SP4438 Datasheet, PDF (2/19 Pages) Sipex Corporation – Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications

ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
Supply Voltage (V_DD to V_SS)........................-0.3V, +5V
Operating Temperature.......................-40˚C to +85˚C
Storage Temperature........................-65˚C to +150˚C
Power Dissipation Per Package
8-pin MSOP
(derate 4.85mW/^OC above +70^OC).........................400mW
SPECIFICATIONS
V
DD
=
+2.7V
to
+3.3V,
L
COIL
=
820µH/14Ω,
R
OSC
=
714kΩ,
EL
Lamp
Load
=
(8nF
+
2.5kΩ)/1MΩ,
and
T
AMB
=
-40^OC
to
+85^OC.
T = 25OC for typical
AMB
values unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX. UNITS
CONDITIONS
INPUT CHARACTERISTICS
Supply Voltage, V_DD
Supply Current, I_COIL+I_DD
Coil Voltage, V_COIL
ELEN Input Voltage, V_ELEN
LOW: EL _OFF
HIGH: EL _on
ELEN Input Impedance
2.7
3.0
3.3
V
30
mA V_DD = +3.0V
V_DD
9
V
-0.25
0
0.25V
V
V_DD-0.25
V_DD
V_DD+0.25
1
3
MΩ
Shutdown Current, I_SD=I_COIL+I_DD
INDUCTOR DRIVE
1
µA
V_ELEN = LOW,V_DD = +3.0V
Coil Frequency, f_COIL
Coil Duty Cycle
26
23
32
43
45
kHz
R_OSC = 714kΩ,T_AMB = +25^OC
T_AMB = -40^OC to +85^OC,V_DD = +3.0V
90
%
Peak Coil Current, I_PK-COIL
EL LAMP OUTPUT
100
mA
EL Lamp Frequency, f_LAMP
190
250
175
336
348
Hz
T_AMB = +25^OC,V_DD = +3.0V,with load
T_AMB = -40^OC to +85^OC
Peak to Peak Output Voltage, V
130
145
P-P
120
140
V_P-P
T = +25^OC,V = +3.0V,with load
AMB
DD
T_AMB = -40^OC to +85^OC
Audible Noise
26
dB_SPL T_AMB = +25^OC,V_DD = +3.0V, NOTE 1
Rise Time
.55
0.8
1.0
ms
T_AMB = +25^OC,V_DD = +3.0V,with load,
measured from 10% to 90%
NOTE 1: Audible Noise is measured inside an acoustic sound chamber. The Sound Level Meter is a B&K
Mediator 2238, A-weighted with Condenser Mic type 4188 positioned 1/4 inch above the lamp in an 8 cubic inch
volume. See Figure 5 on page 6.
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
2