11-14-00

SP4501 EL Plus Piezo Driver

© Copyright 2000 Sipex Corporation

1

s Integrated EL Plus Piezo Driver For

Portable Electronic Devices

s Reduces System Cost, Size & Compo-

nent 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

200V

s DC-to-AC Inverter Produces Waveform

to Drive Piezotransducer

s Low Current Standby Mode Draws Less

than 1

µA

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 1

µA (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 required to generate the high voltage AC used to drive the EL lamp

and the piezotransducer. All input pins are ESD protected with diodes to V

EL Plus Piezo Driver

ELEN

PZEN

PZCK

EL2

EL1

PZ2

1

2

3

4

11

12

13

14

PZCK

no connect

5

6

7

PZ1

COIL

8

9

10

CAP

SP4501

SP4501

APPLICATIONS

s PDA's

s Pagers

s GPS

s Hand Held Medical Devices

®