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by algaeontoast 2504 days ago
There are actually quite a few well-developed IC's specifically intended for this application. They act both as buck converters for the output device, BMS for the lithium cell / cells, and a charge controller for the cells.

Andreas Spies has a great video on comparing some modern IC's for this -> https://www.youtube.com/watch?v=KaiQDS9jObY