CN3768-Lead-acid battery charging management integrated circuit

CN3768 is a PWM step-down mode 12V lead-acid battery charging management integrated circuit that independently and automatically manages lead-acid battery charging. It has the advantages of small package size, few peripheral components and simple use. CN3768 has trickle current, constant current, overcharge and float charge modes, which is very suitable 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 lower than 75% of the set overcharge voltage, CN3768 uses 17.5% of the set constant current charging current to trickle charge the battery. During the overcharge stage, the charging current gradually decreases. 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 will automatically start. When the input power fails or the input voltage is lower than the battery voltage, CN3768 automatically enters a low-power sleep mode. Other functions include input low voltage latch, battery terminal overvoltage protection and charging status indication. CN3768 is available in 8-pin SOP package.