Cxlb7251c is a perfect linear power management chip with constant current and constant voltage for lithium-ion battery. Its thin size and small outer package make it convenient for portable application. What's more, cxlb7251c is specially designed for USB power supply. Due to the internal MOSFET structure, external resistors and blocking diodes are not needed in application. In high energy operation and high peripheral temperature, thermal feedback can control the charging current to reduce the chip temperature. The charging voltage is limited to 4.2V, and the charging current is regulated by external resistance. After reaching the target charging voltage, when the charging current drops to 1 / 10 of the set value, the cxlb7251c will automatically end the charging process. When the input terminal (plug or USB power supply) is unplugged, the cxlb7251c will automatically enter the low current state, and the battery leakage current will drop below 2 μ a. The CXLB7251C can also be set in A stop state to reduce the power supply current to 25 μ a. Other features include: charging current monitoring, input low-voltage locking, input high-voltage locking, automatic recharging and charging full and start charging signs.