®
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
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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 1µA (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
© Copyright 2000 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
