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SPX2931U-3.0 Datasheet(PDF) 4 Page - Sipex Corporation |
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SPX2931U-3.0 Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 7 page 4 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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