This part is a kind of semiconductor called AP6502.

Function of this product has 340kHz 23V 2A SYNCHRONOUS DC/DC BUCK CONVERTER.

Manufacturers : Diodes

Image and pinout :

Some of the text within the PDF file :

AP6502 340kHz 23V 2A SYNCHRONOUS DC/DC BUCK CONVERTER Description The AP6502 is a 340kHz switching frequency external compensated synchronous DCDC buck converter. It has integrated low RDSON high and low side MOSFETs. The AP6502 enables continues load current of up to 2A with efficiency as high as 95%. Pin Assignments ( Top View ) BS IN SW GND 1 2 3 4 8 7 6 5 SS EN COMP FB NEW PRODUCT The AP6502 features current mode control operation, which enables fast transient response times and easy loop stabilization. The AP6502 simplifies board layout and reduces space requirements with its high level of integration and minimal need for external components, making it ideal for distributed power architectures. The AP6502 is available in a standard Green SO-8EP package with exposed PAD for improve [ ... ]

AP6502 PDF Datasheet Download