This part is a kind of semiconductor called UP6101.

Function of this product has 5V/12V Synchronous-Rectified Buck Controller.

Manufacturers : uPI Semiconductor

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uP6101 5V/12V Synchronous-Rectified Buck Controller General Description The uP6101 is a compact synchronous-rectified buck controller specifically designed to operate from 5V or 12 supply voltage and to deliver high quality output voltage as low as 0.6V (uP6101A) or 0.8V (uP6101B/C). This (P)SOP8 device operates at fixed 300kHz (uP6101A/B) or 200kHz (uP6101C) frequency and provides an optimal level of integration to reduce size and cost of the power supply. This controller integrates internal MOSFET drivers that support 12V+12V bootstrapped voltage for high efficiency power conversion. The bootstrap diode is built-in to simplify the circuit design and minimize external part count. Other features include internal softstart, under voltage protection, over current protection and shutdown func [ ... ]

UP6101 PDF Datasheet Download