View la5621v datasheet:

Ordering number :EN5640A Monolithic linear IC LA5621M, 5621V Lithium-Ion Battery Charge Control IC • Countercurrent detection and control: Overview In systems that support charging of both the set of the The LA5621M and LA5621V are external charge control video camera, etc., and the AC adapter/charger, when ICs for lithium-ion batteries. These ICs are ideally suited spare batteries are charged on the AC adapter/charger for on/off control of external power MOSFETs in systems side, if the battery voltage on the set side becomes high that incorporate a charging circuit in the set. They detect when the set is connected to the AC adapter/charger, the charge and discharge status, output it to the set control current flows out to the battery on the AC microcontroller, which then