Solar MPPT power panel

The CN3722 (Note 1) is a PWM buck charging management IC that can be powered by a solar cell and features solar cell maximum power point tracking. The CN3722 is ideal for charging single or multi-cell lithium-ion or lithium iron phosphate batteries, offering advantages such as small package size, fewer external components, and ease of use. The CN3722 features constant current and constant voltage charging modes, making it ideal for charging lithium-ion or lithium iron phosphate batteries. In constant voltage charging mode, the constant voltage is set by an external resistor divider network; in constant current charging mode, the charging current is set by an external resistor. For deeply discharged batteries, when the battery voltage is below 66.7% of the set constant voltage, the CN3722 trickles the battery with 15% of the set constant current. During constant voltage charging, the charging current gradually decreases, and charging ends when the charging current decreases to 9.5% of the set constant current. When the input power supply fails or the input voltage is lower than the battery voltage, the CN3722 automatically enters a low-power sleep mode. Other features include input low voltage latch-up, battery temperature monitoring, battery overvoltage protection, and charging status indication. The CN3722 is packaged in a 16-pin TSSOP package.