This part is a kind of semiconductor called PT1301.

Function of this product has Low Voltage Step-up DC/DC Converter.

Manufacturers : PowTech

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Some of the text within the PDF file :

PT1301 High Efficiency Low Voltage Step-up DC/DC Converter GENERATION DESCRIPTION The PT1301 is a compact, high efficiency, and low voltage step-up DC/DC converter with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a PWM comparator, a switch pass element and the driver. It provides stable and high efficient operation over a wide range of load currents without external compensation. The below 1V start-up input voltage makes PT1301 suitable for single battery cell applications. The built-in power transistor is able to provide up to 300mA output current while working under Li-Battery Supply. Besides, it provides extra pin to drive external power devices (NMOS or NPN ) in case higher output current is needed. The output voltage is set with two [ ... ]

PT1301 PDF Datasheet Download