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LT1460 Datasheet(PDF) 17 Page - Linear Technology |
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LT1460 Datasheet(HTML) 17 Page - Linear Technology |
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17 / 24 page  LT1460 17 1460f APPLICATIO S I FOR ATIO Table 1 gives the maximum output capacitance for vari- ous load currents and output voltages to avoid instability. Load capacitors with low ESR (effective series resistance) cause more ringing than capacitors with higher ESR such as polarized aluminum or tantalum capacitors. Table 1. Maximum Output Capacitance 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-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives 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 12 shows typical long-term drift of the LT1460S3s. Hysteresis Hysteresis data shown in Figure 13 and Figure 14 represents 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 relatively high power, i.e., for the LT1460S3-2.5, 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 12. Typical Long-Term Drift Figure 13. 0°C to 70°C Hysteresis Figure 14. –40°C to 85°C Hysteresis HOURS –150 –50 50 150 –100 0 100 200 400 600 800 1460 F12 1000 100 0 300 500 700 900 HYSTERESIS (ppm) –240 –160 – 80 0 8 70 °C TO 25°C0°C TO 25°C 10 12 1460 F13 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 F14 3 2 200 400 –500 –300 –100 100 300 500 1 0 9 8 7 600 WORST-CASE HYSTERESIS ON 34 UNITS |
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Similar Description - LT1460 |
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