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SPX1129U-L-5-0 Datasheet(PDF) 3 Page - Sipex Corporation |
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SPX1129U-L-5-0 Datasheet(HTML) 3 Page - Sipex Corporation |
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3 / 8 page  3 Mar3-07 SPX29 400 mA Low Dropout Linear Regulator © 2007 Sipex Corporation External Capacitors The stability of the SPX1129 requires a 2.2µF or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic works fine here. For operations of below -25°C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30°C. The ESR of about 5 or less and resonant frequency above 500kHz are the most important parameters in the value of the capaci- tor. The capacitor value can be increased with- out limit. The SPX1129, unlike other low dropout regula- tors will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applica- tions like CMOS RAM keep-alive. If there is more than 10 inches of wire between the input and the AC filter capacitor, or if a battery is used as the input, then a 0.1µF tanta- lum or aluminum electrolytic capacitor should be placed from the input to the ground. Reducing Output Noise It may be an advantage to reduce the AC noise present at the output. One way is to reduce the regulator bandwidth by increasing the size of the output capacitor. Increasing the capacitor from 1µF to 220µF decreases the noise from 430µV to 160µV rms for a 100kHz bandwidth at 5V output. APPLICATION INFORMATION |
Similar Part No. - SPX1129U-L-5-0 |
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Similar Description - SPX1129U-L-5-0 |
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