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LT1460EIS8-2.5-PBF Datasheet(PDF) 18 Page - Linear Technology |
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LT1460EIS8-2.5-PBF Datasheet(HTML) 18 Page - Linear Technology |
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18 / 26 page  LT1460 1460fc Table 1. Maximum Output Capacitance for LT1460S3 VOLTAGE OPTION IOUT = 100µA IOUT = 1mA IOUT = 10mA IOUT = 20mA 2.5V >10µF >10µF 2µF 0.68µF 3V >10µF >10µF 2µF 0.68µF 3.3V >10µF >10µF 1µF 0.68µF 5V >10µF >10µF 1µF 0.68µF 10V >10µF 1µF 0.15µF 0.1µF Long-Term Drift Long-termdriftcannotbeextrapolatedfromaccelerated hightemperaturetesting.Thiserroneoustechniquegives drift numbers that are wildly optimistic. The only way long-term drift can be determined is to measure it over the time interval of interest. The LT1460S3 long-term drift data was taken on over 100 parts that were soldered into PC boards similar to a “real world” application. The boards were then placed into a constant temperature oven with TA = 30°C, their outputs were scanned regularly and measured with an 8.5 digit DVM. Figure 16 shows typical long-term drift of the LT1460S3s. Hysteresis HysteresisdatashowninFigure17andFigure18represents the worst-case data taken on parts from 0°C to 70°C and from –40°C to 85°C. The device is capable of dissipating relativelyhighpower,i.e.,fortheLT1460S3-2.5,PD=17.5V • 20mA = 350mW. The thermal resistance of the SOT-23 package is 325°C/W and this dissipation causes a 114°C internal rise producing a junction temperature of TJ=25°C + 114°C = 139°C. This elevated temperature will cause the output to shift due to thermal hysteresis. For highest performance in precision applications, do not let the LT1460S3’s junction temperature exceed 85°C. Figure 16. Typical Long-Term Drift Figure 17. 0°C to 70°C Hysteresis Figure 18. –40°C to 85°C Hysteresis HOURS –150 –50 50 150 –100 0 100 200 400 600 800 1460 F16 1000 100 0 300 500 700 900 HYSTERESIS (ppm) –240 –160 –80 0 8 70°C TO 25°C 0°C TO 25°C 10 12 1460 F17 6 4 80 160 –200 –120 –40 40 120 200 2 0 18 16 14 240 WORST-CASE HYSTERESIS ON 40 UNITS HYSTERESIS (ppm) –600 –400 –200 0 4 85°C TO 25°C –40°C TO 25°C 5 6 1460 F18 3 2 200 400 –500 –300 –100 100 300 500 1 0 9 8 7 600 WORST-CASE HYSTERESIS ON 34 UNITS applications inForMation |
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