stops High Voltage Input Surges
SWITCH-ON Mode 100% Duty Cycle for Normal Operation
PROTECTIVE PWM Mode for Transients and Faults
V_IN 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

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

Part Models: 8
1ku List Price: Starting From $3.54

Documentation

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC7860EMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860EMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860HMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860HMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860IMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860IMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860MPMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7860MPMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC7860EMSE#PBF	PRODUCTION
LTC7860EMSE#TRPBF	PRODUCTION
LTC7860HMSE#PBF	PRODUCTION
LTC7860HMSE#TRPBF	PRODUCTION
LTC7860IMSE#PBF	PRODUCTION
LTC7860IMSE#TRPBF	PRODUCTION
LTC7860MPMSE#PBF	PRODUCTION
LTC7860MPMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LTC7860EMSE#PBF	PRODUCTION
LTC7860EMSE#TRPBF	PRODUCTION
LTC7860HMSE#PBF	PRODUCTION
LTC7860HMSE#TRPBF	PRODUCTION
LTC7860IMSE#PBF	PRODUCTION
LTC7860IMSE#TRPBF	PRODUCTION
LTC7860MPMSE#PBF	PRODUCTION
LTC7860MPMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC7860

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.

Evaluation Kits

LTC7860EMSE Demo Board | Switching Surge Stopper, 3.5V ≤ VIN ≤ 60V; 3.5V ≤ VOUT ≤ 17.5V @ 5A

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Product Details

Demonstration circuit 2239A is a High Efficiency Switching Surge Stopper and EMI Filter featuring the LTC7860. The board operates from an input range of 3.5V to 60V, provides a 3.5V to 17.2V output at 0A to 5A and is output current limited. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. The demonstration board has options for smaller MOSFET and diode packages on the back of the board for lower output current requirements.

Resources

DC2239A - Demo Manual
4/27/2015

DC2239A - Schematic
4/27/2015

DC2239A - Design Files
4/27/2015

LTC7860EMSE Demo Board | Switching Surge Stopper, 7V ≤ VIN ≤ 100V; 7V ≤ VOUT ≤ 35V @ 10A

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Product Details

Demonstration circuit 2392A is a high efficiency switching surge stopper featuring the LTC7860. The board operates from an input range of 7V to 100V, and provides a 7V to 34V output at 0A to 10A. Its output is current limited. A soft-start feature controls output voltage slew rate at startup, reducing current surge and voltage overshoot. The demonstration board includes an optional reverse polarity protection MOSFET and has options for an input filter and diode to attenuate spikes. For a lower output voltage limit of less than 12V, there is an optional feedback circuit.