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SPX1117T-5.0 Datasheet(PDF) 8 Page - Sipex Corporation |
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SPX1117T-5.0 Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 10 page  8 Date: 8/25/04 SPX1117 800mA Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation Output Voltage The output of the adjustable regulator can be set to any voltage between 1.25V and 15V. The value of V OUT can be quickly approximated using the formula V OUT=1.25 *(R1 + R2)/R1. A small correction to this formula is required depending on the values of resistors R 1 and R2, since the adjustable pin current (approx 50 µA) flows through R 2. When I ADJ is taken into ac- count, the formula becomes PC BOARD TOPSIDE COPPER BACKSIDE COPPER THERMAL RESISTANCE JUNC. TO AMB. mm2 mm2 mm2 °C/W 2500 2500 2500 46 2500 1250 2500 47 2500 950 2500 49 2500 2500 0 51 2500 1800 0 53 1600 600 1600 55 2500 1250 0 58 2500 915 0 59 1600 600 0 67 900 240 900 72 900 240 0 85 V OUT = VREF(1+ (R2/R1)) + IADJ * R2, where V REF=1.25V. Layout Considerations Parasitic line resistance can degrade load regu- lation. In order to avoid this, connect R 1 directly to V OUT as illustrated in Figure 25. For the same reason, R 2 should be connected to the negative side of the load. Figure 21. Current Source Figure 22. Typical Adjustable Regulator LOAD ADJ SPX1117 V IN C 1 OUT IN 4.7µF C 2 I OUT R 1 V REF R 1 I OUT = + V OUT IN OUT I ADJ SPX1117 C1 R 1 R 2 VOUT VIN C 2 V OUT =V REF (1+R 2 /R1) +I ADJ R 2 V REF 50µA ADJ 4.7µF + TABLE 1 APPLICATION INFORMATION: Continued |
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