Cxlb7263b is a PWM mode single lithium battery charging management integrated circuit, which independently manages the charging of a single lithium battery. It has the advantages of small footprint, few peripheral components and simple use. With trickle, constant current and constant voltage charging modes, cxlb7263b is very suitable for lithium battery charging management. In the constant voltage charging mode, the cxlb7263b modulates the battery voltage to 4.2V, which can also be adjusted upward through an external resistance; in the constant current charging mode, the charging current is set through an external resistance. The internal adaptive circuit can automatically adjust the charging current according to the current output capacity of the input power supply. The user does not need to consider the worst case, and can maximize the current output capacity of various input power supplies, which is very suitable for the application of power supply with limited current output capacity such as USB interface. For deep discharge lithium battery, when the battery voltage is lower than 66.5% of the constant voltage charging voltage (typical value), cxlb7263b uses 17.5% of the constant current charging current set to charge the battery trickle. In the constant voltage charging stage, the charging current decreases gradually. When the charging current decreases to 16% of the constant current charging current, the charging ends. At the end of charging state, if the battery voltage drops to 95.5% of the constant voltage charging voltage, a new charging cycle will start automatically. When the input power is off or the input voltage is lower than the battery voltage, the cxlb7263b will automatically enter the sleep mode. Other functions include input low voltage latch, battery terminal over-voltage protection and charging status indication