Simple charging management circuit diagram of lithium-ion battery pack

As shown in the figure is a lithium battery charging management circuit.

It is mainly composed of a lithium battery charging management chip TP4056 and external discrete devices.

TP4056 is a chip developed for single-cell lithium battery charging and management. It only requires a few external discrete components to build and complete. Therefore, it is often directly made into electronic modules for sale by major electronic distributors, which greatly facilitates various electronics Used by enthusiasts.

Introduction to TP4056

TP4056 is a complete single-cell lithium-ion battery with stable current/stable voltage linear charger. The SOP8 package with a heat sink on the bottom and a small number of external components make the TP4056 an ideal choice for portable use. TP4056 can be suitable for USB power supply and adapter power operation.

Due to the internal PMOSFET architecture and the anti-reverse charging circuit, no external blocking diode is required. The thermal response can actively adjust the charging current to constrain the chip temperature under high-power operation or high ambient temperature conditions. The charging voltage is fixed at 4.2V, and the charging current can be set externally through a resistor. When the charging current drops to 1/10 of the set value after reaching the final float voltage, TP4056 will actively stop the charging cycle.

When the input voltage (communication adapter or USB power supply) is removed, the TP4056 actively enters a low current state, reducing the battery leakage current to less than 2uA. TP4056 can also be placed in shutdown mode when there is power supply, so as to reduce the supply current to 55uA. Other features of the TP4056 include battery temperature detection, under-voltage lockout, active recharging and two LED status pins to indicate charging and completion.