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SPX1121M3-3-3 Datasheet(PDF) 6 Page - Sipex Corporation |
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SPX1121M3-3-3 Datasheet(HTML) 6 Page - Sipex Corporation |
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6 / 9 page  Date: 12/20/05 SPX1121 150mA Low DropoutVoltage Regulator © Copyright 2005 Sipex Corporation 6 EXTERNAL CAPACITORS The stability of the SPX1121 requires a 1 µF or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electro- lytic works fine here. For operations below - 25 °C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30 °C. The ESR of about 5Ω or less and resonant frequency above 500kHz are the most important parameters in the value of the capacitor. The capacitors value may be in- creased without limit. The SPX1121 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 0.1 µF tantalum 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 1 µF to 220 µF decreases the noise from 430 µV to 160µVRMS for a 100kHz bandwidth at 5V output. APPLICATIONS HINTS |
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