LTC7860 Datasheet | Linear Technology

LTC7860 High Efficiency Switching Surge Stopper Features nn High Efficiency VOUT Clamp Stops High Voltage Input Surges nn SWITCH-ON Mode 100% Duty Cycle for Normal Operation nn PROTECTIVE PWM Mode for Transients and Faults nn nn VIN Pin to SGND Range: 3.5V to 60V External Input Voltage is Extendable to 200V+ nn Adjustable Output Voltage Clamp nn Adjustable Output Overcurrent Protection nn Power Inductor Improves Input EMI in Normal Operation nn Programmable Fault Timer nn Adjustable Soft-Start for Input Inrush Current Limiting nn 4.5% Retry Duty Cycle During Faults nn Adjustable Switching Frequency: 50k Hz to 850k Hz nn Optional Reverse Input Voltage Protection nn Available in Thermally Enhanced 12-lead MSOP Package Applications nn Industrial and Automotive Power nn Tele Power nn Vehicle Power Including ISO7637 nn Military Power Including MIL1275 L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5731694. Description 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 parator 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...