The shape is adapted to the 21700 battery, which is very suitable for use in another open source project of mine, ip5389-3 string mobile power supply.
Just follow the parameters of each component in the bm3451 official specification, and there should be no big problem. The voltage resistance of the MOS tube should be at least 1.5 times greater than the battery voltage. The internal resistance depends on your wallet. If you have money, buy expensive low internal resistance tubes.
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