LT1460ACN8-2.5 Linear Technology, LT1460ACN8-2.5 Datasheet - Page 18

• Manufacturer Part Number: LT1460ACN8-2.5
• Description: IC PREC SERIES REF MICRPWR 8-DIP
• Manufacturer: Linear Technology

Specifications of LT1460ACN8-2.5

• Reference Type: Series
• Voltage - Output: 2.5V
• Tolerance: ±0.075%
• Temperature Coefficient: 10ppm/°C
• Voltage - Input: 3.4 ~ 20 V
• Number Of Channels: 1
• Current - Quiescent: 130µA
• Current - Output: 40mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Cathode: -

applications inForMation
LT1460
Table 1. Maximum Output Capacitance for LT1460S3
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 T
measured with an 8.5 digit DVM. Figure 16 shows typical
long-term drift of the LT1460S3s.

VOLTAGE
OPTION
2.5V
3.3V
10V
3V
5V
A
= 30°C, their outputs were scanned regularly and
–100
–150
I
150
100
–50
OUT
50
0
>10µF
>10µF
>10µF
>10µF
>10µF
Figure 16. Typical Long-Term Drift
0
= 100µA
100
200
300
I
OUT
400
>10µF
>10µF
>10µF
>10µF
1µF
HOURS
= 1mA
500
600
700
I
OUT
800
0.15µF
2µF
2µF
1µF
1µF
= 10mA I
900
1460 F16
1000
OUT
0.68µF
0.68µF
0.68µF
0.68µF
0.1µF
= 20mA
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 T
+ 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.
12
10
18
16
14
6
8
6
4
0
9
8
7
5
4
3
2
0
2
1
–240
–600
WORST-CASE HYSTERESIS
ON 40 UNITS
WORST-CASE HYSTERESIS
ON 34 UNITS
–200
–500
Figure 18. –40°C to 85°C Hysteresis
–160
–400
Figure 17. 0°C to 70°C Hysteresis
85°C TO 25°C
–120
–300
70°C TO 25°C
–200
–80
HYSTERESIS (ppm)
HYSTERESIS (ppm)
–100
–40
0
0
100
40
0°C TO 25°C
–40°C TO 25°C
200
80
120
300
160
400
200
500
J
= 25°C
1460 F17
1460 F18
240
600
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