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SPX1521M3-3.3 Datasheet(PDF) 3 Page - Sipex Corporation |
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SPX1521M3-3.3 Datasheet(HTML) 3 Page - Sipex Corporation |
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3 / 6 page  3 Date: 5/25/04 SPX1521 300mA Low Dropout Voltage Regulator ©Copyright 2004 Sipex Corporation External Capacitors The stability of the SPX1521 requires a 2.2 µF 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 5Ω 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 SPX1521, 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 220µF only decreases the noise from 430 µV to 160µVrms for a 100kHz band- width at 5V output. APPLICATION INFORMATION Top View SPX1521 13 2 SOT-223 (M3) Top View TO-263-3 (T) 1 SPX1521 2 3 Front View TO-220-3 (U) SPX1521 12 3 Front View TO-252 (R) 3 2 1 V IN GND V OUT V OUT GND V IN V OUT GND V IN V OUT GND V IN PINOUTS |
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