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SPX3819M3-3.3 Datasheet(PDF) 7 Page - Sipex Corporation |
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SPX3819M3-3.3 Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 12 page  7 Date:6/8/2004 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation The SPX3819 requires an output capacitor for device stability. Its value depends upon the application circuit. In general, linear regulator stability decreases with higher output currents. In applications where the SPX3819 is putting out less current, a lower output capacitance may be sufficient. For example, a regulator sourcing only 10mA, requires approximately half the capacitance as the same regulator sourcing 150mA. Bench testing is the best method for determining the proper type and value of the capacitor since the high frequency characteristics of electro- lytic capacitors vary widely, depending on type and manufacturer. A high quality 2.2 µF alumi- num electrolytic capacitor works in most appli- cation circuits, but the same stability often can be obtained with a 1 µF tantalum electrolytic. With the SPX3819 adjustable version, the mini- mum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since closed loop gain is increased. Typical Applications Circuits A 10nF capacitor on BYP pin will significantly reduce output noise but it may be left uncon- nected if the output noise is not a major concern. The SPX3819 start-up speed is inversely pro- portional to the size of the BYP capacitor. Ap- plications requiring a slow ramp-up of the out- put voltage should use a larger CBYP. However, if a rapid turn-on is necessary, the BYP capaci- tor can be omitted. The SPX3819’s internal reference is available through the BYP pin. Figure 1 represents a SPX3819 standard appli- cation circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable the regulator, EN < 0.4V. The SPX3819 in Figure 2 illustrates a typical adjustable output voltage configuration. Two resistors (R1 and R2) set the output voltage. The output voltage is calculated using the formula: VOUT = 1.235V x [ 1 + R1/R2] R2 must be > 10 kΩ and for best results, R2 should be between 22 k Ω and 47kΩ. A capacitor placed between Adj and ground will provide improved noise performance. APPLICATION INFORMATION + + GND EN BYP (Opt.) ENABLE may be tied directly to V IN SPX3819 1 2 3 4 5 V IN V OUT TOP View + + GND EN BYP (Opt.) Hi-ON Lo-OFF SPX3819 SOT-23 1 2 3 4 5 V IN V OUT R1 R2 ADJ TOP View Figure 1. Standard Application Circuit Figure 2. Typical Adjustable Output Voltage Configuration |
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