Cxlb7244 is a complete single lithium-ion battery with constant current / constant voltage linear charger. Its sot package and a small number of external components make the cxlb7244 an ideal choice for portable applications. The cxlb7244 can work with USB power and adapter power. Due to the internal PMOSFET architecture and anti reverse charging circuit, external detection resistor and isolation diode are not needed. Thermal feedback can adjust the charging current to limit the chip temperature under high power operation or high ambient temperature. The charging voltage is fixed at 4.2V, and the charging current can be set externally through a resistor. When the charging current drops to 1 / 10 of the setting value after reaching the final floating charge voltage, the cxlb7244 will automatically terminate the charging cycle. When the input voltage (AC adapter or USB power supply) is removed, cxlb7244 automatically enters a low current state, reducing the battery leakage current to less than 1uA. The cxlb7244 can also be placed in shutdown mode to reduce the supply current to 25ua. Other features of the cxlb7244 include a charging current monitor, an undervoltage lockout for automatic recharging, and a status pin to indicate the end of charging and input voltage access.