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PDF SP4438 Data sheet ( Hoja de datos )
| Número de pieza | SP4438 | |
| Descripción | Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP4438 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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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/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
714kΩ
C2
1nF
2
VDD
1
ROSC
3
SP4438
5 COIL
6 CINT
4 87
VSS EL1 EL2
L1
820µH/14Ω
D1
1N4148
CINT
47nF
EL Lamp
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
1
© Copyright 2000 Sipex Corporation
1 page  
VDD
1
ROSC
714kΩ
ROSC 3
SP4438
OSC
C1
0.1µF
C2
1nF
ELEN 2
Q
FF7
Q
BRIDGE
CONTROL
4
VSS
Figure 2: Internal Block Diagram of the SP4438
PMOS
VBATT
5 COIL
6 CINT
L1
820µH/14Ω
D1
1N4148
CINT
47nF
PMOS
DMOS
DMOS
87
EL1 EL2
EL Lamp
Figure 3: EL Differential Output Waveform of the EL1 and EL2 Outputs of the SP4438
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
5
© Copyright 2000 Sipex Corporation
5 Page 
Figure 7. Single Ended and Differential Output Waveforms for the SP4438
CH.1 and CH.2 are single ended waveform SP4438
CH.4 is differential SP4438 waveform.
Rev.11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
11
© Copyright 2000 Sipex Corporation
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SP4438.PDF ] | |
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