The AAT4631/AAT4631-1 SmartSwitch from Skyworks are high-power, current limited P-channel MOSFET power switches designed for high-side load switching applications. They operate with inputs ranging from 2,4 V to 5,5 V, making them relevant for both 3 V and 5 V 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 shut down. The ICs are also protected from thermal overload which is limited by power dissipation and junction temperatures.
Current limit threshold of the AAT4631 is programmed from 500 mA to 3,1 A with a resistor from SET to ground. The current limit threshold can also be removed to allow up to 3 A continuous and 4 A peak current to flow through the load switch by shorting the SET pin to ground. The current limit response to a sudden short circuit is a mere 1 s which reduces the requirements of local supply bypassing.
An open drain fault flag (FLT) in AAT4631/AAT4631-1 signals an over-current or over-temperature condition after a 5 ms blanking time to prevent false reporting. Quiescent current is a low 10 μA and the supply current decreases to less than 1 μA in shutdown mode.
The ICs are offered in the lead-free, 10-pin TDFN2222-10 package, and are specified for operation over the -40°C to +85°C ambient temperature range.
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