PDF named after the TI TPS2544, about 1.28 MB, catalogued as a schematic, though the name points to documentation for that USB charging port controller and power switch. The TPS2544 supplies current-limited power to a USB port and handles charging-mode signalling for phones and tablets. A technician uses its pinout and application circuit to check enable, fault and current limit pins when a USB port gives no power or charges poorly. Verify the part marking on the board before relying on 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 @one5technology. 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.