This part is a kind of semiconductor called A7530.

Function of this product has 350KHz PFM STEP-UP DC-DC CONVERTER.

Manufacturers : AiT

Image and pinout :

Some of the text within the PDF file :

AiT Semiconductor Inc. Inc. www.ait-ic.com A7530 350KHz PFM STEP-UP DC-DC CONVERTER INTERNAL SWITCH W/HIGH EFFICIENCY AND LOW NOISE DESCRIPTION A7530 is CMOS-based PFM step-up DC-DC converter. The converter can start up by supply voltage as low as 0.8V input Voltage. Quiescent current drawn from power source is as low as 7uA. All of these features make A7530 be suitable for the portable devices, which are supplied by a single battery to four-cell batteries. To reduce the noise caused by the switch regulator, A7530 is well considerate in circuit design and manufacture. So that the interferer to other circuits by the device is reduced greatly. A7530 integrates stable reference circuits and trimming technology, so it can afford high precision and low temperature-drift coefficient of the out [ ... ]

A7530 PDF Datasheet Download