Product Information
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- Voltage detector IC
- Reset IC
- Li+ Battery Charger IC
- Coin Battery Charger IC
- LA Battery Charger IC
- LiFePO4 Battery Charger IC
- Solar Panel-Powered Charger IC
- NIMH Battery Charger IC
- Li+ Titanate Battery Charger IC
- WLED Driver
- DC-DC Converter
- Amplifiers
4A, Multi-Chemistry Battery Charger
Product Profile
    Application Note
General Description
The CN3765 is a PWM switch-mode multi-chemistry battery charger controller in a small package using few
external components. The CN3765 is specially designed for charging lithium ionLiFePO4 or Lithium Titanate
batteries with constant current and constant voltage mode. In constant voltage mode, the regulation voltage
is set by 2 external resistors. The constant charging current is programmable with a single current sense
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
charge current rises above 58.8% of full-scale charge current.
CN3765 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.
CN3765 is available in a space-saving 10-pin SSOP package.
Hand-held Equipment Portable Industrial and Medical Equipment
Battery-Backup Systems Standalone Chargers for Lithium ion,LiFePO4 or Lithium Titanate Batteries
Wide Input Voltage: 6.6V to 30V
Complete Charge Controller for Singleor Multi-cell Lithium ion, LiFePO4 or Lithium Titanate Batteries
Charge Current Up to 4A
High PWM Switching Frequency:310KHz
Can be used as Voltage Source when Battery is Absent
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 CN3765 Demo Board
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