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PDF LT1790-2.5 Data sheet ( Hoja de datos )
| Número de pieza | LT1790-2.5 | |
| Descripción | 2.5V Micropower SOT-23 Low Dropout Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s High Accuracy:
A Grade—0.05% Max
B Grade—0.1% Max
s Low Drift:
A Grade—10ppm/°C Max
B Grade—25ppm/°C Max
s Low Supply Current: 60µA Max
s Sinks and Sources: 5mA Min
s Low Dropout Voltage
s Guaranteed Operational –40°C to 125°C
s Wide Supply Range: 2.6V to 18V
U
APPLICATIO S
s Handheld Instruments
s Negative Voltage References
s Industrial Control Systems
s Data Acquisition Systems
s Battery-Operated Equipment
Final Electrical Specifications
LT1790-2.5
2.5V Micropower SOT-23
Low Dropout Reference
March 2000
DESCRIPTIO
The LT®1790-2.5 is a SOT-23 micropower low dropout
series reference that combines high accuracy and low drift
with low power dissipation and small package size. This
micropower reference uses curvature compensation to
obtain a low temperature coefficient and trimmed preci-
sion thin-film resistors to achieve high output accuracy. In
addition, the LT1790-2.5 uses post-package trimming 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 LT1790-2.5 is ideally suited for battery-operated
systems because of its small size, low supply current and
reduced dropout voltage. This reference provides supply
current and power dissipation advantages over shunt
references that must idle the entire load current to operate.
However, since the LT1790-2.5 can also sink current, it
can operate as a micropower negative voltage reference
with the same performance as a positive reference.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Positive Connection
2.6V ≤ VIN ≤ 18V
0.1µF
46
LT1790-2.5
1, 2
VOUT = 2.5V
1µF
1790 TA01
Typical VOUT Distribution
50
167 UNITS
45
40
LT1790BC LIMITS
35
LT1790AC LIMITS
30
25
20
15
10
5
0
2.498
2.499 2.500 2.501
OUTPUT VOLTAGE (V)
2.502
1790 TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
1 page  
LT1790-2.5
APPLICATIONS INFORMATION
Bypass and Load Capacitors
The LT1790-2.5 voltage reference should have an input
bypass capacitor of 0.1µF or larger, however the bypass-
ing of other local devices may serve as the required
component. This reference also requires an output capaci-
tor for stability. The optimum output capacitance for most
applications is 1µF, although larger values work as well.
This capacitor affects the turn-on and settling time for the
output to reach its final value.
Figure 1 shows the turn-on time for the LT1790-2.5 with
a 1µF input bypass and 1µF load capacitor. Figure 2 shows
the output response to a 0.5V transient on VIN with the
same capacitors.
The test circuit of Figure 3 is used to measure the stability
of various load currents. With RL = 1k, the 1V step
produces a current step of 1mA. Figure 4 shows the
response to a ±0.5mA load. Figure 5 is the output re-
sponse to a sourcing step from 4mA to 5mA, and Figure
6 is the output response of a sinking step from – 4mA to
– 5mA.
VIN
3V
4
CIN
0.1µF
LT1790-2.5
6
1k
CL
1µF
VGEN
1V
1, 2
1790 F03
Figure 3. Response Time Test Circuit
VGEN
3V VIN 3V
2V
VOUT
2V
1V
0V VOUT
1790 F01
Figure 1. Turn-On Characteristics of LT1790-2.5
3V VIN
2V VOUT
1V
0V
1790 F02
Figure 2. Output Response to 0.5V Ripple on VIN
1790 F04
Figure 4. LT1790-2.5 Sourcing and Sinking 0.5mA
VGEN
–2V
–3V
VOUT
1790 F05
Figure 5. LT1790-2.5 Sourcing 4mA to 5mA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1790-2.5.PDF ] | |
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