LT1460JCS3-2.5#PBF Linear Technology, LT1460JCS3-2.5#PBF Datasheet - Page 18

• Manufacturer Part Number: LT1460JCS3-2.5#PBF
• Manufacturer: Linear Technology

Specifications of LT1460JCS3-2.5#PBF

• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 2.5V
• Temperature Coefficient: 20ppm/°C
• Reference Voltage Accuracy (max): 0.4
• Line Regulation: 800ppm/V
• Load Regulation: 3000ppm/mA
• Input Voltage (max): 30V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 3
• Package Type: SOT-23
• Lead Free Status / RoHS Status: Compliant

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
1460fc