This part is a kind of semiconductor called L5973D.

Function of this product has 2.5A SWITCH STEP DOWN SWITCHING REGULATOR.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

L5973D 2.5A SWITCH STEP DOWN SWITCHING REGULATOR s s s s s s s s s s s s s 2.5A INTERNAL SWITCH OPERATING INPUT VOLTAGE FROM 4.4V TO 36V 3.3V / (±2%) REFERENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM 1.235V TO 35V LOW DROPOUT OPERATION: 100% DUTY CYCLE 250KHz INTERNALLY FIXED FREQUENCY VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION INTERNAL CURRENT LIMITING INHIBIT FOR ZERO CURRENT CONSUMPTION SYNCHRONIZATION PROTECTION AGAINST FEEDBACK DISCONNECTION THERMAL SHUTDOWN HSOP8 - EXPOSED PAD ORDERING NUMBER: L5973D DESCRIPTION The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5A so it is able to deliver more than 2A DC current to the load depending on the application conditions. The output voltage can be set from 1.235V to 35V. The high [ ... ]

L5973D PDF Datasheet Download