The LTC7860 from Linear Technology is a high-efficiency surge stopper that protects loads from high-voltage transients. During an input over-voltage event, such as a load dump in vehicles, the device controls the gate of an external MOSFET to act as a switching DC-DC regulator. This operation regulates the output voltage to a safe level, allowing the loads to operate through the event.
During normal operation, 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 over-current faults.
An adjustable timer limits the time that the IC can spend in over-voltage or over-current 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 optimised for normal operation and safely operate through high-voltage input surges and/or over-current faults. An additional PMOS can be added for reverse battery protection.
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