General Descriptions:
The CN3722(Note 1) is a PWM switch-mode battery charger controller that can be powered by photovoltaic cell with maximum power point tracking function. The CN3722 is specially designed for charging 1 or multi-cell lithium ion batteries or LiFePO4 batteries with constant current and constant voltage mode. In constant voltage mode, the regulation voltage is set by the external resistor divider. The constant charging current is programmable with a single current sense resistor.

FEATUREs:
● Photovoltaic Cell Maximum Power
   Point Tracking
● Wide Input Voltage: 7.5V to 28V
● Complete Charger Controller for 1
   or multi-cell Lithium-ion Battery or
   LiFePO4 Battery
● Charge Current Up to 5A
● High PWM Switching Frequency:
   300KHz
● Constant Charging Voltage Set By
   the External Resistor Divider
● Charging Current is programmed
   with a sense resistor
● Automatic Conditioning of Deeply
   Discharged Batteries
● Battery Temperature Monitoring
● 2 Status Indications
● Soft Start
● Battery Overvoltage Protection
● Operating Ambient Temperature
   － 40℃ to ＋85℃
● Available in 16 Pin TSSOP Package
● Pb-free , RoHS Compliant,
   and Halogen Free

APPLICATIONs:
● The Charger Powered by Photovotaic cell
● Electric Tools
● Battery-Backup Systems
● Standalone Battery Chargers