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PFM Step-up Multi-cell NIMH Battery Charger IC
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General Description:
CN3387 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 NIMH battery charge management with fewer external components. CN3387 adopts constant current and maintenance mode to charge battery.
On power up, CN3387 enters constant current 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, then 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 rises to 1.124V (Typ.) , CN3387 enters maintenance mode, in which the input current is reduced, in the meantime a timer is started. The charge process will not be terminated until the time out occurs. In termination mode, the N-channel MOSFET is turned off. When FB pin voltage falls below recharge threshold, the CN3387 enters charge mode again. CN3387’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, CN3387 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 chip enable input, status indication, etc.
CN3387 is available in 10-pin SSOP package.
Standalone NIMH Battery Charger Electric Tools
Toys Car Models, Aero-modeling
Input Voltage Range:2.7V to 6.5V
Maintenance Charge Mode to Guarantee Fully-charged Battery
Charging terminated by Timer
Charge Current up to 1A
Automatic Recharge
Output Power up to 35W
Indicators for Charge and termination status
Protection for Low Battery Voltage and Short Battery
Chip Enable Input
Battery Overvoltage Protection
Available in SSOP10 Package
Pb-free, rohs compliant and Halogen free
Application Note:
Quick Start of CN3387 Demo Board
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