General Descriptions:
The CN3791 is a PWM switch-mode lithium ion battery charger controller that can be powered by photovoltaic cell with maximum power point tracking function with few external components.
The CN3791 is specially designed for charging lithium ion batteries with constant current and constant voltage mode. In constant voltage mode, the regulation voltage can be fixed at 4.2V with ± 1% accuracy. The constant charge current is programmable with a single current sense resistor.

FEATUREs:
● Photovoltaic Cell Maximum Power Point
   Tracking
● Wide Input Voltage: 4.5V to 28V
● Complete Charge Controller for single
   cell Lithium-ion Battery
● Charge Current Up to 4A
● High PWM Switching Frequency:
   300KHz
● Constant Voltage: 4.2V± 1%
● Charging Current is programmed with a
   current sense resistor
● Automatic Conditioning of Deeply
   Discharged Batteries
● Automatic Recharge
● Charging Status Indication
● Soft Start
● Battery Overvoltage Protection
● Operating Ambient Temperature
   － 40℃ to ＋85℃
● Available in 10 Pin SSOP Package
● Pb-free, Rohs-Compliant, Halogen Free

APPLICATIONs:
● Power Bank
● Hand-held Equipment
● Battery-Backup Systems
● Portable Industrial and Medical Equipment
● Standalone Battery Chargers