Product Introduction

Product parameters

Funtion:PFM Switch-mode Step-up Battery Charger IC

Opration Mode:Switch

Battery:Lithium-ion,LiFEPO4 and Lead-Acid Battery

Vout Range:Adjust

Vin Range:4.5V to 32V

Operating Current:380uA@VIN=12V

Solar Panel charge:Yes

Chip Temperature Regulation:No


Max Output Power:40W

Chip Enable:No

On-chip Power MOSFET:No

General Descriptions:

CN3301 is a PFM mode step-up battery charging controller IC with operating voltage range between 4.5V to 32V. CN3301 adopts trickle, constant current(CC) and quasi-constant voltage(Quasi-CVTM) mode to charge battery, very suitable for Lithium, LiFePO4 and Lead-acid battery charging with fewer external components.

On power up, CN3301 enters charging mode, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper limit, 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 limit, the N-channel MOSFET is turned on again, and so forth. When FB pin voltage reaches 1.205V(Typ.) for the first time, CN3301 enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until FB voltage reaches 1.205V for the second time. In termination mode, the N-channel MOSFET is turned off. If FB voltage falls below recharge threshold, CN3301 enters charge mode again. CN3301’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

The other features include solar panel’s maximum power point tracking, JEITA-compliant battery temperature monitoring, chip over temperature protection and status indication, etc.

CN3301 is available in 10-pin SSOP package.


l  Standalone Multi-cell Battery Charger

l  Charging Management for Lithium, LiFePO4, Lead-acid Batteries

l  Electrical Appliance

l  Audio Systems

l  E-bike, etc.


l  Input Voltage Range: 4.5V to 32V

l  Maximum Power Point Tracking for Solar Panel

l  Operating Current: 380uA@VIN=12V

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 SSOP10 Package

l  Lead-free, rohs-Compliant and Halogen Free

Tools and Documents




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