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:≥4.5V

Operating Current:380uA@VIN=5V

Solar Panel charge:No

Chip Temperature Regulation:Yes


Chip Enable:No

On-chip Power MOSFET:No

General Descriptions:

CN3322 is a PFM mode step-up 2-cell Li-ion battery charging controller IC with minimum operating voltage down to 4.5V. CN3322 adopts trickle, constant current (CC) and quasi-constant voltage(Quasi-CVTM) mode to charge battery.

On power up, CN3322 enters charging mode, the external N-channel MOSFET is turned on first, inductor current rises. When inductor current reaches upper limit, the N-channel MOSFET is turned off, 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, and so forth. When BAT pin voltage reaches 8.4V(Typ.) for the first time, CN3322 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. If BAT pin voltage falls below recharge threshold, CN3322 enters charge mode again. CN3322’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

The other features include self-adaptive function to input supply, JEITA-compliant battery temperature monitoring, chip over temperature protection and status indication, etc.

CN3322 is available in thermally-enhanced 8-pin SOP package.


l  Standalone 2-cell Battery Charger

l  Electrical Appliance

l  Audio Systems

l  POS, etc.


l  Minimum Operating Voltage: 4.5V

l  Fixed Charge Termination Voltage: 8.4V

l  Self-adaptive to Input Supply

l  Operating Current: 380uA@VIN=5V

l  Inductor Current Sensing

l  Switching Frequency: up to 1MHz

l  Quasi-CV Mode to Compensate for Voltage Loss on Parasitic Resistance

l  Trickle, Constant Current and Quasi-CV Charge Mode

l  Automatic Recharge

l  JEITA-Compliant Battery Temperature Monitoring

l  Battery Over-voltage Protection

l  Over Junction-temperature Protection

l  2 Open-drain Indication Outputs

l  Operating Temperature Range:40℃ to 85℃

l  Available in eSOP8 Package

l  Lead-free, rohs-Compliant and Halogen Free


Tools and Documents




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