PDF datasheet for the ISL6257, a 493 KB document whose name carries only the part number. The ISL6257 is an Intersil battery charger controller found in many older laptops, so the sheet is useful for checking pinout, sense-resistor placement, the ACIN and enable logic, and typical application circuits when a board will not charge or fails to pass adapter power. Compare the marking on the chip with the exact part number before measuring pins, as suffixes can change the package or features.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.