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SPX8863M5-3.3 Datasheet(PDF) 4 Page - Sipex Corporation |
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SPX8863M5-3.3 Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 9 page Rev. 10/24/00 V OUT GND SPX8863 Top View EN BYP (Optn) V IN + + Fig. 1 Hi-ON Lo-OFF 3 2 1 4 5 SPX8863 Application Hints The SPX8863 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 quality 2.2 µF aluminum electrolytic capacitor covers all general application circuits, this stability can be obtained with a tantalum electrolytic value of 1 µF. In general, linear regulator stability decreases with higher output currents. In some applications the SPX8863 may operate at few milliamps. In these applications the output capacitance can be further reduced. For example, when the regulator is running at 10mA output current the output capacitance value is half compared to the same regulator that is running at 150mA. With the SPX8863 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since the closed loop gain is increased. Typical Applications Circuits The SPX8863 provides access to the internal reference. A 10 µF capacitor on the BYP pin will provide a significant reduction in output noise. This pin may be left unconnected if the output noise is not a major concern. The SPX8863 start-up speed is inversely proportional to the size of its capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of CBYP. If the rapid turn-ON is necessary, omit bypass capacitor. Figure 1 shows SPX8863 standard application circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable the regulator, EN < 0.6V. The SPX8863 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output voltage is: VOUT = 1.235V x (1+ R1) Resistor values are not critical as the Adj. pin has high input impedance, for best results use resistors of 47k Ω or less. A capacitor for Adj to ground will provide improved noise performance. R2 V IN V OUT GND Top View EN Byp (Optn) + + ADJ R1 R2 Fig. 2 Hi-ON Lo-OFF SPX8863 1 2 34 5 |
Similar Part No. - SPX8863M5-3.3 |
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Similar Description - SPX8863M5-3.3 |
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