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廬

SP4428

Electroluminescent Lamp Driver

High Drive Capability for Low Voltage Applications

s

Low Power +1.1V to +1.7V Single

Cell Operation

s

Low-Cost EL Driver Ideal for Backlighting

s

DC-to-AC Inverter Generates High

Voltage AC to Drive EL Lamps

s

Externally Adjustable Oscillator

s

Low Current Standby Mode

APPLICATIONS

s

Pagers

s

Watches

s

Backlit LCD Displays

DESCRIPTION

The

SP4428

is a high voltage output DC-AC converter that can operate from a single 1.5 VDC

power supply. The

SP4428

is capable of supplying 200 V

PP

(typical), making it ideal for driving

electroluminescent lamps. The device features 1碌A(chǔ) (typical) standby current, for use in low

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

charge, and one external capacitor is used to produce a clock signal that generates the coil

and lamp frequencies. The

SP4428

is ideal for PDAs, pagers, and other low power portable

applications using LCDs in dim or low light environments. The

SP4428

is offered in an 8-pin

narrow SOIC. For delivery in die form, please consult the factory.

C

OSC

V

SS

COIL

D1

1

2

3

4

SP4428

8

7

6

5

HON

V

DD

EL1

EL2

Block Diagram

SP4428DS/16

SP4428 Electroluminescent Lamp Driver

漏 Copyright 2000 Sipex Corporation

1

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