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DESCRIPTION

The SP4490 electroluminescent lamp driver provides designers of cell phones PDAs and other handheld, portable electronic devices with an integrated solution for driving two EL lamps independently. The SP4490 reduces system cost, component count and board space requirements over a discrete 2-EL driver approach. The EL lamps operate in opposite phase so the SP4490 can be easily implemented in applications driving multi-color or multi-segment EL lamps. The SP4490 operates from a +2.2V to +6.0V battery source. The device features a low power standby mode which draws less than 1μA. The frequency of the internal oscillator is set using a single external resistor.

■ Single IC Drives 2 EL Lamps Independently For Backlighting:

? Cell Phone Keypad & LCD

? Multi-Color EL Lamps

? Multi-Segment EL Lamps

■ Control Over Lamp-A & Lamp-B For Independent Operation

■ +2.2V to +6.0V Battery Operation

■ Single Coil Used To Generate High Voltage AC Outputs

■ Low Power Standby Mode Draws 100nA Typical Current

■ A Single Resistor Controls the Internal Oscillator

■ DC-AC Inverter Produces Up To 220VPP

■ Space-Saving 10μSOIC Package

APPLICATIONS

■ Cellular Phones

■ PDAs

■ Handheld GPS Units

■ Security Systems

■ POS Terminals