Cxlb7397 is a PWM Buck mode multi battery charging management integrated circuit which can use solar panel to supply power. It can manage multi battery charging independently. It has the advantages of small footprint, few peripheral components and simple use. With trickle, constant current and constant voltage charging modes, cxlb7397 is very suitable for lithium battery, lithium iron phosphate battery and lithium titanate battery charging management. In constant voltage charging mode, cxlb7397 modulates the battery voltage to the voltage set by the external feedback resistor; in constant current charging mode, the charging current is set by an external resistor. When the solar panel is used for power supply, the internal circuit can automatically track the maximum power point of the solar panel. The user does not need to consider the worst case, and can maximize the output power of the solar panel, which is very suitable for the application of solar panel power supply. For deep discharge lithium battery, when the battery voltage is lower than 66.5% of the constant voltage charging voltage (typical value), 17.5% of the constant current charging current set by cxlb7397 will trickle charge the battery. 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, if the charging current rises to more than 58.8% of the constant current charging current, a new charging cycle will start automatically. When the input power supply is powered down or the input voltage is lower than the battery voltage, cxlb7397 moves into sleep mode. Other functions include input low voltage latch, battery terminal over-voltage protection and charging status indication.