SP4427DS/01

SP4427 Electroluminescent Lamp Driver

© Copyright 1997 Sipex Corporation

1

s DC to AC Inverter for EL Backlit

Display Panels

s Low Voltage, Single Battery Operation

(vbat > 1.1 Vdc)

s Dual Oscillator Operation for

Application Flexibility

s Low Current Standby Mode

APPLICATIONS

s Pagers s PDA's s Backlit

LCD Displays

SP4427

Electroluminescent Lamp Driver

Dual Oscillators with High Drive Capability

DESCRIPTION…

The SP4427 is a high voltage output DC-AC converter that can operate from a single 1.5 Vdc

battery supply. The SP4427 is capable of supplying up to 250 Vpp signals, making it ideal for

driving electroluminescent lamps. The device features 100nA (typ) standby current, for use

in low power portable products. One external inductor is required to generate the high voltage

charge, and two external capacitors are used to select the oscillator and lamp frequencies.

The SP4427 is offered in both an 8 pin narrow SOIC or micro SOIC package. For delivery

in die form, please consult the factory.

6

VDD

HON

H

Bridge

COIL

EL1

EL2

7

1

8

VSS

2

4

5

3

Cosc

Losc

8 Bit Counter

EN

Coil OSC

Lamp OSC

Block Diagram