This part is a kind of semiconductor called L6728A.

Function of this product has High frequency single phase PWM controller.

Manufacturers : STMicroelectronics

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Some of the text within the PDF file :

L6728A High frequency single phase PWM controller with Power Good Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Flexible power supply from 5 V to 12 V Power conversion input as low as 1.5 V 0.8 V internal reference 0.8 % output voltage accuracy High-current integrated drivers Power Good output Sensorless and programmable OCP across low-side RDS(on) OV / UV protections VSEN disconnection protection Oscillator internally fixed at 600 kHz LS-LESS to manage pre-bias start-up Adjustable output voltage Disable function Internal soft-start VFDFPN 10 package VFQFPN 10 Description L6728A is a single-phase step-down controller with integrated high-current drivers that provides complete control logic and protection to realize in a simple way general DC-DC [ ... ]

L6728A PDF Datasheet Download