This part is a kind of semiconductor called AP7331.
Function of this product has FAST TRANSIENT LOW DROPOUT Linear Regulator.
Manufacturers : Diodes
Image and pinout :
Some of the text within the PDF file :
AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Description The AP7331 is a 300mA, adjustable and fixed output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. The characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for example, battery powered devices. The typical quiescent current is approximately 65μA. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP7331 is available in SOT25 and DFN2020-6 packages. Pin Assignments SOT25 (Fixed Output) (Top View) IN 1 GND 2 EN 3 4 NC 5 OUT SOT25 (A [ ... ]