General Descriptions:
The CN3704 is a PWM switch-mode lithium ion battery charger controller for 4 cell li-ion battery in a small package using few external components.
The CN3704 is specially designed for charging lithium ion batteries with constant current and constant voltage mode. In constant voltage mode, the regulation voltage is fixed at 16.8V with ± 1% accuracy. The constant charging current is programmable with a single sense resistor.

FEATUREs:
● Wide Input Voltage: 7.5V to 28V
● Complete Charger Controller for 4
   cell Lithium-ion Battery
● Charge Current Up to 5A
● High PWM Switching Frequency:
   300KHz
● Constant Charging Voltage
   Accuracy: ± 1%
● Charging Current is programmed
   with a sense resistor
● Automatic Conditioning of Deeply
   Discharged Batteries
● End-of-Charge Current can be set
   by an external resistor
● Battery Temperature Monitoring
● Automatic Recharge
● Charger Status Indication
● 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:
● Notebook Computers
● Model Plane
● Battery-Backup Systems
● Portable Industrial and
   Medical Equipment
● Standalone Battery Chargers