DESCRIPTION
The SP4501 provides designers with both an electroluminescent lamp driver for backlighting and a piezotransducer driver to generate audio alert tones. The integration of an EL lamp driver and a piezotransducer driver in a single cost-effective IC reduces system cost, board space requirements and component count. The SP4501 is ideal for portable applications such as pagers, electronic games, PDAs, medical equipment, and designs with liquid crystal displays, keypads, and backlit readouts. The SP4501 will operate from a +2.2V to +6.0V source.

■ Integrated EL Plus Piezo Driver For Portable Electronic Devices
■ Reduces System Cost, Size & Component Count
■ +2.2V to +6.0V Battery Operation
■ A Single External Coil Drives Both the EL Lamp and Piezotransducer Circuitry
■ Piezotransducer Can Be Driven By an External Clock or Internal Clock
■ A Single Resistor Controls the Internal Oscillator
■ DC-to-AC Inverter Produces Up To 200V P-P to Drive EL Lamps
■ DC-to-AC Inverter Produces Waveform to Drive Piezotransducer
■ Low Current Standby Mode Draws Less than 1µA

APPLICATIONS
■ PDAs
■ Pagers
■ GPS
■ Hand Held Medical Devices