What about the lithium battery charging management chip TP4056?

TP4056 is a complete single section lithium ion batteries using constant current/constant voltage linear charger. The bottom with a heat sink SOP8 encapsulation and less number of external components makes TP4056 ideal for portable applications.TP4056 can work for USB power supply and adapter power supply.

With internal PMOSFET architecture, coupled with the charging way, so don't need external isolation diodes. Thermal feedback can be automatically adjust the charging current, so that under the condition of high power operation or high ambient temperature of chip temperature limit. Fixed at 4.2 V, charging voltage and charging current through a resistor to external Settings. When the charging current is reached the final float charging voltage to set data after 1/10, TP4056 will automatically terminate charging cycle.

When the input voltage (ac adapter or USB power supply) is removed, the TP4056 automatically entered into a state of low current, will be the battery leakage current dropped to under 2 ua.TP4056 when power can also be in stop mode, and has reduced the power supply current to 55 ua.TP4056 other features include battery temperature detection, undervoltage lockout, automatic recharge and two used to indicate the charging state, the end of the LED pin.

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