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LT1460-5 데이터시트 PDF




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부품번호 LT1460-5 기능
기능 Micropower Precision Series Reference
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LT1460-5 데이터시트, 핀배열, 회로
LT1460-5
Micropower Precision
Series Reference
FEATURES
s High Accuracy: 0.075% Max
s Low Drift: 10ppm/°C Max
s Industrial Temperature Range SO-8 Package
s Temperature Coefficient Guaranteed to 125°C
s Low Supply Current: 175µA Max
s Minimum Output Current: 20mA
s No Output Capacitor Required
s Reverse Battery Protection
s Minimum Input/Output Differential: 0.9V
s Available in SmaUll MSOP Package
APPLICATIO S
s Handheld Instruments
s Precision Regulators
s A/D and D/A Converters
s Power Supplies
s Hard Disk Drives
TYPICAL APPLICATIO
Basic Connection
5.9V
TO 20V
LT1460-5
IN OUT
C1
0.1µF
GND
5V
1460-5 TA01
DESCRIPTIO
The LT®1460-5 is a micropower bandgap reference that
combines very high accuracy and low drift with low power
dissipation and small package size. This series reference
uses curvature compensation to obtain a low temperature
coefficient and trimmed precision thin-film resistors to
achieve high output accuracy. The reference will supply up to
20mA, making it ideal for precision regulator applications, yet
it is almost totally immune to input voltage variations.
This series reference provides supply current and power
dissipation advantages over shunt references that must idle
the entire load current to operate. Additionally, the LT1460-5
is stable with capacitive loads and does not require an output
capacitor. This feature is important in critical applications
where PC board space is a premium or fast settling is
demanded. Reverse battery protection keeps the reference
from conducting current and being damaged.
The LT1460-5 is available in the 8-lead MSOP, SO, PDIP
and the 3-lead TO-92 packages. It is also available in the
SOT-23 package; see separate data sheet LT1460S3-5
(SOT-23).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Typical Distribution of Output Voltage
S8 Package
20
18 1400 PARTS
FROM 2 RUNS
16
14
12
10
8
6
4
2
0
–0.10
–0.06 –0.02 0 0.02 0.06 0.10
OUTPUT VOLTAGE ERROR (%)
1460-5 TA02
1




LT1460-5 pdf, 반도체, 판매, 대치품
LT1460-5
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature
range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 3: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1460, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 4: Temperature coefficient is measured by dividing the change in
output voltage by the specified temperature range. Incremental slope is
also measured at 25°C.
Note 5: Load regulation is measured on a pulse basis from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 6: Thermal regulation is caused by die temperature gradients created
by load current or input voltage changes. This effect must be added to
normal line or load regulation. This parameter is not 100% tested.
Note 7: Excludes load regulation errors.
Note 8: Peak-to-peak noise is measured with a single 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 sec. RMS noise is measured with a single highpass filter at 10Hz and
a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified
and then integrated for a fixed period, making the final reading an average
as opposed to RMS. A correction factor of 1.1 is used to convert from
average to RMS and a second correction of 0.88 is used to correct for the
nonideal bandpass of the filters.
Note 9: Long-term stability typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before
that time. Total drift in the second thousand hours is normally less than
one third that of the first thousand hours with a continuing trend toward
reduced drift with time. Significant improvement in long-term drift can be
realized by preconditioning the IC with a 100 hour to 200 hour, 125°C
burn-in. Long-term stability will also be affected by differential stresses
between the IC and the board material created during board assembly. See
PC Board Layout in the Applications Information section.
Note 10: Hysteresis in 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 successive measurements. Hysteresis is
roughly proportional to the square of the temperature change. Hysteresis
is not normally a problem for operational temperature excursions where
the instrument might be stored at high or low temperature.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input-Output Voltage
Differential
100
125°C
25°C
10
–55°C
1
0.1
0
0.5 1.0 1.5 2.0
INPUT-OUTPUT VOLTAGE (V)
2.5
1460-5 G01
Load Regulation, Sourcing
6
5
4
125°C 25°C
3
2
– 55°C
1
0
0.1
1 10
OUTPUT CURRENT (mA)
100
1460-5 G02
4

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LT1460-5 전자부품, 판매, 대치품
LT1460-5
APPLICATIONS INFORMATION
capacitance on the input and no output load. In this case
the supply dv/dt is 7.5V in 30ns which causes internal
overslew, and the output does not bias to 5V until 45µs.
Although 45µs is a typical turn-on time, it can be much
longer. A 0.1µF input capacitor guarantees the part always
starts quickly as shown in Figure 5.
7.5V
VIN
0V
For temperature 0°C to 70°C the maximum T = 70°C,
( )( )VOUT
=
10ppm
 °C 
70°C
5V
= 3.5mV
which is 0.07%.
Total worst-case output error is:
0.075% + 0.035% + 0.070% = 0.180%.
Table 1 gives worst-case accuracy for the LT1460AC, CC,
DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI
from – 40°C to 85°C.
VOUT
0V
20µs/DIV
Figure 5. CIN = 0.1µF
1460-5 F04
Output Accuracy
Like all references, either series or shunt, the error budget
of the LT1460-5 is made up of primarily three compo-
nents: initial accuracy, temperature coefficient and load
regulation. Line regulation is neglected because it typically
contributes only 30ppm/V, or 150µV for a 1V input change.
The LT1460-5 typically shifts less than 0.01% when
soldered into a PCB, so this is also neglected (see PC
Board Layout section). The output errors are calculated as
follows for a 100µA load and 0°C to 70°C temperature
range:
LT1460AC
Initial accuracy = 0.075%
For IO = 100µA,
( )( )VOUT
=

3500ppm
mA 
0.1mA
5V
= 1.75mV
which is 0.035%.
PC Board Layout
In 13- to 16-bit systems where initial accuracy and tem-
perature coefficient calibrations have been done, the
mechanical and thermal stress on a PC board (in a cardcage
for instance) can shift the output voltage and mask the true
temperature coefficient of a reference. In addition, the
mechanical stress of being soldered into a PC board can
cause the output voltage to shift from its ideal value.
Surface mount voltage references (MS8 and S8) are the
most susceptible to PC board stress because of the small
amount of plastic used to hold the lead frame.
A simple way to improve the stress-related shifts is to
mount the reference near the short edge of the PC board,
or in a corner. The board edge acts as a stress boundary,
or a region where the flexure of the board is minimum. The
package should always be mounted so that the leads
absorb the stress and not the package. The package is
generally aligned with the leads parallel to the long side of
the PC board as shown in Figure 7a.
A qualitative technique to evaluate the effect of stress on
voltage references is to solder the part into a PC board and
deform the board a fixed amount as shown in Figure 6. The
flexure #1 represents no displacement, flexure #2 is
concave movement, flexure #3 is relaxation to no dis-
placement and finally, flexure #4 is a convex movement.
IOUT
0
100µA
10mA
20mA
LT1460AC
0.145%
0.180%
0.325%
0.425%
LT1460BI
0.225%
0.260%
0.405%
N/A
LT1460CC
0.205%
0.240%
0.385%
0.485%
LT1460DC
0.240%
0.275%
0.420%
0.520%
LT1460EI
0.375%
0.410%
0.555%
N/A
LT1460FC
0.325%
0.360%
0.505%
0.605%
LT1460GC
0.425%
0.460%
0.605%
0.705%
LT1460GI
0.562%
0.597%
0.742%
N/A
7

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