Product Introduction

Product parameters

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

Opration Mode:Switch


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


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-CVTM) 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.


l  2-cell Li+ Battery Charging Management

l  Power Bank, POS, Electric Fan

l  Audio System

l  Standalone Charger


l  Input Voltage Range2.75V to 6.5V

l  Operating Current280uA@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

Tools and Documents




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