Product Introduction

Product parameters

Funtion:5A, Lead-Acid Battery Charger IC

Opration Mode:Switch

Battery:6V/12V lead-acid battery

Vout Range:0V-25V

Vin Range:7.5V-30V

Max Charge Current:5A

Operating Current:1.7mA

Solar Panel charge:No

Chip Temperature Regulation:No


Switching Frequency:300kHz

Chip Enable:No

On-chip Power MOSFET:No

General Descriptions:

The CN3717 is a PWM switch-mode battery charger controller for lead-acid battery in a small package using few external components.

The CN3717 is specially designed for charging lead-acid battery with trickle charge, constant current charge, over-charge and float charge mode. In over-charge and float charge mode, the regulation voltage is set by the external resistor divider. The constant charging current is programmable with a single sense resistor.

Deeply discharged batteries are automatically trickle charged at 19% of the programmed constant charging current until the cell voltage exceeds 75.6% of the regulation voltage in over-charge mode. The over-charge is terminated once the charging current drops to a level set by an on-chip resistor and an external resistor, then CN3717 will enter into float charge mode. A new charge cycle automatically restarts if the battery voltage falls below 82.2% of the over-charge voltage in float-charge mode. CN3717 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.

CN3717 is available in a space-saving 16-pin TSSOP package.


l  Lead-Acid Battery Charger

l  UPS

l  Portable Industrial and
Medical Equipment

l  Standalone Battery Chargers


l  Wide Input Voltage: 7.5V to 28V

l  Complete Charger Controller for Lead-Acid Battery

l  Charge Current Up to 5A

l  High PWM Switching Frequency: 300KHz

l  Over-Charge Voltage Set By the External Resistor Divider

l  Charging Current is programmed
 with a sense resistor

l  Automatic Conditioning of Deeply Discharged Batteries

l  Over-charge Termination Current can be set by an external resistor

l  Battery Temperature Monitoring

l  Automatic Recharge

l  Charger Status Indication

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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