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SPX2931U-3.0 Datasheet(PDF) 4 Page - Sipex Corporation

Part # SPX2931U-3.0
Description  100mA Low Dropout Voltage Regulator
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX2931U-3.0 Datasheet(HTML) 4 Page - Sipex Corporation

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Date: 05/25/04
SPX2931 100mA Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
Figure 7. Maximum Power Dissipation (SOT89)
Figure 8. Maximum Power Dissipation (TO-92)
Figure 9. Output Impedance
Figure 10. Operation During Load Dump
APPLICATION INFORMATION
The SPX2931 requires an output capacitor for
device stability. The value required varies greatly
depending upon the application circuit and other
factors. The high frequency characteristics of
electrolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes
bench testing is the only means to determine the
proper capacitor type and value. The high qual-
ity 100
°F aluminum electrolytic covers all gen-
eral application circuits, this stability can be
obtained with a tantalum electrolytic value of
47
°F.
Another critical point of electrolytic character-
istics is its performance over temperature. The
SPX2931 is designed to operate starting at -
40
°C which may not be true in the case of
electrolytic. Higher temperatures generally no
problem. The electrolytic. type in aluminum
will freeze around -30
°C. This could cause an
oscillation at output of regulator. At a lower
temperature requirement by many applications
the capacitor should maintain its performance.
So as a result, for an application which regulator
junction temperature does not exceed 25
°C, the
output capacitor can be reduced by the factor of
two over the value needed for the entire tem-
perature range.
0.0
010 20
40
70 80
AMBIENT TEMPERATURE (ºC)
30
50 60
90
0.4
0.8
1.2
1.6
2.0
1.0
0
20
40 50 60
AMBIENT TEMPERATURE (ºC)
0.9
0.8
0.7
0.6
0.5
0.4
0.1
0.3
0.2
0
10
30
70 80 90
0.125" LEAD LENGTH
FROM PC BOARD
0.4" LENGTH
FROM PC BOARD
OPERATION DURING LOAD DUMP
TIME (ms)
400
200
100
-100
30
10
0
6
4
-2
2
0
0
300
~
~
20
40
50
60
70
500
~
~
C
O
= 100µF
R
L
= 500 Ω
10
1
0.1
0
30
60
90
120
150
FREQUENCY (Hz)
0.01
LM2931-
5.0
I
O = 10mA
TYPICAL PERFORMANCE CHARACTERISTICS


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