LTC7862HUFD#PBF

LTC7862HUFD#PBF is a high efficiency switching surge stopper that protects loads from high voltage transients. The high efficiency switching allows high output currents, small solution sizes, and high reliability. During an input overvoltage event, the LTC7862 controls the gates of two external N-channel MOSFETs to act as a switching DC/DC step-down regulator. During normal operation, the LTC7862 turns on the top external N-channel MOSFET continuously, passing the input voltage through to the output, with minimal voltage drop. Using a fast peak current comparator, the LTC7862 also limits the maximum output current to protect against overcurrent and short-circuit faults. An adjustable timer limits the time that the LTC7862 can spend switching during an overvoltage, overcurrent, or startup condition. Applications include automotive/avionic/industrial surge protection, automotive load dump protection, vehicle power including ISO7637, military power including MIL1275.

• VOUT clamp stops high voltage input surges
• 100% duty cycle pass-through mode during normal operation
• Switches during overvoltage or overcurrent transients and faults and during startup
• High efficiency switching enables long duration surge protection and high output currents
• Adjustable output overcurrent protection
• RSENSE or inductor DCR current sensing, 2.7% retry duty cycle during fault
• Power inductor reduces input EMI in normal mode, adjustable soft-start for inrush current limiting
• Programmable fault timer, open-drain fault warning indicator
• Adjustable input voltage turn-on threshold, adjustable input overvoltage lockout threshold
• 20-lead plastic QFN package, -40°C to 150°C temperature range

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