CN3704

CN3704 is a four-cell lithium battery charging management integrated circuit in PWM step-down mode, which independently and automatically manages four-cell lithium battery charging. It has the advantages of small package size, few peripheral components and simple use. CN3704 has constant current and constant voltage charging mode, which is very suitable for charging lithium batteries. In constant voltage charging mode, CN3704 modulates the battery voltage at 16.8V with an accuracy of ±1%; in constant current charging mode, the charging current is set by an external resistor. For deeply discharged lithium batteries, when the battery voltage is lower than 11.2V, the CN3704 trickles the battery with 15% of the set constant current charging current. In the constant voltage charging stage, the charging current gradually decreases, and when the charging current decreases to the value set by the external resistor, the charging ends. At the end of the charging state, if the battery voltage drops to 16V, a new charging cycle starts automatically. When the input power fails or the input voltage is lower than the battery voltage, the CN3704 automatically enters a low-power sleep mode. Other features include input low voltage latch, battery temperature monitoring, battery terminal overvoltage protection and charge status indication. CN3704 is packaged in 16-pin TSSOP.

application:

Laptop Battery Backup Application

Portable Industrial and Medical Instruments Power Tools

Standalone battery charger

Features:

Wide input voltage range: 7.5V to 28V

Complete charge management for four lithium batteries

Charging current up to 5A

PWM switching frequency: 300KHz

Constant voltage charging voltage accuracy: ±1%_constant current charging current is set by external resistor

Trickle charging of deeply discharged batteries

End-of-charge current can be set by external resistor

Battery temperature monitoring function

Auto recharge function

Charging status and charging end status indication

Soft start function

Battery terminal overvoltage protection

Working environment temperature: -40℃ to +85

Available in 16-pin TSSOP package

Products are lead-free, halogen-free, and RoHS compliant