This part is a kind of semiconductor called AP2301A.

Function of this product has 2.0A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

AP2301A/AP2311A 2.0A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH Description The AP2301A and AP2311A are single channel, current-limited, integrated high-side power switches optimized for Universal Serial Bus (USB) and other hot-swap applications. The family of devices complies with USB standards and is available with both polarities of Enable input. The devices have fast short-circuit response time for improved overall system robustness, and have integrated output discharge function to ensure completely controlled discharging of the output voltage capacitor. They provide a complete protection solution for applications subject to heavy capacitive loads and the prospect of short circuit, and offer reverse current blocking, over-current, over-temperature and short-circuit protection, as wel [ ... ]

AP2301A PDF Datasheet Download