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PFM Step-up Battery Charger Controller IC
Product Profile
      Application Note
General Description:
CN3304 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 4-cell lithium battery charge management with fewer external components. CN3302 adopts constant current and quasi-constant voltage(Quasi-CVTM) mode to charge battery.
On power up, CN3304 enters charging state, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper limit, 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 limit, the N-channel MOSFET is turned on again. When BAT pin voltage reaches 16.8V(Typ.) for the first time, CN3304 enters quasi-CV mode, in which the charge current is reduced. The charge process is only terminated when BAT voltage reaches 12.6V for the second time. In termination mode, the external N-channel MOSFET is turned off. When BAT voltage falls below recharge threshold, the CN3304 enters charge mode again. CN3304’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, CN3304 will increase the off time to 5us to reduce the charge current as a purpose of battery protection with the joint action of external N-channel and P-channel MOSFET.
The other features include chip enable input, status indication, etc.
CN3304 is available in 8-pin SOP package.
4-Cell Lithium Battery Charge Management POS, Electric Fan
Audio System Standalone battery charger
Input Voltage Range:2.7V to 6.5V
Operating Current:280uA@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:-40℃ to 85℃
Available in SOP8 Package
Lead-free, rohs-Compliant and Halogen Free
Application Note:
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