Datasheet in PDF form for the AOZ5019QI, identified only by its part number. The 611 KB document should cover pinout, electrical ratings, typical application circuit and package details. Repair technicians open such sheets to learn which pin is the enable, power-good or switching node, what voltages to expect at each one, and how the surrounding components are meant to be wired. Comparing measurements on a suspect chip with the datasheet values helps decide whether the part or its load is the cause of a short or a missing rail. Any PDF reader opens it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ic_mosfet_pdf_datasheets. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.