View ap131-series datasheet:

AP131 300mA Low Dropout Linear Regulator with Shutdown Features General Descriptions - Input voltage range is up to 7V The AP131 is a 300mA, fixed output voltage, low - Dropout voltage 400mV at 300mA output current dropout linear regulator. The Device included pass - Guaranteed 300mA output current. element, error amplifier, band-gap, current limit and - Internal Ron =1.5Ω PMOS draws no base current thermal shutdown circuitry. The device is ON when EN pin is set to logic high level. - Low quiescent current 50µA The characteristics of low dropout voltage and less - Output voltage 2% accuracy, and 1.5V to 5V with quiescent current make it good for some critical 0.1V step current application, for example, some battery - Active low shutdown function (EN pi