LTC4361-2 Datasheet | Linear Technology

Features nn 2.5V to 5.5V Operation nn Overvoltage Protection Up to 80V nn No Input Capacitor or TVS Required for Most Applications nn 2% Accurate 5.8V Overvoltage Threshold nn 10% Accurate 50m V Overcurrent Circuit Breaker nn <1µs Overvoltage Turn-Off, Gentle Shutdown nn Controls N-Channel MOSFET nn Adjustable Power-Up d V/dt Limits Inrush Current nn Reverse Voltage Protection nn Power Good Output nn Low Current Shutdown nn Latchoff (LTC4361-1) or Auto-Retry (LTC4361-2) After Overcurrent nn Available in 8-Lead Thin SOT™ and 8-Lead (2mm × 2mm) DFN Packages APPLICATIONS nn USB Protection nn Handheld puters nn Cell/Smart Phones nn MP3/MP4 Players nn Digital Cameras LTC4361-1/LTC4361-2 Overvoltage/Overcurrent Protection Controller DESCRIPTION The LTC®4361 overvoltage/overcurrent protection controller safeguards 2.5V to 5.5V systems from input supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports. The LTC4361 controls an external N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4361 turns off the MOSFET within 1µs, isolating downstream ponents from the input supply. Inductive cable transients are absorbed by the MOSFET and load capacitance. In most applications, the LTC4361 provides protection from transients up to 80V without requiring transient voltage suppressors or other external ponents. The LTC4361 has a delayed start-up and adjustable d V/ dt ramp-up for inrush current limiting. A PWRGD pin provides power good monitoring for VIN. The LTC4361 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 LTC4361 automatically restarts with a start-up delay. After an overcurrent fault, the LTC4361-1 remains off while the LTC4361-2 automatically restarts after a 130ms start-up delay. All registered trademarks and...