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4A,12V Lead-Acid Battery Charger IC
Product Profile
    Application Note
General Description
The CN3768 is a PWM switch-mode battery charger controller for 12V lead-acid battery in a small package
using few external components.
The CN3768 is specially designed for charging 12V 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
internally set. The constant charge current is programmable with a single sense resistor.
Deeply discharged batteries are automatically trickle charged at 17.5% of the programmed constant charge
current until the cell voltage exceeds 75% of the regulation voltage in over-charge mode. The over-charge
is terminated once the charging current drops to 38% of the constant charge current, then CN3768 will enter
into float charge mode. A new charge cycle automatically restarts if the battery voltage falls below 83.95%
of the over-charge voltage in float-charge mode. CN3768 will automatically enter sleep mode when input
voltage is lower than battery voltage.
Other features include undervoltage lockout and status indication, etc.
CN3768 is available in a space-saving 8-pin SOP package.
Lead-Acid Battery Charger Portable Industrial and Medical Equipment
UPS Standalone Battery Chargers
Wide Input Voltage: 6.6V to 30V
Complete Charger Controller for 12V Lead-Acid Battery
Charge Current Up to 4A
High PWM Switching Frequency: 300KHz
Fixed Over-Charge Voltage
Charging Current is programmed with a sense resistor
Automatic Conditioning of Deeply Discharged Batteries
Automatic Recharge
Charger Status Indication
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature: 40 to 85
Available in 8 Pin SOP Package
Pb-free , RoHS Compliant, and Halogen Free
Application Note
Quick Start of CN3768 Demo Board
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