Converter Drives EL Lamps For Even Backlighting

Maxim Integrated Products has introduced an ESD-protected DC-to-AC converter for driving two electroluminescent (EL) lamps, suitable for MP3 players, personal digital assistants and smartphones. The Max14514, a +/-15kV converter for applications that require bright, efficient and even backlighting, utilises an inductor-based boost converter to generate a high 300Vp-p (maximum) voltage for maximum EL lamp brightness.

A high-voltage, full-bridge output converts this high voltage to the AC waveform required to drive an EL lamp. The Max14514 provides capacitor-adjustable switching frequencies, resistor-adjustable slew-rate control for audible-noise reduction and multiple options for controlling the output voltage. The device enables aesthetic effects by featuring dimming/enable controls for each output to slowly turn on/off each lamp; the output voltage slowly ramps when the output is enabled or disabled.

Featuring a wide +2.7V to +5.5V supply-voltage range, the Max14514 accepts a variety of voltage sources, such as lithium-ion (Li+) batteries and battery chargers. Fully specified over the -40C to +85C extended temperature range, the Max14514 is available in a 3 x 3mm, 14-pin TDFN package. Prices start at USD1.03 (GBP0.71) each in 1,000-unit quantities.

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