Open source-18650 boost 5V board

Project introduction: 18650 boosts 5V, the maximum output current is 800ma, which is enough for general applications. It uses the synchronous rectifier boost chip FP6276. The output has LED indication and EN output control switch. This design is used for another open source project of mine. For power supply of STC51 offline downloader. Circuit introduction: The red circle 1 is the 18650 lithium battery socket and the filter capacitor circuit. Inside the red circle 2 is the 5V output EN output switch. When the four pins of the U1 chip are at high potential, they output 5V voltage. When they are at low potential, they turn off the 5V output. The red circle 3 is the boost power inductor. The red circle 4 is the output voltage sampling feedback due to adjusting the output voltage. Inside the red circle 5 are the output indication diode and filter capacitor. The indication diode is highlighted, so the current limiting resistor is relatively large.     Below are photos of the empty PCB board and after soldering the components: