Power Electronics

Adjustable Current Limited Load Switch with Fault Flag

Analogic Tech's AAT4614 SmartSwitch is a current limited P-channel MOSFET power switch designed for high side load switching applications. This switch operates with inputs ranging from 2.4V to 5.5V, making it ideal for both 3V and 5V systems. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. Reverse current blocking is provided to protect the load switch from reverse current potentials while the device is shutdown.

The AAT4614 is also protected from thermal overload which is limited by power dissipation and junction temperatures. Current limit threshold is programmed with a resistor from SET to ground and may be adjusted for levels up to 1.6A. The ultra-fast current limit response to a sudden short circuit is a mere 1µs which reduces the requirements of local supply bypassing. An open drain FAULT flag signals an over current or over-temperature condition after a 4ms blanking time to prevent false reporting. Quiescent current is a low 10µA and the supply current decreases to less than 1µA in shutdown mode.

The AAT4614 is offered in the small Pb-free, 8-pin SC70JW, SOT23-6 and SOT23-5 packages, and is specified for operation over the -40°C to +85°C ambient temperature range.

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