LINER LT1460EIS8-10 Micropower precision series reference Datasheet

LT1460-10
Micropower Precision
Series Reference
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DESCRIPTION
FEATURES
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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
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APPLICATIONS
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Handheld Instruments
Precision Regulators
A/D and D/A Converters
Power Supplies
Hard Disk Drives
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
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 LT1460-10
does not require an output capacitor, but it is stable with
capacitive loads. 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 LT1460-10 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
18
Basic Connection
16
14
IN
C1
0.1µF
OUT
10V
GND
1460-10 TA01
UNITS (%)
LT1460-10
10.9V
TO 20V
1400 PARTS
FROM 2 RUNS
12
10
8
6
4
2
0
– 0.10
– 0.06 – 0.02 0 0.02
0.06
OUTPUT VOLTAGE ERROR (%)
0.10
1460-10 TA02
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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
Commercial ............................................ 0°C to 70°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range (Note 1) ... – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
NC*
VIN
NC*
GND
8
7
6
5
1
2
3
4
NC*
NC*
VOUT
NC*
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
8
NC*
VIN 2
7
NC*
NC* 3
6
VOUT
GND 4
5
NC*
N8 PACKAGE
8-LEAD PDIP
*CONNECTED INTERNALLY.
DO NOT CONNECT
EXTERNAL CIRCUITRY
TO THESE PINS
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART NUMBER
ORDER PART NUMBER
LT1460ACN8-10
LT1460BIN8-10
LT1460DCN8-10
LT1460EIN8-10
MS8 PART MARKING
3
2
1
VIN
VOUT
GND
Z PACKAGE
3-LEAD TO-92 PLASTIC
TJMAX = 150°C, θJA = 160°C/ W
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
TJMAX = 150°C, θJA = 250°C/ W
LT1460CCMS8-10
LT1460FCMS8-10
BOTTOM VIEW
NC* 1
ORDER PART NUMBER
LT1460ACS8-10
LT1460BIS8-10
LT1460DCS8-10
LT1460EIS8-10
LT1460GCZ-10
LT1460GIZ-10
S8 PART MARKING
LTAH
LTAJ
1460A1
460BI1
1460D1
460EI1
Consult factory for Military grade parts.
Available Options
ACCURACY
(%)
TEMPERATURE
COEFFICIENT
(ppm/°C)
N8
S8
0°C to 70°C
0.075
10
LT1460ACN8-10
LT1460ACS8-10
– 40°C to 85°C
0.10
10
LT1460BIN8-10
LT1460BIS8-10
0°C to 70°C
0.10
15
0°C to 70°C
0.10
20
LT1460DCN8-10
LT1460DCS8-10
– 40°C to 85°C
0.125
20
LT1460EIN8-10
LT1460EIS8-10
0°C to 70°C
0.15
25
0°C to 70°C
0.25
25
LT1460GCZ-10
– 40°C to 85°C
0.25
25
LT1460GIZ-10
TEMPERATURE
2
PACKAGE TYPE
MS8
Z
LT1460CCMS8-10
LT1460FCMS8-10
LT1460-10
ELECTRICAL CHARACTERISTICS
VIN = 12.5V, IOUT = 0, TA = 25°C unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
Output Voltage (Note 2)
LT1460ACN8, ACS8
9.9925
– 0.075
10.000
10.0075
0.075
V
%
LT1460BIN8, BIS8, CCMS8, DCN8, DCS8
9.990
– 0.10
10.000
10.010
0.10
V
%
LT1460EIN8, EIS8
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
%
5
7
10
12
10
15
20
25
ppm/°C
ppm/°C
ppm/°C
ppm/°C
30
60
80
ppm/V
ppm/V
10
25
35
ppm/V
ppm/V
1500
2800
3500
ppm/mA
ppm/mA
80
135
180
ppm/mA
ppm/mA
70
100
140
ppm/mA
ppm/mA
0.5
2.5
ppm/mW
Output Voltage Temperature Coefficient (Note 3)
Line Regulation
TMIN ≤ TJ ≤ TMAX
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
●
●
●
●
10.9V ≤ VIN ≤ 12.5V
●
12.5V ≤ VIN ≤ 20V
●
Load Regulation Sourcing (Note 4)
IOUT = 100µA
●
IOUT = 10mA
●
IOUT = 20mA
0°C to 70°C
Thermal Regulation (Note 5)
Dropout Voltage (Note 6)
●
∆P = 200mW
VIN – VOUT, ∆VOUT ≤ 0.1%, IOUT = 0
●
0.9
V
●
1.3
1.4
V
V
VIN – VOUT, ∆VOUT ≤ 0.1%, IOUT = 10mA
Output Current
Short VOUT to GND
Reverse Leakage
VIN = – 15V
40
●
Supply Current
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
Long-Term Stability of Output Voltage, S8 Pkg (Note 8)
Hysteresis (Note 9)
∆T = – 40°C to 85°C
∆T = 0°C to 70°C
The ● denotes specifications which apply over the specified temperature
range.
Note 1: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
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.
mA
0.5
10
µA
190
270
360
µA
µA
●
Output Voltage Noise (Note 7)
UNITS
40
35
µVP-P
µVRMS
40
ppm/√kHr
160
25
ppm
ppm
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 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.
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LT1460-10
ELECTRICAL CHARACTERISTICS
Note 6: Excludes load regulation errors.
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
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.
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TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input/Output
Voltage Differential
Load Regulation, Sourcing
10
125°C
1
– 55°C
25°C
100
9
90
8
7
6
125°C
5
0
0.5
1.0
1.5
2.0
INPUT/OUTPUT VOLTAGE (V)
3
2
– 55°C
0
0.1
2.5
80
70
25°C
60
– 55°C
50
125°C
40
30
20
10
0
1
10
OUTPUT CURRENT (mA)
100
1
0
3
4
2
OUTPUT CURRENT (mA)
1460-10 G02
1460-10 G01
Output Voltage Temperature Drift
10.006
25°C
4
1
0.1
Load Regulation, Sinking
10
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
100
1460-10 G03
Supply Current vs Input Voltage
Line Regulation
10.004
400
3 TYPICAL PARTS
5
360
9.998
9.994
9.990
– 55°C
280
240
25°C
200
125°C
160
120
80
9.986
OUTPUT VOLTAGE (V)
10.000
320
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
10.002
25°C
9.996
– 55°C
9.992
125°C
9.988
9.984
40
9.982
– 50
–25
0
25
50
TEMPERATURE (°C)
75
100
1460-10 G04
4
0
9.980
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460-10 G05
6
8
14
16
10
12
INPUT VOLTAGE (V)
18
20
1460-10 G06
LT1460-10
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TYPICAL PERFORMANCE CHARACTERISTICS
Power Supply Rejection Ratio
vs Frequency
1000
10
CL = 0µF
80
70
60
50
40
30
20
100
CL = 0.1µF
10
CL = 1µF
1
0.1
0
1
IOUT = 10mA
10
0
0.1
LOAD CAPACITANCE (µF)
90
OUTPUT IMPEDANCE (Ω)
POWER SUPPLY REJECTION RATIO (dB)
Transient Responses
Output Impedance vs Frequency
100
1
10
100
INPUT FREQUENCY (kHz)
1000
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1460-10 G07
200µs/DIV
1460-10 G09
1000
1460-10 G08
Output Voltage Noise Spectrum
Output Noise 0.1Hz to 10Hz
OUTPUT NOISE (50µV/DIV)
NOISE VOLTAGE (µV/√Hz)
10
1
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
0
2
4
1460-10 G10
6
8
10
TIME (SEC)
12
14
1460-10 G11
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APPLICATIONS INFORMATION
Precision Regulator
Capacitive Loads
The LT1460-10 is ideal as a precision regulator, and since
it operates in series mode it does not require a current
setting resistor. The reference can supply up to 20mA of
load current with good transient response. Load regulation at 20mA output is typically 70ppm/mA meaning the
output changes only 14mV.
The LT1460-10 is designed to be stable with capacitive
loads. With no capacitive load, the reference is ideal for
fast settling or applications where PC board space is a
premium. The test circuit shown in Figure 1 is used to
measure the response time for various load currents and
load capacitors. The 1V step from 10V to 9V produces a
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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.
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
capacitance is greater than 0.01µF, the reference begins to
ring due to the pole formed with the output impedance.
VIN = 12.5V
LT1460-10
RL
VOUT
VGEN
CIN
0.1µF
10V
9V
CL
1460-10 F01
Figure 1. Response Time Test Circuit
Figure 3 shows the response of the reference to a 1mA and
100µA load with a 0.01µF load capacitor.
Fast Turn-On
It is recommended to add a 0.1µF or larger input capacitor
to the input pin of the LT1460-10. This helps stability with
large load currents and speeds up turn-on. The LT1460-10
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.
10V
VGEN
12.5V
9V
VIN
VOUT
RL = 10k
VOUT
RL = 1k
0V
VOUT
0V
2µs/DIV
20µs/DIV
1460-10 F02
Figure 2. CL = 0
1460-10 F04
Figure 4. CIN = 0
10V
VGEN
12.5V
9V
VOUT
RL = 10k
VOUT
RL = 1k
VIN
0V
VOUT
0V
10µs/DIV
Figure 3. CL = 0.01µF
6
1460-10 F03
20µs/DIV
Figure 5. CIN = 0.1µF
1460-5 F04
LT1460-10
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APPLICATIONS INFORMATION
Output Accuracy
Like all references, either series or shunt, the error budget
of the LT1460-10 is made up of primarily three components: initial accuracy, temperature coefficient and load
regulation. Line regulation is neglected because it typically
contributes only 30ppm/V, or 300µV for a 1V input change.
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:
LT1460AC
Initial accuracy = 0.075%
For IO = 100µA,
 3500ppm 
∆VOUT = 
 0.1mA 10V = 3.5mV
 mA 
(
)( )
which is 0.035%.
For temperature 0°C to 70°C the maximum ∆T = 70°C,
 10ppm 
∆VOUT = 
 70°C 10 V = 7mV
 °C 
(
)( )
which is 0.07%.
Total worst-case output error is:
0.075% + 0.035% + 0.070% = 0.180%.
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 displacement 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
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 temperature coefficient calibrations have been done, the
mechanical and thermal stress on a PC board (in a cardcage
IOUT
1460-10 F06
Figure 6. Flexure Numbers
LT1460AC
LT1460BI
LT1460CC
LT1460DC
LT1460EI
LT1460FC
LT1460GC
LT1460GI
0
0.145%
0.225%
0.205%
0.240%
0.375%
0.325%
0.425%
0.562%
100µA
0.180%
0.260%
0.240%
0.275%
0.410%
0.360%
0.460%
0.597%
10mA
0.325%
0.405%
0.385%
0.420%
0.555%
0.505%
0.605%
0.742%
20mA
0.425%
N/A
0.485%
0.520%
N/A
0.605%
0.705%
N/A
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LT1460-10
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APPLICATIONS INFORMATION
1mV and implies a 50ppm and 100ppm change respectively. 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 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.
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OUTPUT DEVIATION (mV)
OUTPUT DEVIATION (mV)
8
4
LONG DIMENSION
0
4
LONG DIMENSION
0
–4
–4
0
10
20
30
0
40
30
40
1460-10 F07b
Figure 7b. Two Typical LT1460S8-10s, Horizontal
Orientation Without Slots
8
8
OUTPUT DEVIATION (mV)
OUTPUT DEVIATION (mV)
20
1460-10 F07a
Figure 7a. Two Typical LT1460S8-10s, Vertical
Orientation Without Slots
4
0
SLOT
–4
4
0
SLOT
–4
0
10
20
30
FLEXURE NUMBER
Figure 8a. Same Two LT1460S8-10s in Figure 7a,
but With Slots
8
10
FLEXURE NUMBER
FLEXURE NUMBER
40
1460-10 F08a
0
10
20
30
FLEXURE NUMBER
Figure 8b. Same Two LT1460S8-10s in Figure 7b,
but With Slots
40
1460-10 F08b
LT1460-10
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SI PLIFIED SCHE ATIC
VCC
VOUT
360k
48k
GND
1460-5 SS
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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)
0.040 ± 0.006
(1.02 ± 0.15)
0.007
(0.18)
0.118 ± 0.004*
(3.00 ± 0.10)
0.006 ± 0.004
(0.15 ± 0.10)
8
7 6
5
0° – 6° TYP
0.021 ± 0.004
(0.53 ± 0.01)
0.118 ± 0.004**
(3.00 ± 0.10)
0.192 ± 0.004
(4.88 ± 0.10)
0.012
(0.30)
0.025
(0.65)
TYP
1
* 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
4
2 3
MSOP08 0595
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.025
0.325 –0.015
+0.635
8.255
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
0.005
(0.127)
MIN
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.125
(3.175)
MIN
0.018 ± 0.003
0.100 ± 0.010
(0.457 ± 0.076)
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
0.400*
(10.160)
MAX
0.015
(0.380)
MIN
N8 0695
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
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
7
8
0.004 – 0.010
(0.101 – 0.254)
6
5
0°– 8° TYP
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
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
SO8 0695
1
2
3
4
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(LTC DWG # 05-08-1410)
0.060 ± 0.005
(1.524± 0.127)
DIA
0.180 ± 0.005
(4.572 ± 0.127)
0.500
(12.70)
MIN
0.050 ± 0.005
(1.270 ± 0.127)
0.180 ± 0.005
(4.572 ± 0.127)
0.060 ± 0.010
(1.524 ± 0.254)
0.90
(2.286)
NOM
0.050 UNCONTROLLED
(1.270) LEAD DIMENSION
MAX
0.016 ± 0.003
(0.406 ± 0.076)
0.140 ± 0.010
(3.556 ± 0.127)
5°
NOM
10° NOM
0.015 ± 0.002
(0.381 ± 0.051)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Z3 (TO-92) 0695
11
LT1460-10
U
TYPICAL APPLICATIONS
Boosted Output Current with No Current Limit
V + ≥ (VOUT + 1.8V)
Boosted Output Current with Current Limit
V+ ≥ VOUT + 2.8V
+
R1
220Ω
D1*
LED
47µF
+
R1
220Ω
8.2Ω
2N2905
2N2905
IN
IN
10V
100mA
LT1460-10 OUT
GND
47µF
+
10V
100mA
LT1460-10 OUT
2µF
SOLID
TANT
+
GND
*GLOWS IN CURRENT LIMIT,
DO NOT OMIT
1460-10 TA03
2µF
SOLID
TANT
1460-10 TA04
Handling Higher Load Currents
12.5V
40mA
+
47µF
IN
10mA
R1*
63Ω
VOUT
10V
LT1460-10 OUT
GND
RL
TYPICAL LOAD
CURRENT = 50mA
*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
0.05% Max, 5ppm/°C Max
LT1236
Precision Low Noise Reference
0.05% Max, 5ppm/°C Max, SO Package
LT1634
Micropower Precision Shunt Reference
0.05%, Max, 25ppm/°C Max
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900
FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com
146010f LT/TP 1097 4K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1997
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