The AMS1117 is a low-dropout (LDO) linear voltage regulator available in fixed 1.8V, 2.5V, 3.3V, 5V, and adjustable versions. It provides 1A output with only 1.1–1.3V dropout, popular on USB-powered boards.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | ADJUST/GND | Ground for fixed, adjust for variable | GND |
| 2 | OUTPUT | Regulated output voltage | PWR |
| 3 | INPUT | Unregulated input | PWR |