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SP4438UEB Datasheet

  • SP4438UEB

  • Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phon...

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  • SIPEX

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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/m
2
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 820碌H, 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 1碌A, making it ideal for low-power cellular
applications. All input pins are ESD protected with internal diodes to V
DD
and V
SS
. The SP4438
is offered in a space-saving 8-pin MSOP package.
V
BATT
V
DD
1
ELEN 2
R
OSC
3
V
SS
4
SP4438
8
EL1
ELEN
2
L1
820碌H/14鈩?/div>
7 EL2
6
5
C
INT
COIL
C1
0.1碌F
C2
1nF
V
DD
R
OSC
714k鈩?/div>
1
R
OSC
3
4
SP4438
5
6
COIL
D1
1N4148
C
INT
8
V
SS
EL1
7
EL2
C
INT
47nF
EL Lamp
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
漏 Copyright 2000 Sipex Corporation
1

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