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Product Information
Your Position £ºProduct
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- Voltage detector IC ¡¡
- Reset IC ¡¡
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- 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
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- Amplifiers
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CN3705
5A, Multi-Chemistry Battery Charger
Product Profile
    Application Note
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General Description£º
The CN3705 is a PWM switch-mode battery charger controller for 1 or multi-cell lithium ion batteries or LiFePO4
batteries in a small package using few external components.The CN3705 is specially designed for charging
lithium ion batteries or LiFePO4 batteries with constant current and constant voltage mode. In constant voltage
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 15% of the programmed
constant charging current until the cell voltage exceeds 66.7% of the regulation voltage in constant voltage mode.
The charge cycle is terminated once the charging current drops to a level set by an on-chip resistor and an external
resistor, and a new charge cycle automatically restarts if the battery voltage falls below 91.1% of the regulation
voltage in constant voltage mode. CN3705 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.
CN3705 is available in a space-saving 16-pin TSSOP package.
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Applications£º
LiFePO4 Battery Charger Electric Tools
Battery-Backup Systems Portable Industrial and Medical Equipment
Standalone Battery Chargers
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Features£º
Wide Input Voltage: 7.5V to 28V
Complete Charger Controller for 1 or multi-cell Lithium-ion Battery or LiFePO4 Battery
Charge Current Up to 5A
High PWM Switching Frequency: 300KHz
Constant Charging Voltage Set By the External Resistor Divider
Charging Current is programmed with a sense resistor
Automatic Conditioning of Deeply Discharged Batteries
End-of-Charge 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
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Application Note£º
Application Note for TEMP
Quick Start of CN37XX Demo Board
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