Product Introduction

Product parameters

Funtion:400mA Single-Cell Lithium Battery Charger IC

Opration Mode:Linear

Battery:single cell Li-ion and Li Polymer battery

Battery No.:1

Vout Range:0V-4.2V

Vin Range:4.5V - 6V

Max Charge Current:400mA

Operating Current:390uA

Solar Panel charge:Yes

Chip Temperature Regulation:Yes


Chip Enable:No

On-chip Power MOSFET:Yes

General Description:

The CN3140 is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer batteries. The device contains an on-chip power MOSFET and eliminates the need for the external sense resistor and blocking diode. An on-chip adaptive cell can adjust charging current automatically based on the output capability of input power supply, so CN3140 is ideally suited for solar powered system. Thermal feedback regulates the charge current to limit the die temperature at about 132℃ during high power operation or high ambient temperature. The regulation voltage is internally fixed at 4.2V with 1% accuracy. The charge current can be set externally with a single resistor, the minimum charge current can be set down to 3mA, which makes CN3140 very suitable for charging ultra-small capacity battery. When the input supply is removed, the CN3140 automatically enters a low power sleep mode, dropping the battery drain current to less than 3uA.

Other features include undervoltage lockout, automatic recharge, JEITA-compliant battery temperature monitoring, over charge current protection and charging indicator.

The CN3140 is available in 2mm*2mm 6-pin DFN package.



l  Medical Electronics

l  Wearable Equipment

l  Beauty and Grooming

l  Fleet Management, Asset Tracking


l  Input Supply Voltage Range: 4.5V to 6V

l  Automatic charge current adjustment based on the output capability of input power supply

l  Suitable for Solar-Powered System

l  Regulation voltage: 4.2V±1%

l  Continuous Charge Current Up to 400mA

l  Minimum Constant Charge Current down to 3mA

l  Over Charge Current Protection in case Short Circuit at ISET Pin

l  Precharge Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage of Charge

l  Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating

l  Automatic Low-Power Sleep Mode When Input Supply Voltage is Removed

l  Status Indication for LEDs or uP Interface

l  Automatic Charge Termination and Recharge

l  JEITA-Compliant Battery Temperature Monitoring

l  Available in 2mm*2mm DFN-6 Package

l  Pb-free, rohs-Compliant and Halogen Free


Tools and Documents




Code Click Replace