This part is a kind of semiconductor called MC34063A.

Function of this product has DC-DC Converter Control Circuits.

Manufacturers : HTC

Image and pinout :

Some of the text within the PDF file :

DC-DC Converter Control Circuits MC34063A ● OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A ● 2% REFERENCE ACCURACY ● LOW QUIESCENT CURRENT:2.5mA(TYP.) ● OPERATING FROM 3V TO 40V ● REQUENCY OPERATION TO 100KHz ● ACTIVE CURRENT LIMITING DESCRIPTION The MC34063A series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. The device contains an intermal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit driver and high current output switch. Output voltage is adjustable through two external resistors with a 2% reference accuracy. Employing a minimum number of external components the MC34063A devices series is designed for Step-Down, Step-Up and Voltage-lnverting applications. 8 SOP/ [ ... ]

MC34063A PDF Datasheet Download