AnalogicTech has released the AAT4614, a new current-limited P-channel MOSFET power switch for high-side load switching applications. Designed to protect peripheral ports from short-circuit and over-voltage events, the new load switch combines reverse current blocking with programmable current limit capability and an integrated fault flag in a small silicon footprint.
Operating across an input range of 2,4 to 5,5 V, the device can be used in both 3 and 5 V systems. When the input drops below 2,4 V, an under-voltage lockout circuit automatically shuts down operation to avoid saturation. To protect it against large input currents which could cause the supply to fall out of regulation, the load switch features an over-current threshold which is programmable up to 1,6 A via a resistor. A very fast 1 μs current limit transient response reduces the requirements for local supply bypassing.
The AAT4614 adds a reverse current blocking capability to protect it from reverse current potentials when disabled. In addition, the device features an open drain FAULT flag to indicate an over-current or over-temperature condition. A 4 ms blanking time prevents false reporting during charge of a capacitive load. The load switch features RDS(ON) of 130 m. To conserve power, quiescent current is only 10 μA, while in shutdown mode, supply current decreases to less than 1 μA. The device also features an over-temperature protection circuit that automatically switches the device off if die temperature exceeds a pre-defined limit.
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