LT1460ACS8-10 [Linear]
Micropower Precision Series Reference; 微功率精准串联基准型号: | LT1460ACS8-10 |
厂家: | Linear |
描述: | Micropower Precision Series Reference |
文件: | 总12页 (文件大小:290K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1460-10
Micropower Precision
Series Reference
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FEATURES
DESCRIPTION
The LT®1460-10 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
achievehighoutputaccuracy. Thereferencewillsupplyupto
20mA,makingitidealforprecisionregulatorapplications,yet
it is almost totally immune to input voltage variations.
■
High Accuracy: 0.075% Max
■
Low Drift: 10ppm/°C Max
■
■
■
■
■
■
■
Industrial Temperature Range SO-8 Package
Low Supply Current: 270µA Max
Minimum Output Current: 20mA
No Output Capacitor Required
Reverse Battery Protection
Minimum Input/Output Differential: 0.9V
Available in Small MSOP Package
This series reference provides supply current and power
dissipation advantages over shunt references that must idle
theentireloadcurrenttooperate. Additionally, theLT1460-10
does not require an output capacitor, but it is stable with
capacitive loads. This feature is important in critical applica-
tions where PC board space is a premium or fast settling is
demanded. Reverse battery protection keeps the reference
from conducting current and being damaged.
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APPLICATIONS
■
Handheld Instruments
Precision Regulators
A/D and D/A Converters
Power Supplies
Hard Disk Drives
■
■
■
■
The LT1460-10 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 LT1460S3-10
(SOT-23).
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Typical Distribution of Output Voltage
S8 Package
20
1400 PARTS
18
FROM 2 RUNS
16
Basic Connection
14
12
10
8
LT1460-10
10.9V
10V
IN
OUT
TO 20V
GND
C1
0.1µF
1460-10 TA01
6
4
2
0
–0.10
–0.06 –0.02 0 0.02
0.06
0.10
OUTPUT VOLTAGE ERROR (%)
1460-10 TA02
1
LT1460-10
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ABSOLUTE MAXIMUM RATINGS
Input Voltage ........................................................... 30V
Reverse Voltage.................................................... –15V
Output Short-Circuit Duration, TA = 25°C ............. 5 sec
Specified Temperature Range
Storage Temperature Range (Note 1) ... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Commercial ............................................ 0°C to 70°C
Industrial ........................................... –40°C to 85°C
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PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
BOTTOM VIEW
NC* 1
8 NC*
7 NC*
NC*
1
2
3
4
NC*
NC*
8
7
6
5
3
2
1
V
2
IN
*
CONNECTED INTERNALLY.
DO NOT CONNECT
EXTERNAL CIRCUITRY
TO THESE PINS
6 V
V
NC* 3
GND 4
OUT
IN
V
V
OUT
GND
IN
5 NC*
NC*
GND
V
OUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
NC*
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
Z PACKAGE
3-LEAD TO-92 PLASTIC
TJMAX = 150°C, θJA = 160°C/ W
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
TJMAX = 150°C, θJA = 250°C/ W
ORDER PART NUMBER
ORDER PART NUMBER
ORDER PART NUMBER
LT1460CCMS8-10
LT1460FCMS8-10
LT1460ACN8-10
LT1460BIN8-10
LT1460DCN8-10
LT1460EIN8-10
LT1460ACS8-10
LT1460BIS8-10
LT1460DCS8-10
LT1460EIS8-10
LT1460GCZ-10
LT1460GIZ-10
MS8 PART MARKING
S8 PART MARKING
LTAH
LTAJ
1460A1
460BI1
1460D1
460EI1
Consult factory for Military grade parts.
Available Options
TEMPERATURE
COEFFICIENT
PACKAGE TYPE
ACCURACY
N8
S8
MS8
Z
TEMPERATURE
0°C to 70°C
(%)
0.075
0.10
0.10
0.10
0.125
0.15
0.25
0.25
(ppm/°C)
10
LT1460ACN8-10
LT1460BIN8-10
LT1460ACS8-10
LT1460BIS8-10
–40°C to 85°C
0°C to 70°C
10
15
LT1460CCMS8-10
LT1460FCMS8-10
0°C to 70°C
20
LT1460DCN8-10
LT1460EIN8-10
LT1460DCS8-10
LT1460EIS8-10
–40°C to 85°C
0°C to 70°C
20
25
0°C to 70°C
25
LT1460GCZ-10
LT1460GIZ-10
–40°C to 85°C
25
2
LT1460-10
ELECTRICAL CHARACTERISTICS
VIN = 12.5V, IOUT = 0, TA = 25°C unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Note 2)
LT1460ACN8, ACS8
9.9925
–0.075
10.000 10.0075
0.075
V
%
LT1460BIN8, BIS8, CCMS8, DCN8, DCS8
LT1460EIN8, EIS8
9.990
–0.10
10.000 10.010
0.10
V
%
9.9875
–0.125
10.000 10.0125
0.125
V
%
LT1460FCMS8
9.985
–0.15
10.000 10.015
0.15
V
%
LT1460GCZ, GIZ
9.975
–0.25
10.000 10.025
0.25
V
%
Output Voltage Temperature Coefficient (Note 3)
T
≤ T ≤ T
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
MIN J MAX
●
●
●
●
5
7
10
12
10
15
20
25
ppm/°C
ppm/°C
ppm/°C
ppm/°C
Line Regulation
10.9V ≤ V ≤ 12.5V
30
60
80
ppm/V
ppm/V
IN
●
●
●
●
●
12.5V ≤ V ≤ 20V
10
25
35
ppm/V
ppm/V
IN
Load Regulation Sourcing (Note 4)
I
I
I
= 100µA
= 10mA
= 20mA
1500
80
2800
3500
ppm/mA
ppm/mA
OUT
OUT
OUT
135
180
ppm/mA
ppm/mA
70
100
140
ppm/mA
ppm/mA
0°C to 70°C
Thermal Regulation (Note 5)
Dropout Voltage (Note 6)
∆P = 200mW
0.5
2.5
0.9
ppm/mW
V
V
IN
V
IN
– V , ∆V
≤ 0.1%, I
≤ 0.1%, I
= 0
●
●
OUT
OUT
OUT
OUT
OUT
– V , ∆V
= 10mA
1.3
1.4
V
V
OUT
Output Current
Reverse Leakage
Supply Current
Short V
to GND
40
0.5
190
mA
OUT
V
IN
= –15V
●
●
10
µA
270
360
µA
µA
Output Voltage Noise (Note 7)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
40
35
µV
P-P
µV
RMS
Long-Term Stability of Output Voltage, S8 Pkg (Note 8)
Hysteresis (Note 9)
40
ppm/√kHr
∆T = –40°C to 85°C
∆T = 0°C to 70°C
160
25
ppm
ppm
The
range.
●
denotes specifications which apply over the specified temperature
Note 3: 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 1: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 4: 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 5: 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 2: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1460-10, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
3
LT1460-10
ELECTRICAL CHARACTERISTICS
Note 6: Excludes load regulation errors.
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 9: 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.
Note 7: 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 8: 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
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TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input/Output
Voltage Differential
Load Regulation, Sourcing
Load Regulation, Sinking
100
10
10
9
100
90
80
70
60
50
40
30
20
10
0
8
7
25°C
6
5
125°C
25°C
–55°C
125°C
4
3
2
1
0
–55°C
25°C
125°C
1
–55°C
0.1
0
0.5
1.0
1.5
2.0
2.5
0
1
3
4
5
2
0.1
1
10
100
INPUT/OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460-10 G02
1460-10 G01
1460-10 G03
Output Voltage Temperature Drift
Supply Current vs Input Voltage
Line Regulation
10.006
10.002
9.998
9.994
9.990
9.986
9.982
10.004
10.000
9.996
9.992
9.988
9.984
9.980
400
360
320
280
240
200
160
120
80
3 TYPICAL PARTS
25°C
–55°C
25°C
–55°C
125°C
125°C
40
0
–50
0
25
50
75
100
–25
0
2
4
6
12 14 16 18 20
6
8
14
16
18
20
8
10
10
12
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460-10 G04
1460-10 G05
1460-10 G06
4
LT1460-10
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TYPICAL PERFORMANCE CHARACTERISTICS
Power Supply Rejection Ratio
vs Frequency
Output Impedance vs Frequency
Transient Responses
100
90
80
70
60
50
40
30
20
10
0
1000
100
10
10
1
C = 0µF
L
C = 0.1µF
L
0.1
0
C = 1µF
L
1
1460-10 G09
IOUT = 10mA
200µs/DIV
0.1
0.01
0.1
1
10
100
1000
0.1
1
10
100
1000
INPUT FREQUENCY (kHz)
FREQUENCY (kHz)
1460-10 G07
1460-10 G08
Output Voltage Noise Spectrum
Output Noise 0.1Hz to 10Hz
10
1
0.1
0.01
0.1
1
10
100
0
2
4
6
8
10
12
14
FREQUENCY (kHz)
TIME (SEC)
1460-10 G10
1460-10 G11
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APPLICATIONS INFORMATION
Precision Regulator
Capacitive Loads
The LT1460-10 is ideal as a precision regulator, and since The LT1460-10 is designed to be stable with capacitive
it operates in series mode it does not require a current loads. With no capacitive load, the reference is ideal for
setting resistor. The reference can supply up to 20mA of fast settling or applications where PC board space is a
load current with good transient response. Load regula- premium. The test circuit shown in Figure 1 is used to
tion at 20mA output is typically 70ppm/mA meaning the measure the response time for various load currents and
output changes only 14mV.
load capacitors. The 1V step from 10V to 9V produces a
5
LT1460-10
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APPLICATIONS INFORMATION
current step of 1mA or 100µA for RL = 1k or RL = 10k.
Figure 2 shows the response of the reference with no load
capacitance.
Figure3showstheresponseofthereferencetoa1mAand
100µA load with a 0.01µF load capacitor.
Fast Turn-On
The reference settles to 10mV (0.1%) in 0.4µs for a 100µA
pulse and to 0.1% in 0.8µs with a 1mA step. When load
capacitanceisgreaterthan0.01µF, thereferencebeginsto
ring due to the pole formed with the output impedance.
It is recommended to add a 0.1µF or larger input capacitor
to the input pin of the LT1460-10. This helps stability with
largeloadcurrentsandspeedsupturn-on.TheLT1460-10
can start in 10µs, but it is important to limit the dv/dt of the
input. Under light load conditions and with a very fast
input, internal nodes overslew and this requires finite
recovery time. Figure 4 shows the result of no bypass
capacitance on the input and no output load. In this case
the supply dv/dt is 12.5V in 30ns which causes internal
overslew, and the output does not bias to 10V until 60µs.
A 0.1µF input capacitor guarantees the part always starts
quickly as shown in Figure 5.
R
L
V
OUT
V
= 12.5V
LT1460-10
IN
V
GEN
10V
9V
C
IN
C
L
0.1µF
1460-10 F01
Figure 1. Response Time Test Circuit
10V
9V
VGEN
12.5V
VIN
RL = 10k
0V
VOUT
VOUT
R
L = 1k
VOUT
0V
2µs/DIV
1460-10 F02
20µs/DIV
1460-10 F04
Figure 2. CL = 0
Figure 4. CIN = 0
10V
9V
VGEN
12.5V
0V
VIN
VOUT
R
L = 10k
VOUT
VOUT
RL = 1k
0V
10µs/DIV
1460-10 F03
20µs/DIV
1460-5 F04
Figure 5. CIN = 0.1µF
Figure 3. CL = 0.01µF
6
LT1460-10
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APPLICATIONS INFORMATION
Output Accuracy
forinstance)canshifttheoutputvoltageandmaskthetrue
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.
Like all references, either series or shunt, the error budget
of the LT1460-10 is made up of primarily three compo-
nents: initial accuracy, temperature coefficient and load
regulation.Lineregulationisneglectedbecauseittypically
contributesonly30ppm/V,or300µVfora1Vinputchange.
The LT1460-10 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:
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,
oraregionwheretheflexureoftheboardisminimum. 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.
LT1460AC
Initial accuracy = 0.075%
For IO = 100µA,
A qualitative technique to evaluate the effect of stress on
voltage references is to solder the part into a PC board and
deformtheboardafixedamountasshowninFigure6. 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.
This motion is repeated for a number of cycles and the
relative output deviation is noted. The result shown in
Figure 7a is for two LT1460S8-10s mounted vertically and
Figure 7b is for two LT1460S8-10s mounted horizontally.
The parts oriented in Figure 7a impart less stress into the
package because stress is absorbed in the leads. Figures
7a and 7b show the deviation to be between 500µV and
3500ppm
mA
which is 0.035%.
∆V
=
0.1mA 10V = 3.5mV
(
)(
)
OUT
For temperature 0°C to 70°C the maximum ∆T = 70°C,
10ppm
∆V
=
70°C 10V = 7mV
(
)(
)
OUT
°C
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.
1
2
3
PC Board Layout
4
In 13- to 16-bit systems where initial accuracy and tem-
perature coefficient calibrations have been done, the
mechanicalandthermalstressonaPCboard(inacardcage
1460-10 F06
Figure 6. Flexure Numbers
I
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
OUT
0
100µA
10mA
20mA
7
LT1460-10
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APPLICATIONS INFORMATION
1mV 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.
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 7a and
7b are shown in Figures 8a and 8b. In this example the
slots can improve the output shift from about 100ppm to
nearly zero.
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
8
4
8
4
LONG DIMENSION
0
LONG DIMENSION
0
–4
–4
0
40
10
20
30
0
40
10
20
30
1460-10 F07b
FLEXURE NUMBER
FLEXURE NUMBER
1460-10 F07a
Figure 7b. Two Typical LT1460S8-10s, Horizontal
Orientation Without Slots
Figure 7a. Two Typical LT1460S8-10s, Vertical
Orientation Without Slots
8
4
8
4
0
0
SLOT
SLOT
–4
–4
0
40
10
20
30
0
40
10
20
30
FLEXURE NUMBER
FLEXURE NUMBER
1460-10 F08a
1460-10 F08b
Figure 8a. Same Two LT1460S8-10s in Figure 7a,
but With Slots
Figure 8b. Same Two LT1460S8-10s in Figure 7b,
but With Slots
8
LT1460-10
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SI PLIFIED SCHE ATIC
V
CC
V
OUT
360k
48k
GND
1460-5 SS
9
LT1460-10
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PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.10)
8
7
6
5
0.040 ± 0.006
(1.02 ± 0.15)
0.006 ± 0.004
(0.15 ± 0.10)
0.007
(0.18)
0° – 6° TYP
0.118 ± 0.004**
(3.00 ± 0.10)
0.192 ± 0.004
(4.88 ± 0.10)
0.021 ± 0.004
(0.53 ± 0.01)
0.012
(0.30)
0.025
(0.65)
TYP
MSOP08 0595
1
2
3
4
*
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
4
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.125
0.005
(0.127)
MIN
0.015
(0.380)
MIN
(3.175)
MIN
0.325
2
3
–0.015
+0.635
8.255
N8 0695
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1460-10
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PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(LTC DWG # 05-08-1410)
0.060 ± 0.005
0.180 ± 0.005
(4.572 ± 0.127)
0.060 ± 0.010
(1.524 ± 0.254)
(1.524± 0.127)
DIA
0.90
(2.286)
NOM
0.140 ± 0.010
(3.556 ± 0.127)
0.180 ± 0.005
(4.572 ± 0.127)
5°
NOM
10° NOM
0.500
(12.70)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSION
0.016 ± 0.003
(0.406 ± 0.076)
Z3 (TO-92) 0695
0.015 ± 0.002
(0.381 ± 0.051)
0.050 ± 0.005
(1.270 ± 0.127)
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1460-10
U
TYPICAL APPLICATIONS
Boosted Output Current with No Current Limit
Boosted Output Current with Current Limit
+
+
V
≥ V
+ 2.8V
OUT
V
≥ (V
+ 1.8V)
OUT
+
+
D1*
LED
R1
220Ω
47µF
R1
220Ω
47µF
8.2Ω
2N2905
2N2905
IN
IN
10V
100mA
10V
100mA
LT1460-10 OUT
GND
LT1460-10 OUT
GND
+
+
2µF
SOLID
TANT
2µF
SOLID
TANT
*GLOWS IN CURRENT LIMIT,
DO NOT OMIT
1460-10 TA04
1460-10 TA03
Handling Higher Load Currents
12.5V
40mA
+
47µF
R1*
63Ω
IN
10mA
V
OUT
LT1460-10 OUT
GND
10V
TYPICAL LOAD
CURRENT = 50mA
R
L
*SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT.
LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN
PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL
BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS
DEGRADED IN THIS APPLICATION
1460-10 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1019
Precision Bandgap Reference
Precision Low Noise Reference
0.05% Max, 5ppm/°C Max
LT1236
0.05% Max, 5ppm/°C Max, SO Package
0.05%, Max, 25ppm/°C Max
LT1634
Micropower Precision Shunt Reference
146010f LT/TP 1097 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1997
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
12
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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