®
SP4403
Low Voltage Electroluminescent Lamp Driver
s
+2.2V to +4.5V Battery Operation
s
DC-to-AC Converter Produces Up To
220V
PP
for EL Display Panels
s
Single Resistor Controlled Internal Oscillator
s
Low Current Standby Mode
s
Features
• High Efficiency Super Driver Architecture
• Uses Small 470µH Coil
APPLICATIONS
s
Pagers
s
Cellular Phones
s
PDAs
DESCRIPTION
The
SP4403
is a high voltage output DC-AC inverter specifically designed to drive
electroluminescent lamps to backlight liquid crystal displays, keypads, and backlit readouts
used in battery operated portable equipment. The
SP4403
will operate from a +2.2V to +4.5V
battery source. The device features a low power shutdown mode which draws less than
100nA (typical), ideal for low power portable products. One external inductor is required to
generate the high voltage AC output. One external resistor is used to select the internal
oscillator frequency. The
SP4403
is ideal for portable applications such as cellular phones,
PDAs, and other portable applications using LCDs in dim or low light environments. The
SP4403
is offered in 8 pin
µSOIC
packages.
V
BATT
ELEN 1
V
SS
2
COIL 3
EL1 4
SP4403
8 R
OSC
7 C
INT
6
5
V
DD
EL2
C1
0.1µF
ELEN
1
L1
470µH
SP4403
V
DD
R
OSC
450kΩ
6
3
COIL
D1
1N4148
*
R
OSC
8
7
C
INT
C2
10nF
2
V
SS
4
EL1
5
EL2
C
INT
1800pF
*
EL Lamp
*
optional device
SP4403DS/05
SP4403 Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
