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5A, Standalone Li-ion Battery Charger
Product Profile
   Application Note
General Description:
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.Deeply discharged batteries
are automatically trickle charged at 15% of the programmed constant charging current until the cell voltage exceeds
11.2V. The charge cycle is terminated once the charging current drops to a level set by an on-chip resistor and an
external resistor, and a new charge cycle automatically restarts if the battery voltage falls below 16V. CN3704 will
automatically enter sleep mode when input voltage is lower than battery voltage. Other features include undervoltage
lockout,battery temperature monitoring and status indication, etc.
CN3704 is available in a space-saving 16-pin TSSOP package.
Notebook Computers Model Plane
Battery-Backup Systems Portable Industrial and Medical Equipment
Standalone Battery Chargers
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
Application Note:
Application Note for TEMP
Quick Start of CN37XX Demo Board
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