Overview: CN3768 is a PWM buck mode 12V lead-acid battery charging management integrated circuit. It independently and automatically manages the charging of lead-acid batteries, featuring a small package size, few external components, and ease of use. CN3768 has trickle, constant current, overcharge, and float charge modes, making it ideal for charging 12V lead-acid batteries. In overcharge and float charge modes, the typical charging voltages are 14.8V and 13.55V respectively; in constant current charging mode, the charging current is set by an external resistor. If the battery voltage is below 75% of the set overcharge voltage, CN3768 trickle charges the battery at 17.5% of the set constant current charging current. During the overcharge stage, the charging current gradually decreases, and when the charging current drops to 38% of the constant current charging current, CN3768 enters the float charge state. In the float charge state, if the battery voltage drops to 83.95% 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, CN3768 automatically enters a low-power sleep mode. Other functions include input undervoltage latch, battery overvoltage protection, and charging status indication. CN3768 uses an 8-pin SOP package.

Product Parameters

Main Functions: 4A, 12V Lead-Acid Battery Charging Management Integrated Circuit

Operating Mode: Switching

Battery Type: Lead-acid battery

Number of Batteries: 6 cells (12V)

Output Voltage Range: 0V-14.8V

Input Voltage Range: 6.6V-30V

Maximum Charging Current: 4A

Operating Current: 1mA

Solar Power Supply: No

Thermal Modulation: No

Packaging Type: SOP8

Switching Frequency: 315kHz

Built-in Power Tube: No

Applications ：

l Mobile speakers

l Lead-acid battery charging

l Uninterruptible power supply

l Backup battery applications

l Portable industrial and medical instruments

Features ：

l Wide input voltage range: 6.6V to 30V

l Complete charging management for 12V lead-acid batteries

l Overcharge and float charge voltages are 14.8V and 13.55V respectively

l Charging current up to 4A

l PWM switching frequency: 315KHz

l Constant current charging current is set by external resistor

l Trickle charging for deeply discharged batteries

l Automatic recharging function

l Charging status indication

l Soft start function

l Battery terminal overvoltage protection

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

l Uses 8-pin SOP package

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