LTC4362-2 Datasheet | Linear Technology

LTC4362-1/LTC4362-2 1.2A Overvoltage/Overcurrent Protector Features nn 2.5V to 5.5V Operation nn Overvoltage Protection Up to 28V nn Internal 40mΩ N-Channel MOSFET and 31mΩ RSENSE nn Avalanche Rated MOSFET Requires No Input Capacitor or TVS for Most Applications nn <1µs Overvoltage Turn-Off, Gentle Shutdown nn 2% Accurate 5.8V Overvoltage Threshold nn 20% Accurate 1.5A Overcurrent Threshold nn Input Withstands Up to ±25k V HBM ESD with ≥1µF COUT nn Controlled Power-Up d V/dt Limits Inrush Current nn Reverse Voltage Protection Driver nn Low Current Shutdown nn Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2) After Overcurrent nn Available in 8-Lead DFN 2mm × 3mm Package APPLICATIONS nn USB Protection nn Handheld puters nn Cell/Smart Phones nn MP3/MP4 Players nn Digital Cameras All registered trademarks and trademarks are the property of their respective owners. DESCRIPTION The LTC®4362 monolithic overvoltage/overcurrent protector safeguards 2.5V to 5.5V systems from power supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports. The LTC4362 controls an internal 40mΩ N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4362 turns off the MOSFET within 1µs, isolating downstream ponents from the input supply. In most applications, the LTC4362 rides through inductive cable transients without requiring transient voltage suppressors or other external ponents. An internal current sense resistor is used to implement overcurrent protection. The LTC4362 has a delayed start-up at plug-in and controlled d V/dt ramp-up for inrush current limiting. A PWRGD pin provides power good monitoring for VIN. The LTC4362 Features a soft-shutdown controlled by the ON pin and drives an optional external P-channel MOSFET for negative voltage protection. Following an overvoltage condition, the LTC4362 automatically restarts with a 130ms delay. After an...