This tiny adjustable buck converter is $0.99 on eBay with free shipping from Hong Kong. I have no idea how they manage to make money. Anyway, it seems to work reasonably well. However I don't think it really can handle claimed 1.8A continuously since it was running at about 89 degrees C during my test (with 26 degrees C ambient). It is also quite noisy, but this was expected.
It is based on Monolithic Power Systems MP2307DN chip.
Datasheet: [ Ссылка ]
Electric vehicle charger project
part 1: [ Ссылка ]
part 2: [ Ссылка ]
