This part is a kind of semiconductor called TC110.

Function of this product has PFM/PWM Step-Up DC/DC Controller.

Manufacturers : Microchip Technology

Image and pinout :

Some of the text within the PDF file :

TC110 PFM/PWM Step-Up DC/DC Controller Features • • • • • Assured Start-up at 0.9V 50µA (Typ) Supply Current (fOSC = 100kHz) 300mA Output Current @ VIN ≥ 2.7V 0.5µA Shutdown Mode 100kHz and 300kHz Switching Frequency Options • Programmable Soft-Start • 84% Typical Efficiency • Small Package: 5-Pin SOT-23A General Description The TC110 is a step-up (Boost) switching controller that furnishes output currents of up to 300mA while delivering a typical efficiency of 84%. The TC110 normally operates in pulse width modulation mode (PWM), but automatically switches to pulse frequency modulation (PFM) at low output loads for greater efficiency. Supply current draw for the 100kHz version is typically only 50µA, and is reduced to less than 0.5µA when the SH [ ... ]

TC110 PDF Datasheet Download