Product Introduction

Product parameters

Funtion:5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function

Opration Mode:Switch

Battery:1 or multi-cell lithium ion batteries or LiFePO4 batteries

Vout Range:0V-25V

Vin Range:7.5V-28V

Max Charge Current:5A

Operating Current:1.55mA

Solar Panel charge:Yes

Chip Temperature Regulation:No


Switching Frequency:300kHz

Chip Enable:No

On-chip Power MOSFET:No

General Descriptions:

The CN3722(Note 1) is a PWM switch-mode battery charger controller that can be powered by photovoltaic cell with maximum power point tracking function. The CN3722 is specially designed for charging 1 or multi-cell lithium ion batteries or LiFePO4 batteries with constant current and constant voltage mode. In constant voltage mode, the regulation voltage is set by the external resistor divider. The constant charging current is programmable with a single current sense resistor.

Deeply discharged batteries are automatically trickle charged at 15% of the programmed constant charging current until the cell voltage exceeds 66.7% of the regulation voltage. In constant voltage mode, the charging current decreases gradually, the charge cycle will be terminated when the charging current drops to 9.5% of the full-scale current, and a new charge cycle automatically restarts if the battery voltage falls below 95.8% of the regulation voltage in constant voltage mode.

CN3722 will automatically enter sleep mode when input voltage is lower than battery voltage. Other features include undervoltage lockout, battery temperature monitoring and status indication, etc.

CN3722 is available in a space-saving 16-pin TSSOP package.


l  The Charger Powered by Photovotaic cell

l  Electric Tools

l  Battery-Backup Systems

l  Standalone Battery Chargers

Note 1: Patent Pending


l  Photovoltaic Cell Maximum Power Point Tracking

l  Wide Input Voltage: 7.5V to 28V

l  Complete Charger Controller for 1 or multi-cell Lithium-ion Battery or LiFePO4 Battery

l  Charge Current Up to 5A

l  High PWM Switching Frequency: 300KHz

l  Constant Charging Voltage Set By the External Resistor Divider

l  Charging Current is programmed
 with a sense resistor

l  Automatic Conditioning of Deeply Discharged Batteries

l  Battery Temperature Monitoring

l  2 Status Indications

l  Soft Start

l  Battery Overvoltage Protection

l  Operating Ambient Temperature
40 to 85

l  Available in 16 Pin TSSOP Package

l  Pb-free , RoHS Compliant,
and Halogen Free

Tools and Documents




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