Module use: use single lithium power supply, automatic buck-boost IC: RT6150BGQW, stable output 3V3, also configured IP5305 mobile power IC to charge lithium battery, plus lithium battery protection ICXB5353A to add battery protection

Power size:

Input voltage range: 1.8V-5.5V

Input and output current range: <= 800MA

Output voltage: fixed 3.3V

With 4 LEDs to display power, there are buttons to briefly activate the LED to obtain power

The module is small in size, affordable, the required components are common, and the cost performance is high

The battery protection chip should have all the functions, over-discharge voltage detection 2.7V