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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
- LDO
- Amplifiers
CN3791
4A, Standalone Li-ion Battery Charger IC
With Photovoltaic Cell MPPT Function
Product Profile
    Application Note
General Description
The CN3791 is a PWM switch-mode lithium ion battery charger controller that can be powered by photovoltaic
cell with maximum power point tracking function with few external components.
The CN3791 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.
The constant charge current is programmable with a single current sense resistor.Deeply discharged batteries
are automatically trickle charged at 17.5% of the full-scale current until the cell voltage exceeds 66.5% of
constant voltage. The charge cycle is terminated once the charge 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,CN3791 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.
CN3791 is available in a space-saving 10-pin SSOP package.
Applications
Power Bank Portable Industrial and Medical Equipment
Hand-held Equipment Standalone Battery Chargers
Battery-Backup Systems
Features
Photovoltaic Cell Maximum Power Point Tracking
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
Constant Voltage: 4.2V1%
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 CN3767/CN3801/CN3791 Demo Board
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