ON Semiconductor NCP81218 datasheet, saved as a 379 KB PDF with a copy suffix in the name. NCP81 series chips are power controllers found on laptop motherboards, commonly in CPU or graphics voltage regulator circuits. The document lets you identify enable, power-good, feedback and switching pins so you can check why a rail is missing or a converter is not starting. Confirm the chip marking on the board matches this part and check the package section, as pin numbering depends on the package used.
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.