Product parameters

Funtion：PFM Step-up 2-cell Lithium Battery Charger IC

Opration Mode：Switch

Battery：Lithium-ion

Battery No.：2

Vout Range：0V-8.4V

Vin Range：2.75V - 6.5V

Operating Current：280uA@VIN=5V

Solar Panel charge：Yes

Chip Temperature Regulation：No

Package：SOP8

Chip Enable：Yes

On-chip Power MOSFET：No

General Description：

CN3302 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. CN3302 adopts constant current and quasi-constant voltage(Quasi-CV^TM) mode to charge battery.

On power up, CN3302 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, CN3302 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 CN3302 enters charge mode again. CN3302’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, CN3302 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, chip over temperature protection and status indication, etc.

CN3302 is available in 8-pin SOP package.

Applications:

l  2-cell Li+ Battery Charging Management

l  Power Bank, POS, Electric Fan

l  Audio System

l  Standalone Charger

Features：

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  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