LINER LT1460HCS3-3.3 Family of micropower series references in sot-23 Datasheet

LT1460S3 (SOT-23)
Family of Micropower
Series References
in SOT-23
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FEATURES
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DESCRIPTIO
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
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APPLICATIO S
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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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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 temperature 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 applications, yet they are almost totally immune to input voltage
variations.
These series references provide supply current and power
dissipation advantages over shunt references that must idle
the entire load current to operate. Additionally, the
LT1460S3 does not require an output compensation capacitor. This feature is important in applications where PC board
space is a premium or fast settling is demanded. Reversebattery protection keeps these references from conducting
reverse current.
TYPICAL APPLICATIO
Typical Distribution of SOT-23 LT1460HC
VOUT After IR Reflow Solder
32
Basic Connection
28
LT1460HC LIMITS
LT1460S3
VOUT + 0.9V ≤ VIN ≤ 20V
IN
C1
0.1µF
OUT
VOUT
GND
1460S3 TA01
DISTRIBUTION (%)
24
20
16
12
8
4
0
– 0.3
– 0.2
– 0.1
0.1
0.2
0
OUTPUT VOLTAGE ERROR (%)
0.3
1460S3 TA02
1
LT1460S3 (SOT-23)
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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
TOP VIEW
IN 1
3 GND
OUT 2
S3 PACKAGE
3-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 325°C/ W
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
Consult factory for Industrial and Military grade parts.
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AVAILABLE OPTIO S
OUTPUT VOLTAGE
(V)
2.5
2.5
2.5
3
3
3
3.3
3.3
3.3
5
5
5
10
10
10
2
SPECIFIED TEMPERATURE
RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
ACCURACY
(%)
0.2
0.4
0.5
0.2
0.4
0.5
0.2
0.4
0.5
0.2
0.4
0.5
0.2
0.4
0.5
TEMPERATURE
COEFFICIENT (ppm/°C)
20
20
50
20
20
50
20
20
50
20
20
50
20
20
50
PART ORDER
NUMBER
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
LT1460S3 (SOT-23)
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER
CONDITIONS
MIN
Output Voltage Tolerance (Note 4)
LT1460HCS3
MAX
UNITS
– 0.2
0.2
%
LT1460JCS3
– 0.4
0.4
%
LT1460KCS3
– 0.5
0.5
%
10
10
25
20
20
50
ppm/°C
ppm/°C
ppm/°C
150
800
1000
ppm/V
ppm/V
50
100
130
ppm/V
ppm/V
1000
3000
4000
ppm/mA
ppm/mA
50
200
300
ppm/mA
ppm/mA
20
70
100
ppm/mA
ppm/mA
2.5
10
ppm/mW
●
0.9
V
●
1.3
1.4
V
V
Output Voltage Temperature Coefficient (Note 5)
LT1460HCS3
LT1460JCS3
LT1460KCS3
Line Regulation
VOUT + 0.9V ≤ VIN ≤ VOUT + 2.5V
●
●
●
TYP
●
VOUT + 2.5V ≤ VIN ≤ 20V
●
Load Regulation Sourcing (Note 6)
IOUT = 100µA
●
IOUT = 10mA
●
IOUT = 20mA
●
Thermal Regulation (Note 7)
Dropout Voltage (Note 8)
∆P = 200mW
VIN – VOUT, ∆VOUT ≤ 0.2%, IOUT = 0
VIN – VOUT, ∆VOUT ≤ 0.2%, IOUT = 10mA
Output Current
Short VOUT to GND
Reverse Leakage
VIN = – 15V
Output Voltage Noise (Note 9)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
40
●
Long-Term Stability of Output Voltage (Note 10)
Hysteresis (Note 11)
∆T = 0°C to 70°C
∆T = –40°C to 85°C
Supply Current
LT1460S3-2.5
●
●
0.5
ppm (P-P)
ppm (RMS)
100
ppm/√kHr
50
250
ppm
ppm
115
145
175
µA
µA
145
180
220
µA
µA
145
180
220
µA
µA
160
200
240
µA
µA
215
270
350
µA
µA
●
LT1460S3-3.3
●
LT1460S3-5
●
LT1460S3-10
●
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 3: If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
µA
4
4
●
LT1460S3-3
mA
10
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.
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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 8: Excludes load regulation errors.
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.
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 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.
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TYPICAL PERFORMANCE CHARACTERISTICS
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.
2.5V Minimum Input-Output
Voltage Differential
2.5V Load Regulation, Sourcing
25°C
– 55°C
1
0.1
0
0.5
1.0
1.5
2.0
INPUT-OUTPUT VOLTAGE (V)
2.5
1460S3 G01
– 0.5
OUTPUT VOLTAGE CHANGE (mV)
125°C
10
4
2.5V Load Regulation, Sinking
120
0
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
100
– 1.0
– 55°C
– 1.5
– 2.0
25°C
– 2.5
125°C
– 3.0
– 3.5
– 4.0
0.1
100
80
60
25°C
125°C
– 55°C
40
20
0
1
10
OUTPUT CURRENT (mA)
100
1460s3 G02
0
1
2
3
4
OUTPUT CURRENT (mA)
5
1460S3 G03
LT1460S3 (SOT-23)
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TYPICAL PERFORMANCE CHARACTERISTICS
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.
2.5V Output Voltage
Temperature Drift
250
THREE TYPICAL PARTS
2.502
2.501
2.500
2.499
2.501
25°C
200
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
2.5V Line Regulation
2.502
25°C
125°C
– 55°C
150
100
2.500
– 55°C
2.499
2.498
125°C
2.497
2.496
50
2.498
2.495
2.497
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
0
125
2.494
5
0
10
15
2
4
1460S3 G06
2.5V Output Impedance
vs Frequency
80
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460S3 G05
2.5V Power Supply Rejection
Ratio vs Frequency
2.5V Transient Response
1000
CL = 0µF
OUTPUT IMPEDANCE (Ω)
60
50
40
30
20
20
LOAD CURRENT (mA)
70
CL = 0.1µF
100
10
CL = 1µF
10
1
0.1
1
200µs/DIV
10
1460S3 G09
CLOAD = 0µF
10
100
FREQUENCY (kHz)
1000
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1460S3 G07
1000
1460S3 G08
2.5V Output Voltage
Noise Spectrum
2.5V Output Noise 0.1Hz to 10Hz
1000
OUTPUT NOISE (20µV/DIV)
1
NOISE VOLTAGE (nV/√Hz)
0
0.1
0
20
INPUT VOLTAGE (V)
1460S3 G04
POWER SUPPLY REJECTION RATIO (dB)
OUTPUT VOLTAGE (V)
2.503
2.5V Supply Current
vs Input Voltage
100
10
100
1k
10k
FREQUENCY (Hz)
100k
TIME (2 SEC/DIV)
1460-2.5 G10
1460S3 G11
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LT1460S3 (SOT-23)
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TYPICAL PERFORMANCE CHARACTERISTICS
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.
10V Minimum Input-Output
Voltage Differential
10V Load Regulation, Sourcing
100
10V Load Regulation, Sinking
35
250
125°C
25°C
– 55°C
1
25
20
15
10
5
– 55°C
0
–5
0
0.5
1.0
1.5
2.0
INPUT-OUTPUT VOLTAGE (V)
125°C
–10
0.1
0.1
2.5
10V Output Voltage
Temperature Drift
10.004
25°C
100
–55°C
50
0
100
1
0
3
4
2
OUTPUT CURRENT (mA)
10V Line Regulation
10.010
350
THREE TYPICAL PARTS
300
SUPPLY CURRENT (µA)
10.000
9.998
9.996
9.994
9.992
9.990
9.988
9.986
5
1460S3 G14
10V Supply Current
vs Input Voltage
10.002
OUTPUT VOLTAGE (V)
125°C
150
1460S3 G13
1460S3 G12
10.006
200
25°C
1
10
OUTPUT CURRENT (mA)
10.005
25°C
250
125°C
– 55°C
200
150
100
OUTPUT VOLTAGE (V)
10
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
30
25°C
10.000
– 55°C
9.995
125°C
9.990
9.985
50
9.984
9.982
– 50 – 25
50
25
0
75
TEMPERATURE (°C)
9.980
0
125
100
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460S3 G15
20
10V Transient Response
20
OUTPUT IMPEDANCE (Ω)
70
60
50
40
30
20
LOAD CURRENT (mA)
CL = 0µF
80
100
CL = 0.1µF
10
CL = 1µF
10
1
0.1
1
200µs/DIV
10
CLOAD = 0µF
1
10
100
FREQUENCY (kHz)
1000
1460S3 G18
6
18
1000
90
0
0.1
14
12
16
10
INPUT VOLTAGE (V)
1560S3 G17
10V Output Impedance
vs Frequency
100
8
1460S3 G16
10V Power Supply Rejection
Ratio vs Frequency
POWER SUPPLY REJECTION RATIO (dB)
6
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
1460S3 G19
1460S3 G20
LT1460S3 (SOT-23)
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TYPICAL PERFORMANCE CHARACTERISTICS
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.
10V Output Voltage
Noise Spectrum
10V Output Noise 0.1Hz to 10Hz
OUTPUT NOISE (20µV/DIV)
NOISE VOLTAGE (µV/√Hz)
10
1
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
TIME (2 SEC/DIV)
1460S3 G10
1460S3 G22
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APPLICATIONS INFORMATION
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
being controlled is not operating at this maximum current,
the shunt reference must always sink this current, resulting 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 regulated does not demand current, the LT1460S3s reduce
their dissipation and battery life is extended. If the references are not delivering load current, they dissipate only
several mW, yet the same connection can deliver 20mA of
load current when demanded.
Capacitive Loads
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
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.
Figure 2 shows the response of the reference to these 1mA
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.
VIN = 2.5V
CIN
0.1µF
LT1460S3-2.5
RL
VOUT
VGEN
CL
2.5V
1.5V
1460S3 F01
Figure 1. Response Time Test Circuit
7
LT1460S3 (SOT-23)
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APPLICATIONS INFORMATION
2.5V
VGEN
1.5V
VOUT
1mA
VOUT
10mA
Table 1 gives the maximum output capacitance for various
load currents and output voltages to avoid instability. Load
capacitors with low ESR (effective series resistance) cause
more ringing than capacitors with higher ESR such as
polarized aluminum or tantalum capacitors.
Table 1. Maximum Output Capacitance
1µs/DIV
IOUT = 1mA
IOUT = 10mA
IOUT = 20mA
2.5V
>10µF
>10µF
2µF
0.68µF
3V
>10µF
>10µF
2µF
0.68µF
3.3V
>10µF
>10µF
1µF
0.68µF
5V
>10µF
>10µF
1µF
0.68µF
10V
>10µF
1µF
0.15µF
0.1µF
1460S3 F02
Figure 2. CL = 0µF
VGEN
2.5V
1.5V
VOUT
1mA
VOUT
10mA
100µs/DIV
VOLTAGE
OPTION IOUT = 100µA
1460S3-5 F03
Figure 3. CL = 0.1µF
VGEN
Long-Term Drift
Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are widely optimistic. The
only way long-term drift can be determined is to measure 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” application. The boards were then placed into a constant temperature 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.
2.5V
1.5V
150
VOUT
1µF
100
VOUT
4.7µF
ppm
50
100µs/DIV
Figure 4. IOUT = 1mA
1460S3 F04
0
– 50
–100
–150
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
Hysteresis data shown in Figure 5 and Figure 6 represents
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. This elevated temperature will
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.
18
16
WORST-CASE HYSTERESIS
ON 40 UNITS
NUMBER OF UNITS
14
Fast Turn-On
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
shows the result of no bypass capacitance on the input and
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.
12
10
70°C TO 25°C
0°C TO 25°C
8
6
7.5V
VIN
4
0V
2
0
–240 –200 –160 –120 – 80 –40 0
40
HYSTERESIS (ppm)
80
120 160 200 240
VOUT
1460S3 F06
0V
Figure 6. 0°C to 70°C Hysteresis
20µs/DIV
9
8
1460S3 F08
Figure 8. CIN = 0µF
WORST-CASE HYSTERESIS
ON 34 UNITS
NUMBER OF UNITS
7
85°C TO 25°C
–40°C TO 25°C
6
5
7.5V
VIN
4
0V
3
2
1
VOUT
0
–600 –500 –400 –300 –200 –100 0 100 200 300 400 500 600
HYSTERESIS (ppm)
1460S3 F07
Figure 7. – 40°C to 85°C Hysteresis
20µs/DIV
1460S3 F08
Figure 9. CIN = 0.1µF
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LT1460S3 (SOT-23)
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APPLICATIONS INFORMATION
Output Accuracy
Like all references, either series or shunt, the error budget
of the LT1460S3s is made up of primarily three components: initial accuracy, temperature coefficient and load
regulation. Line regulation is neglected because it typically
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:
LT1460HCS3
Initial Accuracy = 0.2%
For IOUT = 100µA
∆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
Total worst-case output error is:
0.2% + 0.04% + 0.14% = 0.380%
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
IOUT
LT1460HCS3
LT1460JCS3
LT1460KCS3
0µA
0.340%
0.540%
0.850%
100µA
0.380%
0.580%
0.890%
10mA
0.640%
0.840%
1.15%
20mA
0.540%
0.740%
1.05%
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
1.92
0.075
BSC
0.45 – 0.60
(0.017 – 0.024)
2.10 – 2.64
(0.083 – 0.104)
1.20 – 1.40
(0.047 – 0.060)
REF
0.55
(0.022)
0.09 – 0.18
(0.004 – 0.007)
0.013 – 0.10
(0.0005 – 0.004)
0.89 – 1.12
(0.035 – 0.044)
0.37 – 0.51
(0.015 – 0.020)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT1460S3 (SOT-23)
U
TYPICAL APPLICATIONS
Handling Higher Load Currents
V+
40mA
+
47µF
IN
R1*
LT1460S3
10mA
VOUT
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
Boosted Output Current with No Current Limit
V + ≥ (VOUT + 1.8V)
V + – VOUT
40mA
1460S3 TA05
Boosted Output Current with Current Limit
V+ ≥ VOUT + 2.8V
+
R1
220Ω
R1 =
D1*
LED
47µF
+
R1
220Ω
47µF
8.2Ω
2N2905
2N2905
IN
IN
LT1460S3
VOUT
100mA
OUT
GND
+
LT1460S3
OUT
2µF
SOLID
TANT
1460S3 TA03
GND
+
VOUT
100mA
2µF
SOLID
TANT
* GLOWS IN CURRENT LIMIT,
DO NOT OMIT
1460S3 TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1019
Precision Bandgap Reference
0.05% Max, 5ppm/°C Max
LT1027
Precision 5V Reference
0.02%, 2ppm/°C Max
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
LT1634
Micropower Precision Shunt Reference 1.25V, 2.5V Output
0.05%, 25ppm/°C Max
LTC1798
Micropower Low Dropout Reference, Fixed or Adjustable
0.15% Max, 40ppm/°C, 6.5µA Max Supply Current
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
1460s3f LT/TP 0999 4K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1997
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