General Descriptions:
The CN3705 is a PWM switch-mode battery charger controller for 1 or multi-cell lithium ion batteries or LiFePO4 batteries in a small package using few external components.
The CN3705 is specially designed for charging 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 sense resistor.

FEATUREs:
● 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
● 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:
● LiFePO4 Battery Charger
● Electric Tools
● Battery-Backup Systems
● Portable Industrial and
   Medical Equipment
● Standalone Battery Chargers