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Product Information
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PFM Step-up Multi-cell Battery Charger IC
Product Profile
      Application Note
General Description£º
CN3305 is a PFM mode step-up battery charge management IC with operating voltage range between 2.7V to 6.5V. It is specially designed for multi-cell lithium-ion, LiFePO4 and Lead Acid battery charge management with fewer external components. CN3305 adopts constant current and quasi-constant voltage(Quasi-CVTM) mode to charge battery.
On power up, CN3305 enters charging mode, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper threshold, the N-channel MOSFET is turned off, inductor is discharged, the energy stored in inductor is transferred to battery. When the inductor current is discharged to its lower threshold, the N-channel MOSFET is turned on again. When FB pin voltage reaches 1.205V(Typ.) for the first time, CN3305 enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until FB voltage reaches 1.205V for the second time. In termination mode, the N-channel MOSFET is turned off. When FB voltage falls below recharge threshold, the CN3305 enters charge mode again. CN3305¡¯s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.
If battery voltage is lower than input voltage by a diode drop, CN3305 will increase the off time to 5us to reduce the charge current as a protection for battery with the joint action of external N-channel and P-channel MOSFET.
The other features include status indication, etc.
CN3305 is available in 8-pin SOP package.
Lithium-ion,LiFEPO4 and Lead-Acid Battery Power Bank
Audio System Standalone battery charger
Electric Appliance ¡¡ ¡¡
Input Voltage Range£º2.7V to 6.5V
Operating Current£º280uA@VIN=5V
Inductor Current Detection
Switching Frequency up to 1MHz
Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance
Automatic Recharge
Output Power up to 35W
Protection for Battery Voltage Being Low than Input and Short Battery
Good adaptability to Input Supply with Limited Driving Capability
Chip Enable Input
Battery Overvoltage Protection
Status Indication
Operating Temperature Range£º£­40¡æ to 85¡æ
Available in SOP8 Package
Lead-free, rohs-Compliant and Halogen Free
Application Note£º
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