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PDF LT1461 Data sheet ( Hoja de datos )
| Número de pieza | LT1461 | |
| Descripción | Micropower Precision Low Dropout Series Voltage Reference Family | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Trimmed to High Accuracy: 0.04% Max
s Low Drift: 3ppm/°C Max
s Low Supply Current: 50µA Max
s Temperature Coefficient Guaranteed to 125°C
s High Output Current: 50mA Min
s Low Dropout Voltage: 300mV Max
s Excellent Thermal Regulation
s Power Shutdown
s Thermal Limiting
s Operating Temperature Range: – 40°C to 125°C
s Voltage Options: 2.5V, 3V, 3.3V, 4.096V and 5V
U
APPLICATIO S
s A/D and D/A Converters
s Precision Regulators
s Handheld Instruments
s Power Supplies
TYPICAL APPLICATIO
Basic Connection
(VOUT + 0.3V) ≤ VIN ≤ 20V
CIN
1µF
LT1461
VOUT
CL
2µF
1461 TA01
LT1461
Micropower Precision
Low Dropout Series
Voltage Reference Family
DESCRIPTIO
The LT®1461 is a family of low dropout micropower bandgap
references that combine very high accuracy and low drift with
low supply current and high output drive. These series
references use advanced curvature compensation techniques
to obtain low temperature coefficient and trimmed precision
thin-film resistors to achieve high output accuracy. The
LT1461 family draws only 35µA of supply current, making
them ideal for low power and portable applications, however
their high 50mA output drive makes them suitable for higher
power requirements, such as precision regulators.
In low power applications, a dropout voltage of less than
300mV ensures maximum battery life while maintaining full
reference performance. Line regulation is nearly immeasur-
able, while the exceedingly good load and thermal regulation
will not add significantly to system error budgets. The
shutdown feature can be used to switch full load currents and
can be used for system power down. Thermal shutdown
protects the part from overload conditions. The LT1461 is
available in 2.5V, 3V, 3.3V 4.096V and 5V options.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1461-2.5 Load Regulation, PDISS = 200mW
0mA
IOUT
20mA
VOUT LOAD REG
1mV/DIV
10ms/DIV
1461 TA02
1
1 page  
LT1461
TYPICAL PERFOR A CE CHARACTERISTICS Characteristic curves are similar for most LT1461s.
Curves from the LT1461-2.5 and the LT1461-5 represent the extremes of the voltage options. Characteristic curves for other output
voltages fall between these curves and can be estimated based on their output.
2.5V Output Impedance
vs Frequency
1000
COUT = 2µF
COUT = 1µF
100
2.5V Turn-On Time
VIN
20
10
0
2.5V Turn-On Time
VIN
20
10
0
10
1
0.01
0.1 1
FREQUENCY (kHz)
10
1461 G07
2.5V Transient Response to 10mA
Load Step
IOUT
0mA
10mA/DIV
2
VOUT
1
0
CIN = 1µF
CL = 2µF
RL = ∞
TIME (100µs/DIV)
1461 G08
2.5V Line Transient Response
5V
VIN
4V
2
VOUT
1
0
CIN = 1µF
CL = 2µF
RL = 50Ω
TIME (100µs/DIV)
1461 G09
2.5V Output Noise
0.1Hz ≤ f ≤ 10Hz
VOUT
50mV/DIV
CL = 2µF
VOUT
50mV/DIV
1461 G10
CIN = 0.1µF
1461 G11
TIME (2SEC/DIV)
1461 G12
5
5 Page 
LT1461
APPLICATIO S I FOR ATIO
relative output deviation is noted. The result shown in
Figure 5a is for two LT1461S8-2.5s mounted vertically and
Figure 5b is for two LT1461S8-2.5s mounted horizontally.
The parts oriented in Figure 5a impart less stress into the
package because stress is absorbed in the leads. Figures
5a and 5b show the deviation to be between 125µV and
250µV and implies a 50ppm and 100ppm change respec-
tively. This corresponds to a 13- to 14-bit system and is
not a problem for most 10- to 12-bit systems unless the
system has a calibration. In this case, as with temperature
hysteresis, this low level can be important and even more
careful techniques are required.
The most effective technique to improve PC board stress
is to cut slots in the board around the reference to serve as
a strain relief. These slots can be cut on three sides of the
reference and the leads can exit on the fourth side. This
“tongue” of PC board material can be oriented in the long
direction of the board to further reduce stress transferred
to the reference.
The results of slotting the PC boards of Figures 5a and
5b are shown in Figures 6a and 6b. In this example the
slots can improve the output shift from about 100ppm to
nearly zero.
22
11
0 LONG DIMENSION
–1
0 10 20 30
FLEXURE NUMBER
Figure 5a. Two Typical LT1461S8-2.5s,
Vertical Orientation Without Slots
2
40
1461 F05a
0
SLOT
–1
0 10 20 30 40
FLEXURE NUMBER
1461 F06a
Figure 6a. Same Two LT1461S8-2.5s in Figure 5a, but with Slots
2
11
0 LONG DIMENSION
–1
0 10 20 30
FLEXURE NUMBER
Figure 5b. Two Typical LT1461S8-2.5s,
Horizontal Orientation Without Slots
0
SLOT
40
1461 F05b
–1
0 10 20 30 40
FLEXURE NUMBER
1461 F06b
Figure 6b. Same Two LT1461S8-2.5s in Figure 5b, but with Slots
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1461.PDF ] | |
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