Cxlb7440b is a management chip specially used for mobile power supply. It is composed of 1A linear lithium charging module, 5V / 1A boost power module, electricity display module and integrated control and protection module. It integrates many functions such as electricity indicator, flashlight, key control, lithium charging management, lithium discharge control and lithium undervoltage protection. The cxlb7440b is charged in a linear way, including the charging process of trickle charging, constant current charging and constant voltage charging. The floating charge voltage accuracy can reach ?1%. The DC-DC boost of cxlb7440b can provide up to 90% boost conversion efficiency, and can continuously output 1A current. The cxlb7440b is equipped with four LEDs for power or fault indication, and each port can output up to 8Ma current. At the same time, cxlb7440b is also equipped with a key control port. Double click (within 1s) to control the flashlight, click to start the discharge circuit, and long press to close the discharge output. The cxlb7440b has multiple protection designs, including load over-current protection, load short-circuit protection, input short-circuit current limiting protection, and the chip port has designed a high-performance ESD protection circuit, which makes the chip highly reliable