toothache

Single cell 3.7V lithium battery charging and discharging step-down 3.3V input MCU solution

Overview

Pay attention to the instructions on the schematic diagram. In some places, such as the digital transistor DTC143ECA pin, I have verified that it is directly connected to high level. In actual use, it can be controlled by the microcontroller pin. If power consumption is considered, when this pin is low level, the detection The circuit will be disconnected to save power.
In practical applications, the lithium battery interface can be directly welded, and the two voltage detection pads can also be removed, saving a lot of space.
Note that in actual application, the 10K resistor in front of the ADC pin of the detection circuit must be removed.

Design Files

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