Overview: CN3717 is a PWM buck mode lead-acid battery charge management integrated circuit that automatically manages the charging of lead-acid batteries independently. It features a small package size, few external components, and ease of use. CN3717 has trickle, constant current, overcharge, and float charge modes, making it ideal for lead-acid battery charging. In overcharge and float charge modes, the charging voltage is set by an external resistor divider network; in constant current charging mode, the charging current is set by an external resistor. At the beginning of charging, if the battery voltage is below 75.6% of the set overcharge voltage, CN3717 performs trickle charging with 19% of the set constant current charging current. In the overcharge stage, the charging current gradually decreases, and when the charging current decreases to the value set by the external resistor, CN3717 enters the float charge state. In the float charge state, if the battery voltage drops to 82.2% of the set overcharge voltage, a new charging cycle automatically begins. When the input power is cut off or the input voltage is lower than the battery voltage, CN3717 automatically enters a low-power sleep mode. Other functions include input undervoltage latch, battery temperature monitoring, battery overvoltage protection, and charging status indication. CN3717 is packaged in a 16-pin TSSOP package.

Product Parameters

Main Functions: 5A Lead-Acid Battery Charging Management Integrated Circuit

Operating Mode: Switching

Battery Type: Lead-acid battery

Number of Batteries: 6V, 12V Lead-acid batteries

Output Voltage Range: 0V-25V

Input Voltage Range: 6.6V-30V

Maximum Charging Current: 5A

Operating Current: 1.7mA

Solar Power Supply: No

Thermal Modulation: No

Packaging Type: TSSOP16

Switching Frequency: 300kHz

Built-in Power Tube: No

Applications ：

l Lead-acid battery charging

l Uninterruptible power supply

l Backup battery applications

l Portable industrial and medical instruments

l Independent battery chargers

Features ：

l Wide input voltage range: 7.5V to 28V

l Complete charging management for lead-acid batteries

l Overcharge and float charge voltage set by external resistor divider network

l Charging current up to 5A

l PWM switching frequency: 300KHz

l Constant current charging current set by external resistor

l Trickle charging for deeply discharged batteries

l Overcharge point end current set by external resistor

l Battery temperature monitoring function

l Automatic recharging function

l Dual status indication

l Soft start function

l Battery terminal overvoltage protection

l Operating temperature range: -40°C to +85°C

l Using 16-pin TSSOP package

l Product is lead-free and halogen-free, meeting RoHS