1117 is LDO, that is, low voltage difference linear regulator, 1117 in the market there are many specifications, most of them are 600mA to 700mA, AMS,AMC in the market most of them are fake, the current domestic best is BM1117, full 1A, high cost performance.
LDO, the voltage conversion, such as AMS1117-3.3, is to convert 5V to 3.3V, and AMS1117-1.8 is to convert 5V to 1.8V