LT1460 Ver la hoja de datos (PDF) - Linear Technology
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LT1460 Datasheet PDF : 26 Pages
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LT1460
Applications Information
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-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 16 shows typical
long-term drift of the LT1460S3s.
150
100
50
0
–50
–100
–150
0
100 200 300 400 500 600 700 800 900 1000
HOURS
1460 F16
Figure 16. Typical Long-Term Drift
Hysteresis
Hysteresis data shown in Figure 17 and Figure 18 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.
18
WORST-CASE HYSTERESIS
16 ON 40 UNITS
14
12
10
70°C TO 25°C
0°C TO 25°C
8
6
4
2
0
–240 –200 –160 –120 –80 –40 0 40 80 120 160 200 240
HYSTERESIS (ppm)
1460 F17
Figure 17. 0°C to 70°C Hysteresis
9
WORST-CASE HYSTERESIS
8 ON 34 UNITS
7
85°C TO 25°C
–40°C TO 25°C
6
5
4
3
2
1
0
–600 –500 –400 –300 –200 –100 0 100 200 300 400 500 600
HYSTERESIS (ppm)
1460 F18
Figure 18. –40°C to 85°C Hysteresis
1460fc
18
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