There are no recommendations for replacing IR36021.
Use as Layerscape communications processor board schematic.
For example see the LS1088ARDB schematic:
https://www.nxp.com/downloads/en/printed-circuit-boards/LS1088ARDB-PB-DF.zip
This board uses the LTC3882 as buck converter.
Have a great day,
Pavel Chubakov
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