Product Introduction

Product parameters

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Funtion:JEITA-Compliant 1-Cell LiFePO4 Battery Charger IC for Solar-Powered Systems


Opration Mode:Linear

Battery:single cell LiFePO4 battery

Battery No.:1

Vout Range:0V-3.63V

Vin Range:4V - 6V

Max Charge Current:950mA

Operating Current:500uA

Solar Panel charge:Yes

Chip Temperature Regulation:Yes


Chip Enable:No

On-chip Power MOSFET:Yes

General Description:

The CN3157 is a complete constant-current /constant voltage linear charger for single cell LiFePO4 battery. 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 CN3157 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 3.63V with 1% accuracy, it can also be adjusted upwards with an external resistor. The charge current can be set externally with a single resistor. When the input supply is removed, the CN3157 automatically enters 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/termination indicator.

The CN3157 is available in thermally-enhanced 8-pin SOP package (eSOP8).


l  Emergency Lighting

l  Beauty and Grooming

l  Fleet Management, Asset Tracking

l  Solar Powered System

l  Portable Devices



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

l  Suitable for Solar-Powered System

l  No external Blocking Diode or Current Sense Resistors Required

l  Preset 3.63V regulation voltage with 1% accuracy, upwards adjustable with a resistor

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  Continuous Charge Current Up to 950mA

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  C/10 Charge Termination

l  Automatic Recharge

l  JEITA-Compliant Battery Temperature Monitoring

l  Available in eSOP8 Package

l  Pb-free, rohs-Compliant and Halogen Free

Tools and Documents




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