How about the lithium battery charge management chip SMC401?

The charging of the SMC401 is divided into three phases: pre-charge, constant current charging and constant voltage charging.

(1) Pre-charge stage

After installing the battery and adding power, the SMC401 first checks if the battery temperature is within the set range. If it is not normal, it enters the temperature failure mode. Otherwise, the battery voltage VBAT is detected. When the battery voltage VBAT is lower than the low voltage threshold VLOW, the SMC401 is constant. A current of 10% is used to pre-charge the battery.

(2) Constant current charging stage

When the battery is pre-charged or the battery voltage VBAT is higher than VLOW and lower than VMAX, the SMC 401 enters a constant current state of charge, at which time the charging current is monitored by the voltage drop across the external sense resistor.

(3) Constant voltage charging stage

When the battery voltage VBAT reaches VMAX, it enters a constant voltage state of charge. The constant voltage accuracy is higher than ±1% over the entire operating temperature and operating voltage range. The charging is stopped when the charging current reaches the termination threshold ILOW, and the constant voltage charging is automatically started when the battery voltage is lower than the recharging threshold voltage VMAX.

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