Chip Features Specifically designed for lead-acid battery charging control, integrating constant voltage, constant current, and float charging three-stage control modules. Integrated with a precise three-way voltage reference source, specifically for the constant voltage, constant current, and float charging module reference source. Integrated with a dual LED charging indicator conversion circuit and driver circuit. Optional float charging point conversion current, also providing customized float charging conversion current. Few external components. Easy to compensate. Low static operating current: 1.6mA

Chip Description

EG4318/EG4319/EG4320 is a lead-acid battery charge management chip specifically designed for AC/DC power supplies. It features automatic conversion among constant voltage, constant current, and float charge three-stage states. Additionally, it integrates a dual-LED charging indicator conversion circuit and drive circuit internally, significantly simplifying the number of external components, greatly improving system stability, and reducing production costs.

EG4318/EG4319 integrates a 2.5V reference voltage source, a 250mV reference voltage source, and a 50mV reference voltage source internally. EG4320 integrates a 2.5V reference voltage source, a 140mV reference voltage source, and a 20mV reference voltage source internally. EG4318/EG4319/EG4320 integrates two operational amplifiers, one current comparator, a float charge control circuit, an LED control drive circuit, and more. The 2.5V reference voltage source combined with one internal operational amplifier forms a precise voltage control circuit. Users can adjust the output voltage required for the constant voltage stage of the lead-acid battery by setting the values of the two external voltage sampling resistors and the resistance of pin 6 (Vf) of the chip. The 250mV reference voltage source combined with the other internal operational amplifier forms a precise current control circuit. Users can adjust the output current required for the constant current stage of the lead-acid battery by setting the value of the external current sampling resistor. The 50mV or 20mV reference voltage source combined with the internal current comparator forms a precise float charge voltage control circuit and a dual-LED control circuit. Users can adjust the output voltage required for the float charge stage of the lead-acid battery by setting the values of the two external voltage sampling resistors. Precise three-stage control of lead-acid battery charging can extend the lifespan of lead-acid batteries.