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| SP4405 Datasheet, PDF (1/20 Pages) Sipex Corporation – Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage | |||
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SP4405
Low Voltage Electroluminescent Lamp Driver
with Regulated Output Voltage
s +2.2V to +4.5V Battery Operation
s DC-to-AC Converter Produces
160VPP typical for EL Display Panels
s Single Resistor Controlled Internal
Oscillator
s Low Current Standby Mode
s Internal Feedback Loop Maintains
a Constant Regulated EL Lamp
Voltage Output
APPLICATIONS
s Pagers
s Cellular Phones
s PDAs
DESCRIPTION
The SP4405 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 SP4405 will operate from a +2.2V to +4.5V
battery source. The device features an internal feedback loop that regulates the lamp voltage
output to 160VPP (typical) with varying supply voltages to maintain constant EL lamp brightness
over the life of the battery. The device also has a low power shutdown mode which draws less
than 50nA (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 set the internal
oscillator frequency. The SP4405 is ideal for portable applications such as pagers, cellular
phones, PDAs, and other portable applications using LCDs in dim or low light environments.
The SP4405 is offered in 8-pin SOIC and 8-pin µSOIC packages.
VBATTERY
ELEN 1
VSS 2
COIL 3
EL1 4
SP4405DS/18
SP4405
8 ROSC
7 CINT
6 VDD
5 EL2
ELEN
1
ROSC
450kâ¦
VDD 6
ROSC 8
SP4405
3
COIL
7
CINT
C1
C2
0.1µF
1nF
2
VSS
45
EL1
EL2
L1
470µH
*D1
1N4148
CINT
0.1µF
EL Lamp
*optional device
SP4405 Low Voltage Electroluminescent Lamp Driver
1
© Copyright 2000 Sipex Corporation
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