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SPX1202T-3.0 Datasheet(PDF) 5 Page - Sipex Corporation |
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SPX1202T-3.0 Datasheet(HTML) 5 Page - Sipex Corporation |
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5 / 11 page  5 Date: 5/25/04 SPX1202 600mA Low Dropout Positive Linear Regulator © Copyright 2004 Sipex Corporation PC BOARD TOPSIDE COPPER BACKSIDE COPPER THERMAL RESISTANCE AREA mm2 AREA mm2 AREA mm2 JUNCTION TO AMBIENT °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 Figure 8. 600mA Current Source Figure 9. Typical Adjustable Regulator LOAD ADJ SPX1202 V IN C 1 OUT IN 4.7µF C 2 I OUT R 1 V REF R 1 I OUT = + IN OUT I ADJ SPX1202 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 + tude of the output ripple will be independent of the output voltage. If an ADJ-bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: M = V OUT / VREF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. V REF =1.25V 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. (Figure 9) V OUT=1.25 *(R1 + R2)/R1. A small correction to this formula is required depending on the values of resistors R1 and R2, since adjustable pin current (approx 50 µA) flows through R2. When I ADJ is taken into account, the formula becomes V OUT = VREF(1+ (R2/R1)) + IADJ * R2, where V REF=1.25V. TYPICAL APPLICATIONS Table 1 |
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