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PDF LT1790 Data sheet ( Hoja de datos )
| Número de pieza | LT1790 | |
| Descripción | Micropower SOT-23 Low Dropout Reference Family | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1790
Micropower SOT-23
Low Dropout Reference Family
FEATURES
DESCRIPTION
n High Accuracy:
A Grade—0.05% Max
B Grade—0.1% Max
n Low Drift:
A Grade—10ppm/°C Max
B Grade—25ppm/°C Max
n Low Thermal Hysteresis 40ppm (Typical) –40°C to 85°C
n Low Supply Current: 60µA Max
n Sinks and Sources Current
n Low Dropout Voltage
n Guaranteed Operational –40°C to 125°C
n Wide Supply Range to 18V
n Available Output Voltage Options: 1.25V, 2.048V,
2.5V, 3V, 3.3V, 4.096V and 5V
n Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
n Handheld Instruments
n Negative Voltage References
n Industrial Control Systems
n Data Acquisition Systems
n Battery-Operated Equipment
The LT®1790 is a family of SOT-23 micropower low dropout
series references that combine high accuracy and low drift
with low power dissipation and small package size. These
micropower references use curvature compensation to
obtain a low temperature coefficient and trimmed preci-
sion thin-film resistors to achieve high output accuracy. In
addition, each LT1790 is post-package trimmed to greatly
reduce the temperature coefficient and increase the output
accuracy. Output accuracy is further assured by excellent
line and load regulation. Special care has been taken to
minimize thermally induced hysteresis.
The LT1790s are ideally suited for battery-operated
systems because of their small size, low supply current
and reduced dropout voltage. These references provide
supply current and power dissipation advantages over
shunt references that must idle the entire load current to
operate. Since the LT1790 can also sink current, it can
operate as a micropower negative voltage reference with
the same performance as a positive reference.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Positive Connection for LT1790-2.5
2.6V ≤ VIN ≤ 18V
0.1µF
4 LT1790-2.5 6
1, 2
VOUT = 2.5V
1µF
1790 TA01
Typical VOUT Distribution for LT1790-2.5
50 167 UNITS
45
40 LT1790B LIMITS
35 LT1790A LIMITS
30
25
20
15
10
5
0
2.498
2.499 2.500 2.501
OUTPUT VOLTAGE (V)
2.502
1790 TA02
For more information www.linear.com/LT1790
1790fc
1
1 page  
LT1790
1 .25V ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 2.6V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Current
No Load
35 60
µA
l 75 µA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = – 1.25V, ±0.1%
100 125
µA
Turn-On Time
Output Noise (Note 8)
Long-Term Drift of Output Voltage (Note 9)
CLOAD = 1µF
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
250 µs
10 µVP-P
14 µVRMS
50 ppm/√kHr
Hysteresis (Note 10)
∆T = 0°C to 70°C
∆T = –40°C to 85°C
l 25
l 40
ppm
ppm
2 .048V ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the
specified temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 2.8V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage (Notes 3, 4)
LT1790A
2.04697
– 0.05
2.048
2.04902
0.05
V
%
LT1790B
2.04595
– 0.1
2.048
2.05005
0.1
V
%
LT1790AC
l 2.04554
l –0.12
2.048
2.05046
0.12
V
%
LT1790AI
l 2.04442
l –0.175
2.048
2.05158
0.175
V
%
LT1790BC
l 2.04237
l –0.275
2.048
2.05363
0.275
V
%
LT1790BI
l 2.03955
l –0.4125
2.048
2.05645
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
TMIN ≤ TA ≤ TMAX
LT1790A
LT1790B
l 5 10 ppm/°C
l 12 25 ppm/°C
Line Regulation
2.8V ≤ VIN ≤ 18V
50 170 ppm/V
l 220 ppm/V
Load Regulation (Note 6)
IOUT Source = 5mA
120 200 ppm/mA
l 280 ppm/mA
IOUT Sink = 3mA
130 260 ppm/mA
l 450 ppm/mA
Dropout Voltage (Note 7)
Supply Current
VIN – VOUT, ∆VOUT = 0.1%
IOUT = 0mA
IOUT Source = 5mA
IOUT Sink = 3mA
No Load
l
l
l
l
50 100
500
750
450
35 60
75
mV
mV
mV
mV
µA
µA
Minimum Operating Current—
Negative Output (See Figure 7)
VOUT = – 2.048V, 0.1%
100 125
µA
Turn-On Time
CLOAD = 1µF
350 µs
For more information www.linear.com/LT1790
1790fc
5
5 Page 
ELECTRICAL CHARACTERISTICS
Note 8: Peak-to-peak noise is measured with a single pole highpass filter
at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still
air environment to eliminate thermocouple effects on the leads. The test
time is 10 seconds. Integrated RMS noise is measured from 10Hz to 1kHz
with the HP3561A analyzer.
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 the Applications
Information section.
LT1790
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 the
Applications Information section.
1.25V TYPICAL PERFORMANCE 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
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
INPUT-OUTPUT VOLTAGE (V)
2.5
17901.25 G02
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
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
OUTPUT CURRENT (mA)
10
17901.25 G04
Load Regulation (Sinking)
2000
1800
1600
1400
1200
1000
TA = –55°C
800
600
400 TA = 125°C
200 TA = 25°C
0
0.1 1
OUTPUT CURRENT (mA)
10
17901.25 G05
For more information www.linear.com/LT1790
Supply Current vs Input Voltage
100
90
80 TA = –55°C
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
1790fc
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LT1790.PDF ] | |
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