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- Voltage detector IC
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4A, Standalone Li-ion Battery Charger
Product Profile
    Application Note
General Description
The CN3761 is a PWM switch-mode lithium ion battery charger controller for 1 cell li-ion battery in a small package
using few external components. The CN3761 is specially designed for charging lithium ion batteries with constant
current and constant voltage mode. In constant voltage mode, the regulation voltage can be fixed at 4.2V with
1% accuracy, also can be adjusted upward with an external resistor. The constant charging current is programmable
with a single current sense resistor. Deeply discharged batteries are automatically trickle charged at 17.5% of the
programmed constant charging current until the cell voltage exceeds 66.5% of constant voltage. The charge
cycle is terminated once the charging current drops to 16% of full-scale current, and a new charge cycle
automatically restarts if the battery voltage falls below 95.5% of regulation voltage. CN3761 will automatically
enter sleep mode when input voltage is lower than battery voltage.
Other features include under voltage lockout,battery over voltage protection, status indication,etc.
CN3761 is available in a space-saving 10-pin SSOP package.ge.
Power Bank Hand-held Equipment
Battery-Backup Systems Portable Industrial and Medical Equipment
Standalone Battery Chargers
Wide Input Voltage: 4.5V to 28V
Complete Charge Controller for single cell Lithium-ion Battery
Charge Current Up to 4A
High PWM Switching Frequency: 300KHz
Regulation Voltage can be adjusted upward
Constant Voltage Accuracy: 1%
Charging Current is programmed with a current sense resistor
Automatic Conditioning of Deeply Discharged Batteries
Automatic Recharge
Charging Status Indication
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature 40 to 85
Available in 10 Pin SSOP Package
Pb-free,Rohs-Compliant,Halogen Free
Application Note
Quick Start of CN376X Demo Board
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