LT1460KCS3-3.3 [Linear]
Family of Micropower Series References in SOT-23; 家人在SOT- 23微系列参考文献型号: | LT1460KCS3-3.3 |
厂家: | Linear |
描述: | Family of Micropower Series References in SOT-23 |
文件: | 总12页 (文件大小:201K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1460S3 (SOT-23)
Family of Micropower
Series References
in SOT-23
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FEATURES
DESCRIPTIO
The LT®1460S3 is a family of SOT-23 micropower series
references that combine high accuracy and low drift with low
power dissipation and small package size. These series
references use curvature compensation to obtain low tem-
perature coefficient, and laser trimmed precision thin-film
resistors to achieve high output accuracy. Furthermore,
output shift due to PC board soldering stress has been
dramatically reduced. These references will supply up to
20mA, making them ideal for precision regulator applica-
tions, yet they are almost totally immune to input voltage
variations.
■
3-Lead SOT-23 Package
■
Low Drift: 20ppm/°C Max
■
■
■
■
■
■
■
■
High Accuracy: 0.2% Max
Low Supply Current
20mA Output Current Guaranteed
No Output Capacitor Required
Reverse-Battery Protection
Low PC Board Solder Stress: 0.02% Typ
Voltage Options: 2.5V, 3V, 3.3V, 5V and 10V
The LT1460 is Also Available in SO-8, 8-Lead MSOP,
8-Lead PDIP and TO-92 Packages.
Operating Temperature Range: –40°C to 85°C
■
These series references provide supply current and power
dissipationadvantagesovershuntreferencesthatmustidle
the entire load current to operate. Additionally, the
LT1460S3doesnotrequireanoutputcompensationcapaci-
tor.ThisfeatureisimportantinapplicationswherePCboard
space is a premium or fast settling is demanded. Reverse-
batteryprotectionkeepsthesereferencesfromconducting
reverse current.
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APPLICATIO S
■
Handheld Instruments
■
Precision Regulators
■
A/D and D/A Converters
Power Supplies
Hard Disk Drives
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Typical Distribution of SOT-23 LT1460HC
VOUT After IR Reflow Solder
32
Basic Connection
28
LT1460HC LIMITS
24
20
LT1460S3
GND
V
+ 0.9V ≤ V ≤ 20V
V
OUT
IN
OUT
OUT
IN
16
12
C1
0.1µF
1460S3 TA01
8
4
0
–0.2 –0.1
0.1
–0.3
0.2
0.3
0
OUTPUT VOLTAGE ERROR (%)
1460S3 TA02
1
LT1460S3 (SOT-23)
W W U W
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage ........................................................... 30V
Reverse Voltage.................................................... –15V
Output Short-Circuit Duration, TA = 25°C .............. 5 sec
Specified Temperature Range..................... 0°C to 70°C
Operating Temperature Range
(Note 2) ............................................. –40°C to 85°C
Storage Temperature Range (Note 3) ... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
S3
PART MARKING
LT1460HCS3-2.5
LT1460JCS3-2.5
LT1460KCS3-2.5
LT1460HCS3-3
LT1460JCS3-3
LT1460KCS3-3
LT1460HCS3-3.3
LT1460JCS3-3.3
LT1460KCS3-3.3
LT1460HCS3-5
LT1460JCS3-5
LT1460KCS3-5
LT1460HCS3-10
LT1460JCS3-10
LT1460KCS3-10
LTAC
LTAD
LTAE
LTAN
LTAP
LTAQ
LTAR
LTAS
LTAT
LTAK
LTAL
LTAM
LTAU
LTAV
LTAW
TOP VIEW
IN 1
3 GND
OUT 2
S3 PACKAGE
3-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 325°C/ W
Consult factory for Industrial and Military grade parts.
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AVAILABLE OPTIO S
OUTPUT VOLTAGE
SPECIFIED TEMPERATURE
ACCURACY
TEMPERATURE
COEFFICIENT (ppm/°C)
PART ORDER
NUMBER
(V)
RANGE
(%)
2.5
2.5
2.5
0°C to 70°C
0°C to 70°C
0°C to 70°C
0.2
0.4
0.5
20
20
50
LT1460HCS3-2.5
LT1460JCS3-2.5
LT1460KCS3-2.5
3
3
3
0°C to 70°C
0°C to 70°C
0°C to 70°C
0.2
0.4
0.5
20
20
50
LT1460HCS3-3
LT1460JCS3-3
LT1460KCS3-3
3.3
3.3
3.3
0°C to 70°C
0°C to 70°C
0°C to 70°C
0.2
0.4
0.5
20
20
50
LT1460HCS3-3.3
LT1460JCS3-3.3
LT1460KCS3-3.3
5
5
5
0°C to 70°C
0°C to 70°C
0°C to 70°C
0.2
0.4
0.5
20
20
50
LT1460HCS3-5
LT1460JCS3-5
LT1460KCS3-5
10
10
10
0°C to 70°C
0°C to 70°C
0°C to 70°C
0.2
0.4
0.5
20
20
50
LT1460HCS3-10
LT1460JCS3-10
LT1460KCS3-10
2
LT1460S3 (SOT-23)
The ● denotes specifications which apply over the full specified
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER
CONDITIONS
LT1460HCS3
LT1460JCS3
LT1460KCS3
MIN
–0.2
–0.4
–0.5
TYP
MAX
0.2
UNITS
%
Output Voltage Tolerance (Note 4)
0.4
%
0.5
%
Output Voltage Temperature Coefficient (Note 5)
Line Regulation
LT1460HCS3
LT1460JCS3
LT1460KCS3
●
●
●
10
10
25
20
20
50
ppm/°C
ppm/°C
ppm/°C
V
+ 0.9V ≤ V ≤ V + 2.5V
OUT
150
800
1000
ppm/V
ppm/V
OUT
OUT
OUT
OUT
OUT
IN
●
●
●
●
●
V
+ 2.5V ≤ V ≤ 20V
50
100
130
ppm/V
ppm/V
IN
Load Regulation Sourcing (Note 6)
I
I
I
= 100µA
= 10mA
= 20mA
1000
50
3000
4000
ppm/mA
ppm/mA
200
300
ppm/mA
ppm/mA
20
70
100
ppm/mA
ppm/mA
Thermal Regulation (Note 7)
Dropout Voltage (Note 8)
∆P = 200mW
2.5
10
ppm/mW
V
V
V
– V , ∆V
≤ 0.2%, I
= 0
●
●
0.9
IN
IN
OUT
OUT
OUT
OUT
– V , ∆V
≤ 0.2%, I
= 10mA
1.3
1.4
V
V
OUT
OUT
Output Current
Short V
to GND
40
mA
OUT
Reverse Leakage
V
= –15V
●
0.5
10
µA
IN
Output Voltage Noise (Note 9)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
4
4
ppm (P-P)
ppm (RMS)
Long-Term Stability of Output Voltage (Note 10)
Hysteresis (Note 11)
100
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
50
250
ppm
ppm
Supply Current
LT1460S3-2.5
115
145
145
160
215
145
175
µA
µA
●
●
●
●
●
LT1460S3-3
LT1460S3-3.3
LT1460S3-5
LT1460S3-10
180
220
µA
µA
180
220
µA
µA
200
240
µA
µA
270
350
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1460S3 is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 4: ESD (Electrostatic Discharge) sensitive devices. Extensive use of
ESD protection devices are used internal to the LT1460S3, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 5: 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 3: If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
3
LT1460S3 (SOT-23)
ELECTRICAL CHARACTERISTICS
Note 6: 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 7: 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 10: 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. Long-term stability will also be affected by
differential stresses between the IC and the board material created during
board assembly.
Note 8: Excludes load regulation errors.
Note 11: 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 70°C or 0°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. See
Applications Information.
Note 9: Peak-to-peak noise is measured with a single pole highpass filter
at 0.1Hz and 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 pole 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.
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Characteristic curves are similar for most
TYPICAL PERFORMANCE CHARACTERISTICS
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for
other output voltages fall between these curves, and can be estimated based on their voltage output.
2.5V Minimum Input-Output
Voltage Differential
2.5V Load Regulation, Sourcing
2.5V Load Regulation, Sinking
100
10
1
120
100
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
125°C
–55°C
80
60
25°C
125°C
–55°C
25°C
25°C
–55°C
40
20
0
125°C
0.1
0
0.5
1.0
1.5
2.0
2.5
0
1
2
3
4
5
0.1
1
10
100
INPUT-OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460s3 G02
1460S3 G03
1460S3 G01
4
LT1460S3 (SOT-23)
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Characteristic curves are similar for most
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for
other output voltages fall between these curves, and can be estimated based on their voltage output.
TYPICAL PERFORMANCE CHARACTERISTICS
2.5V Output Voltage
Temperature Drift
2.5V Supply Current
vs Input Voltage
2.5V Line Regulation
2.502
2.501
2.500
2.499
2.498
2.497
2.496
2.495
2.494
2.503
2.502
2.501
2.500
250
200
150
100
50
THREE TYPICAL PARTS
25°C
125°C
25°C
–55°C
–55°C
125°C
2.499
2.498
2.497
0
50
TEMPERATURE (°C)
100 125
5
10
INPUT VOLTAGE (V)
15
–50 –25
0
25
75
0
0
2
4
6
8
10 12 14 16 18 20
20
INPUT VOLTAGE (V)
1460S3 G04
1460S3 G05
1460S3 G06
2.5V Power Supply Rejection
Ratio vs Frequency
2.5V Output Impedance
vs Frequency
2.5V Transient Response
80
70
60
50
40
30
20
10
0
1000
100
10
C
= 0µF
L
20
10
1
C
= 0.1µF
L
C
= 1µF
L
0.1
1
1460S3 G09
200µs/DIV
CLOAD = 0µF
0.1
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1460S3 G07
1460S3 G08
2.5V Output Voltage
Noise Spectrum
2.5V Output Noise 0.1Hz to 10Hz
1000
100
TIME (2 SEC/DIV)
10
100
1k
10k
100k
FREQUENCY (Hz)
1460-2.5 G10
1460S3 G11
5
LT1460S3 (SOT-23)
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Characteristic curves are similar for most
TYPICAL PERFORMANCE CHARACTERISTICS
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for
other output voltages fall between these curves, and can be estimated based on their voltage output.
10V Minimum Input-Output
Voltage Differential
10V Load Regulation, Sourcing
10V Load Regulation, Sinking
100
10
1
35
30
25
20
15
10
5
250
200
150
100
50
125°C
125°C
25°C
25°C
–55°C
–55°C
–55°C
0
–5
–10
125°C
25°C
0.1
0
0
0.5
1.0
1.5
2.0
2.5
0.1
1
10
100
0
1
2
3
4
5
INPUT-OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1460S3 G13
1460S3 G12
1460S3 G14
10V Output Voltage
Temperature Drift
10V Supply Current
vs Input Voltage
10V Line Regulation
10.006
10.004
10.002
10.000
9.998
9.996
9.994
9.992
9.990
9.988
9.986
9.984
9.982
10.010
10.005
10.000
9.995
350
300
THREE TYPICAL PARTS
25°C
125°C
250
25°C
–55°C
125°C
–55°C
200
150
100
50
9.990
9.985
9.980
0
–50
0
25
50
75 100 125
–25
0
6
10 12 14 16 18 20
6
8
10
12
14
16
18
20
2
4
8
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1460S3 G15
1460S3 G16
1560S3 G17
10V Power Supply Rejection
Ratio vs Frequency
10V Output Impedance
vs Frequency
10V Transient Response
100
90
80
70
60
50
40
30
20
10
0
1000
100
10
20
10
C
= 0µF
L
C
= 0.1µF
L
1
C
= 1µF
L
0.1
1
1460S3 G20
200µs/DIV
CLOAD = 0µF
0.1
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
1460S3 G18
1460S3 G19
6
LT1460S3 (SOT-23)
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Characteristic curves are similar for most
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for
other output voltages fall between these curves, and can be estimated based on their voltage output.
TYPICAL PERFORMANCE CHARACTERISTICS
10V Output Voltage
Noise Spectrum
10V Output Noise 0.1Hz to 10Hz
10
1
0.1
0.01
0.1
1
10
100
TIME (2 SEC/DIV)
FREQUENCY (kHz)
1460S3 G10
1460S3 G22
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APPLICATIONS INFORMATION
capacitive load, these references are 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 and stability of various load currents and
load capacitors. This circuit is set for the 2.5V option. For
other voltage options, the input voltage must be scaled up
and the output voltage generator offset voltage must be
adjusted. The 1V step from 2.5V to 1.5V produces a
current step of 10mA or 1mA for RL = 100Ω or RL = 1k.
Figure2showstheresponseofthereferencetothese1mA
and 10mA load steps with no load capacitance, and Figure
3 shows a 1mA and 10mA load step with a 0.1µF output
capacitor. Figure 4 shows the response to a 1mA load step
with CL = 1µF and 4.7µF.
Longer Battery Life
Series references have a large advantage over older shunt
style references. Shunt references require a resistor from
the power supply to operate. This resistor must be chosen
to supply the maximum current that can ever be
demanded by the circuit being regulated. When the circuit
beingcontrolledisnotoperatingatthismaximumcurrent,
the shunt reference must always sink this current, result-
ing in high dissipation and short battery life.
The LT1460S3 series references do not require a current
setting resistor and can operate with any supply voltage
from VOUT + 0.9V to 20V. When the circuitry being regu-
lated does not demand current, the LT1460S3s reduce
their dissipation and battery life is extended. If the refer-
ences are not delivering load current, they dissipate only
several mW, yet the same connection can deliver 20mA of
load current when demanded.
R
L
V
OUT
V
= 2.5V
LT1460S3-2.5
IN
V
GEN
2.5V
1.5V
C
IN
C
L
0.1µF
Capacitive Loads
1460S3 F01
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
Figure 1. Response Time Test Circuit
7
LT1460S3 (SOT-23)
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APPLICATIONS INFORMATION
Table1givesthemaximumoutputcapacitanceforvarious
loadcurrentsandoutputvoltagestoavoidinstability.Load
capacitorswithlowESR(effectiveseriesresistance)cause
more ringing than capacitors with higher ESR such as
polarized aluminum or tantalum capacitors.
2.5V
1.5V
VGEN
VOUT
1mA
Table 1. Maximum Output Capacitance
VOLTAGE
VOUT
10mA
OPTION
2.5V
3V
I
= 100µA
I
= 1mA
I
= 10mA
2µF
I
= 20mA
OUT
OUT
OUT
OUT
>10µF
>10µF
>10µF
>10µF
>10µF
>10µF
0.68µF
1460S3 F02
1µs/DIV
>10µF
>10µF
>10µF
1µF
2µF
0.68µF
0.68µF
0.68µF
0.1µF
Figure 2. CL = 0µF
3.3V
5V
1µF
1µF
10V
0.15µF
VGEN
2.5V
1.5V
Long-Term Drift
Long-term drift cannot be extrapolated from acceler-
ated high temperature testing. This erroneous tech-
niquegivesdriftnumbersthatarewidelyoptimistic.The
only way long-term drift can be determined is to mea-
sure it over the time interval of interest. The LT1460S3
long-term drift data was taken on over 100 parts that were
soldered into PC boards similar to a “real world” applica-
tion.Theboardswerethenplacedintoaconstanttempera-
ture oven with TA = 30°C, their outputs were scanned
regularly and measured with an 8.5 digit DVM. Figure 5
shows typical long-term drift of the LT1460S3s.
VOUT
1mA
10mA
VOUT
1460S3-5 F03
100µs/DIV
Figure 3. CL = 0.1µF
VGEN
2.5V
1.5V
150
100
VOUT
1µF
50
0
VOUT
4.7µF
–50
–100
–150
1460S3 F04
100µs/DIV
Figure 4. IOUT = 1mA
0
100 200 300 400 500 600 700 800 900 1000
HOURS
1460S3 F05
Figure 5. Typical Long-Term Drift
8
LT1460S3 (SOT-23)
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APPLICATIONS INFORMATION
Hysteresis
Fast Turn-On
HysteresisdatashowninFigure5andFigure6represents
the worst-case data taken on parts from 0°C to 70°C and
from –40°C to 85°C. The output is capable of dissipating
relatively high power, i.e., for the LT1460S3-2.5, PD =
17.5V • 20mA = 350mW. The thermal resistance of the
SOT-23 package is 325°C/W and this dissipation causes
a 114°C internal rise producing a junction temperature of
TJ =25°C+114°C=139°C.Thiselevatedtemperaturewill
cause the output to shift due to thermal hysteresis. For
highest performance in precision applications, do not
let the LT1460S3’s junction temperature exceed 85°C.
It is recommended to add a 0.1µF or larger bypass
capacitor to the input pin of the LT1460S3s. Although this
can help stability with large load currents, another reason
is for proper start-up. The LT1460S3 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 8
showstheresultofnobypasscapacitanceontheinputand
no output load on the LT1460S3-5. 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 40µs after turn-on.
Although 40µs is a typical turn-on time, it can be much
longer. Figure 9 shows the effect of a 0.1µF bypass
capacitor which limits the input dv/dt to approximately
7.5V in 20µs. The part always starts quickly.
18
WORST-CASE HYSTERESIS
ON 40 UNITS
16
14
12
10
8
70°C TO 25°C
0°C TO 25°C
7.5V
6
VIN
4
0V
2
0
160 200 240
–240 –200 –160 –120 –80 –40
0
40 80 120
VOUT
HYSTERESIS (ppm)
1460S3 F06
0V
Figure 6. 0°C to 70°C Hysteresis
1460S3 F08
20µs/DIV
Figure 8. CIN = 0µF
9
8
7
6
5
4
3
2
1
0
WORST-CASE HYSTERESIS
ON 34 UNITS
85°C TO 25°C
–40°C TO 25°C
7.5V
VIN
0V
VOUT
400 500 600
100 200 300
–600 –500 –400 –300 –200 –100
0
HYSTERESIS (ppm)
1460S3 F07
1460S3 F08
20µs/DIV
Figure 9. CIN = 0.1µF
Figure 7. –40°C to 85°C Hysteresis
9
LT1460S3 (SOT-23)
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APPLICATIONS INFORMATION
Output Accuracy
Total worst-case output error is:
0.2% + 0.04% + 0.14% = 0.380%
Like all references, either series or shunt, the error budget
of the LT1460S3s is made up of primarily three compo-
nents: initial accuracy, temperature coefficient and load
regulation.Lineregulationisneglectedbecauseittypically
contributes only 150ppm/V. The LT1460S3s typically
shift 0.02% when soldered into a PCB, so this is also
neglected. The output errors are calculated as follows for
a 100µA load and 0°C to 70°C temperature range:
Table 2 gives the worst-case accuracy for LT1460HCS3,
LT1460JCS3 and LT1460KCS3 from 0°C to 70°C, and
shows that if the LT1460HCS3 is used as a reference
instead of a regulator, it is capable of 8 bits of absolute
accuracy over temperature without a system calibration.
Table 2. Worst-Case Output Accuracy over Temperature
I
LT1460HCS3
0.340%
LT1460JCS3
0.540%
LT1460KCS3
0.850%
0.890%
1.15%
OUT
LT1460HCS3
Initial Accuracy = 0.2%
0µA
100µA
10mA
20mA
0.380%
0.580%
0.640%
0.840%
For IOUT = 100µA
0.540%
0.740%
1.05%
∆VOUT = (4000ppm/mA)(0.1mA) = 0.04%
For Temperature 0°C to 70°C the maximum ∆T = 70°C
∆VOUT = (20ppm/°C)(70°C) = 0.14%
10
LT1460S3 (SOT-23)
U
PACKAGE DESCRIPTION
Dimensions in millimeters (inches) unless otherwise noted.
S3 Package
3-Lead Plastic SOT-23
(LTC DWG # 05-08-1631)
2.80 – 3.04
(0.110 – 0.120)
0.95
0.037
BSC
0.45 – 0.60
(0.017 – 0.024)
1.92
2.10 – 2.64
0.075
BSC
(0.083 – 0.104)
1.20 – 1.40
(0.047 – 0.060)
0.013 – 0.10
(0.0005 – 0.004)
0.89 – 1.12
(0.035 – 0.044)
0.55
(0.022)
REF
0.37 – 0.51
(0.015 – 0.020)
0.09 – 0.18
(0.004 – 0.007)
SOT-23 0599
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. JEDEC REFERENCE IS TO-236 VARIATION AB
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
LT1460S3 (SOT-23)
U
TYPICAL APPLICATIONS
Handling Higher Load Currents
+
V
40mA
+
47µF
IN
R1*
LT1460S3
10mA
V
OUT
OUT
GND
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
+
V
– V
OUT
R1 =
40mA
1460S3 TA05
Boosted Output Current with No Current Limit
Boosted Output Current with Current Limit
+
+
V
≥ (V
+ 1.8V)
OUT
V
≥ V
+ 2.8V
OUT
+
+
D1*
LED
R1
220Ω
R1
220Ω
47µF
47µF
8.2Ω
2N2905
2N2905
IN
LT1460S3
OUT
IN
LT1460S3
OUT
V
OUT
V
OUT
100mA
100mA
+
2µF
SOLID
TANT
GND
+
2µF
GND
SOLID
TANT
GLOWS IN CURRENT LIMIT,
DO NOT OMIT
*
1460S3 TA04
1460S3 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1019
Precision Bandgap Reference
Precision 5V Reference
0.05% Max, 5ppm/°C Max
0.02%, 2ppm/°C Max
LT1027
LT1236
Precision Low Noise Reference
0.05% Max, 5ppm/°C Max, SO Package
LT1461
Micropower Precision Low Dropout
0.04% Max, 3ppm/°C Max, 50mA Output Current
0.05%, 25ppm/°C Max
LT1634
Micropower Precision Shunt Reference 1.25V, 2.5V Output
Micropower Low Dropout Reference, Fixed or Adjustable
LTC1798
0.15% Max, 40ppm/°C, 6.5µA Max Supply Current
1460s3f LT/TP 0999 4K • PRINTED IN USA
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
LINEAR TECHNOLOGY CORPORATION 1997
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