MAX4990E

19-0886; Rev 0; 8/07 www.DataSheet4U.com High-Voltage, ±15kV ESD-Protected Electroluminescent Lamp Driver General Description The MAX4990E high-voltage DC-AC converter is ideal for driving electroluminescent (EL) lamps. The MAX4990E features a wide +2.4V to +5.5V input range that allows the device to accept a wide variety of voltage sources such as single-cell lithium-ion (Li+) batteries and higher voltage battery chargers. The lamp outputs of the device generate up to 250V peak-topeak output voltage for maximum lamp brightness. The MAX4990E utilizes an inductor-based boost converter to generate the high voltage necessary to drive an EL lamp. The boost-converter switching frequency is set with the combination of an external capacitor connected from SW to GND and an external resistor connected from SLEW to GND. The MAX4990E uses a high-voltage full-bridge output stage to convert the high voltage generated by the boost converter to an AC waveform suitable for driving the EL panel. The EL output switching frequency is set with the combination of an external capacitor connected from EL to GND and an external resistor connected from SLEW to GND. The MAX4990E uses a proprietary acoustic noisereduction circuit that controls the slew rate of the AC voltage, reducing audible noise from the EL panel. The slew rate is set with an external resistor connected from SLEW to GND. The MAX4990E features an EL lamp dimming control (DIM) that allows the user to set the EL output voltage with a...