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Product Information
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5A, Lead-Acid Battery Charger IC
Product Profile
    Application Note
General Description£º
The CN3717 is a PWM switch-mode battery charger controller for lead-acid battery in a small package using few
external components. The CN3717 is specially designed for charging lead-acid battery with trickle charge,
constant current charge, over-charge and float charge mode. In over-charge and float charge mode, the regulation
voltage is set by the external resistor divider. The constant charging current is programmable with a single sense
resistor. Deeply discharged batteries are automatically trickle charged at 19% of the programmed constant
charging current until the cell voltage exceeds 75.6% of the regulation voltage in over-charge mode. The
over-charge is terminated once the charging current drops to a level set by an on-chip resistor and an external
resistor, then CN3717 will enter into float charge mode. A new charge cycle automatically restarts if the battery
voltage falls below 82.2% of the over-charge voltage in float-charge mode. CN3717 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.
CN3717 is available in a space-saving 16-pin TSSOP package.
Lead-Acid Battery Charger UPS
Standalone Battery Chargers Portable Industrial andMedical Equipment
Wide Input Voltage: 7.5V to 28V
Complete Charger Controller for Lead-Acid Battery
Charge Current Up to 5A
High PWM Switching Frequency: 300KHz
Over-Charge Voltage Set By the External Resistor Divider
Charging Current is programmed with a sense resistor
Automatic Conditioning of Deeply Discharged Batteries
Over-charge Termination 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¡æ to £«85¡æ
Available in 16 Pin TSSOP Package
Pb-free , RoHS Compliant,and Halogen Free
Application Note£º
Quick Start of CN37XX Demo Board
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