Phoenix, Arizona -- June 22, 1999 -- A new Electroluminescent Lamp (EL) Driver integrated circuit, introduced by Motorola Semiconductor Components Group today, will significantly lengthen battery life when powering the LCD display in low power portable products. The chip offers substantially lower standby current drain than previously available devices.
The new electroluminescent lamp driver IC, type MC33441, is designed to consume approximately 50% less standby power than similar products on the market. Owners of portable products will benefit from the sophisticated design which achieves the industry's lowest quiescent current consumption rate of only 10nA, ideal to significantly extend the life of the battery.
The MC33441 is a DC-AC inverter IC used to drive the EL lamp which illuminates the LCD display in portable products such as pagers, cellular phones, calculators, databanks, portable CDs and portable minidisks. The device boosts the low DC input voltage to 140V p-p, the typical AC output voltage for driving EL lamps. It is also equipped with a power saving feature - an external Enable pin to switch the lamp ON and OFF.
The operating input voltage for the EL Driver IC ranges from 1.8V to 3.5V DC. Internally, the device consists of an oscillator, a frequency divider, a coil driving circuit and a switched H-bridge network. There is a built in coil drive current limit is 70mA that protects the coil from saturation. The H-bridge configuration increases the EL lamp life by maintaining a low bias drive of 2V. There is also the added benefit of cost and space savings on the printed circuit board because the MC33441 requires fewer passive external components - one inductor and one resistor - to generate the desirable AC output voltage and fine tune the oscillator.
The MC33441 EL Driver IC is offered in a TSSOP- 8 surface mount package. Samples and production units are currently available with pricing suggested at $0.44 for 1K quantities.
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