Cxlb7482 is a constant current / constant voltage charger chip, which is mainly used for single lithium battery charging. There is no need for external detection resistor, and its internal structure is MOSFET structure, so there is no need for external reverse diode. The cxlb7482 can adjust the charging current to limit the chip temperature at high power and high ambient temperature. Its charging voltage is fixed at 4.2V, and the charging current can be adjusted by an external resistor. When the floating charge voltage is reached and the charging current drops to 1 / 10 of the setting circuit, the cxlb7482 automatically terminates the charging process. When the input voltage is removed, the cxlb7482 automatically enters the low current mode and draws less than 2ua of current from the battery. When the cxlb7482 enters standby mode, the power supply current is less than 25ua. The cxlb7482 can also monitor the charging current, has the characteristics of voltage detection and automatic cycle charging, and has an indicator pin to indicate the charging termination state and input voltage state.