SP4501

® SP4501 EL Plus Piezo Driver s Integrated EL Plus Piezo Driver For Portable Electronic Devices s Reduces System Cost, Size & Component Count s +2.2V to +6.0V Battery Operation s A Single External Coil Drives Both the EL Lamp and Piezotransducer Circuitry s Piezotransducer Can Be Driven By an External Clock or Internal Clock s A Single Resistor Controls the Internal Oscillator s DC-to-AC Inverter Produces Up To 200VP-P to Drive EL Lamps s DC-to-AC Inverter Produces Waveform to Drive Piezotransducer s Low Current Standby Mode Draws Less than 1µA APPLICATIONS s PDA's s Pagers s GPS s Hand Held Medical Devices 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. The device features a low power standby mode which draws less than 1µA (typical). The frequency of the internal oscillator is set with a single external resistor. The piezotranducer driver can be driven with the internally generated clock signal or an external clock signal provided by the designer. A single inductor is req...