This part is a kind of semiconductor called FP6715.

Function of this product has 550KHz High Efficiency Low Ripple Synchronous Step-Up Converter.

Manufacturers : Fiti

Image and pinout :

Some of the text within the PDF file :

fitipower integrated technology lnc. FP6715 5V, 2.5A, 550KHz High Efficiency Low Ripp8l5eT Synchronous Step-Up Converter Description The FP6715 is a high efficiency, fixed frequency 550KHz, current mode PWM boost DC/DC converter which could operate battery such as input voltage down to 2.5V. The converter output voltage can be adjusted to a maximum of 5.25V by an external resistor divider. Besides the converter includes a 0.08Ω N-channel MOSFET switch and 0.12Ω P-channel synchronous rectifier. So no external Schottky diode is required and could get better efficiency near 93%. The converter is based on a fixed frequency, current mode, pulse-width-modulation PWM controller that goes automatically into PSM mode at light load. When converter operation into discontinuous mode, the internal [ ... ]

FP6715 PDF Datasheet Download