Funtion：PFM Step-up 2-cell Lithium Battery Charger IC
Vin Range：2.75V - 6.5V
Solar Panel charge：Yes
Chip Temperature Regulation：Yes
On-chip Power MOSFET：No
CN3382 is a PFM mode step-up battery charge management IC with operating voltage range between 2.75V to 6.5V. It is specially designed for 2-cell lithium battery charge management with fewer external components. CN3382 adopts constant current and quasi-constant voltage(Quasi-CVTM) mode to charge battery.
On power up, CN3382 enters charging state, 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 BAT pin voltage reaches 8.4V(Typ.) for the first time, CN3382 enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until BAT voltage reaches 8.4V for the second time. In termination mode, the N-channel MOSFET is turned off. When BAT voltage falls below recharge threshold, the CN3382 enters charge mode again. CN3382’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, CN3382 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, chip over temperature protection, current sense resistor short-circuit protection and status indication, etc.
CN3382 is available in 8-pin SOP package.
l 2-cell Li+ Battery Charging Management
l Power Bank, POS, Electric Fan
l Audio System
l Standalone Charger
l Input Voltage Range：2.75V to 6.5V
l Operating Current：280uA@VIN=5V
l Can be Powered by Solar-panel
l Inductor Current Detection
l Switching Frequency up to 1MHz
l Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance
l Short-circuit Protection for Current Sense Resistor
l Automatic Recharge
l Output Power up to 35W
l Protection for Low Battery Voltage and Short Battery
l Automatic Adaptability to Input Supply with Limited Driving Capability
l Chip Enable Input
l Chip Over Temperature Protection
l Battery Overvoltage Protection
l Status Indication
l Operating Temperature ：－40℃ to 85℃
l Available in SOP8 Package
l Lead-free, rohs-Compliant and Halogen Free