SPX2391AS datasheet(4/7 Pages) SIPEX

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Date: 05/25/04

SPX2931 100mA Low Dropout Voltage Regulator

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

°F.

Another critical point of electrolytic character-

istics is its performance over temperature. The

SPX2931 is designed to operate starting at -

°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

70 80

AMBIENT TEMPERATURE (ºC)

50 60

0.4

0.8

1.2

1.6

2.0

1.0

40 50 60

AMBIENT TEMPERATURE (ºC)

0.9

0.8

0.7

0.6

0.5

0.4

0.1

0.3

0.2

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

-2

300

500

= 100µF

= 500 Ω

0.1

120

150

FREQUENCY (Hz)

0.01

LM2931-

5.0

O = 10mA

TYPICAL PERFORMANCE CHARACTERISTICS

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