Tool Safeguards Low-Voltage Portable Electronics

The LTC4362 is a 2.5 to 5.5V overvoltage and overcurrent protector that safeguards low-voltage, portable electronics from damaging input voltage transients and current surges. The LTC4362 utilises a two-per-cent-accurate 5.8V overvoltage threshold to detect an overvoltage event and responds quickly within 1us (max) to isolate the downstream components from the input. Overvoltage protection of up to 28V is achieved with an internal, avalanche-rated, low-RDS(ON) MOSFET and rides through inductive cable transients without requiring transient voltage suppressors (TVS) or other external components in most applications.

In addition, the LTC4362 monitors the voltage drop across an internal current sense resistor to provide a 20-per-cent-accurate, 1.5A overcurrent threshold. The LTC4362 is targeted for portable electronics with multiple power supply options, such as mobile phones, MP3/MP4 players, and digital cameras that charge via wall and car battery adapters and USB ports. The LTC4362 controls an internal 40mOhm N-channel MOSFET so that, under normal operation, it provides a low loss path from the input to the load.

Inrush current limiting is achieved with a controlled gate voltage slew rate. If the voltage at the input exceeds the overvoltage threshold of 5.8V, the gate is pulled low within 1us to protect the load. The LTC4362 features a soft shutdown controlled by the /ON pin and provides a gate drive output for an optional external P-channel MOSFET for reverse voltage protection.

A power-good output pin indicates gate turn on. The LTC4362 is available in two options; the LTC4362-1 latches off after an overcurrent event, whereas the LTC4362-2 performs an auto-retry following a 130ms delay. Following an overvoltage condition, both options automatically restart with a start-up delay. Specified over the full commercial and industrial temperature ranges, the LTC4362 is offered in 8-pin, 2 x 3mm DFN packages.

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