LT1790A Ver la hoja de datos (PDF) - Linear Technology
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LT1790A Datasheet PDF : 24 Pages
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LT1790
ELECTRICAL CHARACTERISTICS
Note 9: Long-term drift typically has a logarithmic characteristic and
therefore changes after 1000 hours tend to be smaller than before that
time. Long-term drift is affected by differential stress between the IC and
the board material created during board assembly. See Applications
Information.
Note 10: Hysteresis in the output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled to 85°C or – 40°C before a successive measurements. Hysteresis is
roughly proportional to the square of the temperature change. Hysteresis
is not a problem for operational temperature excursions where the
instrument might be stored at high or low temperature. See Applications
Information.
1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Output Voltage Temperature Drift
1.253
FOUR TYPICAL PARTS
1.252
1.251
1.250
1.249
1.248
1.247
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
17091.25 G01
Load Regulation (Sourcing)
0
–200
TA = –55°C
–400
–600
TA = 25°C
–800
–1000
TA = 125°C
–1200
–1400
–1600
–1800
–2000
0.1
1
10
OUTPUT CURRENT (mA)
17901.25 G04
Minimum Input-Output Voltage
Differential (Sourcing)
10
TA = 125°C
1
TA = –55°C
TA = 25°C
0.1
0
0.5
1
1.5
2
2.5
INPUT-OUTPUT VOLTAGE (V)
17901.25 G02
Load Regulation (Sinking)
2000
1800
1600
1400
1200
1000
TA = –55°C
800
600
TA = 125°C
400
200
TA = 25°C
0
0.1
1
10
OUTPUT CURRENT (mA)
17901.25 G05
Minimum Input-Output Voltage
Differential (Sinking)
1.0
0.9
0.8
100µA
5mA
0.7
1mA
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
17091.25 G03
Supply Current vs Input Voltage
100
90
TA = –55°C
80
70
TA = 25°C
60
50
TA = 125°C
40
30
20
10
0
0
5
10
15
20
INPUT VOLTAGE (V)
17901.25 G06
1790fa
10
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