 English |
|
|
|
|
|
|
|
| SP4438 Datasheet, PDF (1/19 Pages) Sipex Corporation – Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications | |||
| |||
|
®
SP4438
Ultra-Quiet Electroluminescent Lamp Driver
For Cellular Phone Applications
s Patent Pending Output Waveshaping
s Waveshaped Output Optimized For Low
Acoustic Noise And Maximum Efficiency
s Reduced Supply Current And Standby
Current
s Up to15cd/m2 For Cell Phone Sized EL
Lamps (2 to 3 sq. in.)
s Waveshaped Output And Low Frequency
Operation Minimize Stress On EL Lamp To
Extend Its Lifetime
s Uses 820µH, Sub-2mm Coils
s Gradual Rising And Falling Edges Minimizes
EMI
s +2.7V To +3.3V Battery Operation
s Space-Saving 8-pin MSOP package
APPLICATIONS
s Cellular Radios
s Wireless Communication Products
DESCRIPTION
The SP4438 device is a low noise, high voltage output DC-AC inverter designed to drive
electroluminescent lamps to backlight liquid crystal display and keypads used in cellular
phones, cordless phones, 2-way radios, and other wireless communication products. The
output waveform of the SP4438 device is ideal for cell phone applications requiring low
acoustic noise performance. One external resistor is used to set the internal oscillator
frequency and one inductor is required to generate the high voltage AC output to drive an EL
lamp up to 3 square inches in size. The SP4438 operates from a +3.0V battery source and
has a low power standby mode that draws less than 1µA, making it ideal for low-power cellular
applications. All input pins are ESD protected with internal diodes to VDD and VSS. The SP4438
is offered in a space-saving 8-pin MSOP package.
VBATT
VDD 1
ELEN 2
ROSC 3
VSS 4
Rev.11/13/00
SP4438
8 EL1
7 EL2
6 CINT
5 COIL
C1
0.1µF
ELEN
ROSC
714kâ¦
C2
1nF
2
VDD
1
ROSC
3
SP4438
5 COIL
6
CINT
4
87
VSS
EL1
EL2
L1
820µH/14â¦
D1
1N4148
CINT
47nF
EL Lamp
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
1
© Copyright 2000 Sipex Corporation
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese