| CN3304 |
| PFM Step-up Battery Charger Controller IC |
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| General Description： |
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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. |
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| Applications： |
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4-Cell Lithium Battery Charge Management |
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POS, Electric Fan |
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Audio System |
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Standalone battery charger |
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| Features： |
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Input Voltage Range：2.7V to 6.5V |
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Operating Current：280uA@VIN=5V |
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Inductor Current Detection |
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Switching Frequency up to 1MHz |
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Quasi-CV mode to Compensate for the Voltage Loss
on Battery Internal Resistance and Trace Resistance |
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Automatic Recharge |
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Output Power up to 35W |
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Protection for Battery Voltage Being Low than
Input and Short Battery |
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Good adaptability to Input Supply with Limited
Driving Capability |
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Chip Enable Input |
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Battery Overvoltage Protection |
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Status Indication |
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Operating Temperature Range：－40℃ to 85℃ |
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Available in SOP8 Package |
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Lead-free, rohs-Compliant
and Halogen Free |
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Application
Note： |
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