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LT1460JCS3-5 Datasheet(PDF) 9 Page - Linear Technology |
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LT1460JCS3-5 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1460S3 (SOT-23) APPLICATIONS INFORMATION Hysteresis Hysteresis data shown in Figure 5 and Figure 6 represents the worst-case data taken on parts from 0 °C to 70°C and from – 40 °C to 85°C. The output 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. Fast Turn-On It is recommended to add a 0.1 µF or larger bypass capacitor to the input pin of the LT1460S3s. Although this can help stability with large load currents, another reason is for proper start-up. The LT1460S3 can start in 10 µs, but it is important to limit the dv/dt of the input. Under light load conditions and with a very fast input, internal nodes overslew and this requires finite recovery time. Figure 8 shows the result of no bypass capacitance on the input and no output load on the LT1460S3-5. In this case the supply dv/dt is 7.5V in 30ns which causes internal overslew, and the output does not bias to 5V until 40 µs after turn-on. Although 40 µs is a typical turn-on time, it can be much longer. Figure 9 shows the effect of a 0.1 µF bypass capacitor which limits the input dv/dt to approximately 7.5V in 20 µs. The part always starts quickly. Figure 6. 0 °C to 70°C Hysteresis Figure 7. – 40 °C to 85°C Hysteresis VIN 20 µs/DIV Figure 8. CIN = 0µF 0V VOUT 0V 7.5V 1460S3 F08 VIN 20 µs/DIV Figure 9. CIN = 0.1µF VOUT 0V 7.5V 1460S3 F08 HYSTERESIS (ppm) –240 –160 – 80 0 8 70 °C TO 25°C0°C TO 25°C 10 12 1460S3 F06 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 1460S3 F07 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 - LT1460JCS3-5 |
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