Cxlb73156 is a perfect single-chip lithium-ion battery constant current / constant voltage linear power management chip. Its thin size and small outer packaging make it suitable for portable applications. What's more, cxlb73156 is specially designed for USB power supply specifications. Due to the internal MOSFET structure, external resistors and blocking diodes are not needed in application. The charging voltage is limited to 4.2V, and the charging current is regulated by external resistance. After the target charging voltage is reached, when the charging current drops to 1 / 10 of the set value, the cxlb73156 will automatically end the charging process. When the input terminal (plug or USB power supply) is unplugged, the cxlb73156 will automatically enter the low current state, and the battery leakage current will drop below 1 μ a. Cxlb73156 can also be set to stop working state to reduce the power supply current to 40 μ a. The unique internal patent structure of cxlb73156 ensures that the chip will automatically enter the protection state when the battery is connected reversely, and ensures that the IC will not be broken down, leading to battery self discharge accidents. At the same time, ensure that the ESD capacity of cxlb73156 reaches 6kV (HBM). Other features include: charging current monitoring, input low-voltage blocking, automatic recharging and charging full and start charging signs.