1、Module description: LM1117 is a low dropout voltage regulator series. Its differential pressure in the 1.2V output, the load current is 1.2V when the load current is 800mA. It has the same tube feet as the national semiconductor industrial standard device LM317. LM1117 has an adjustable voltage version, through 2 external resistors can be achieved 1.25 ~ 13.8V output voltage range. In addition, there are 5 fixed voltage output (1.8V, 2.5V, 2.85V, 3.3V and 5V) model. LM1117 provides current limiting and thermal protection. The circuit includes a bandgap reference voltage of 1 Zener regulation to ensure the accuracy of output voltage is less than 1%. 2、Function Description: Realization of 3.3V to 5V voltage regulator. 3、Description of each function module: ![enter image description here][1] 4、Components and PCB diagram before welding: ![enter image description here][2] 5、Physical map after welding: ![enter image description here][3] ![enter image description here][4] ![enter image description here][5] [1]: /editor/20160418/57143802d253d.png [2]: /editor/20160418/5714389f3765d.png [3]: /editor/20160503/57284679e5342.JPG [4]: /editor/20160503/5728467da8890.JPG [5]: /editor/20160503/5728468106efe.JPG