In summary, the ISL85003/ISL85003A are synchronous buck regulators with integrated high-side and low-side FETs. This device provides a compact solution with a low BOM cost because it has the integrated high-side and low-side FETs, integrated bootstrap diode, internal compensation, and an internal soft-start, all in a very compact 4 X 3 DFN package. The primary difference between the ISL85003 and ISL85003A is the functionality of pin 1; pin 1 on the ISL85003 is used for external synchronization (up to 2MHz) and pin 1 on the ISL85003A is used to adjust soft-start time. This part is able to automatically switch from CCM to DCM at light load to provide improved efficiency, the built-in negative current protection helps to improve reliability, and it can support pre-biased output. Additional information for the ISL85003 and ISL85003A including the datasheet, application notes, schematics, and Gerbers, are all available online.