4

Date: 05/25/04

SPX2930 150mA Low Dropout Voltage Regulator

© Copyright 2002 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

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

FROMPC BOARD

10

1

0.1

0

30

60

90

120

150

FREQUENCY (Hz)

0.01

5.0V

I

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

= 500Ω

APPLICATION INFORMATION

The SPX2930 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

only bench testing is the only means to deter-

mine the proper capacitor type and value. The

high quality 100

µF aluminum electrolytic cov-

ers all general application circuits, this stability

can be obtained with a tantalum electrolytic

value of 47

µF.

Another critical point of electrolytic character-

istics is its performance over temperature. The

SPX2930 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

TYPICAL PERFORMANCE CHARACTERISTICS