LT1460S3 (SOT-23)
Family of Micropower
Series References
in SOT-23
FEATURES
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DESCRIPTIO
s
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
APPLICATIO S
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Handheld Instruments
Precision Regulators
A/D and D/A Converters
Power Supplies
Hard Disk Drives
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.
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 capaci-
tor. This feature is important in applications where PC board
space is a premium or fast settling is demanded. Reverse-
battery protection keeps these references from conducting
reverse current.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Typical Distribution of SOT-23 LT1460HC
V
OUT
After
IR Reflow Solder
32
Basic Connection
LT1460S3
V
OUT
+ 0.9V
≤
V
IN
≤
20V
C1
0.1µF
IN
GND
1460S3 TA01
28
LT1460HC LIMITS
24
DISTRIBUTION (%)
20
16
12
8
4
0
– 0.3
– 0.2
0.1
0.2
0
OUTPUT VOLTAGE ERROR (%)
– 0.1
0.3
OUT
V
OUT
U
1460S3 TA02
U
U
1
LT1460S3 (SOT-23)
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
Input Voltage ........................................................... 30V
Reverse Voltage .................................................... – 15V
Output Short-Circuit Duration, T
A
= 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
PACKAGE/ORDER INFORMATION
ORDER PART
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
S3
PART MARKING
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
T
JMAX
= 125°C,
θ
JA
= 325°C/ W
Consult factory for Industrial and Military grade parts.
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
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
2
U
U
W
W W
U
U
W
LT1460S3 (SOT-23)
The
q
denotes specifications which apply over the full specified
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
+ 2.5V, I
OUT
= 0 unless otherwise specified.
PARAMETER
Output Voltage Tolerance (Note 4)
CONDITIONS
LT1460HCS3
LT1460JCS3
LT1460KCS3
Output Voltage Temperature Coefficient (Note 5)
LT1460HCS3
LT1460JCS3
LT1460KCS3
V
OUT
+ 0.9V
≤
V
IN
≤
V
OUT
+ 2.5V
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
– 0.2
– 0.4
– 0.5
TYP
MAX
0.2
0.4
0.5
UNITS
%
%
%
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mW
V
V
V
mA
µA
ppm (P-P)
ppm (RMS)
ppm/√kHr
ppm
ppm
10
10
25
150
50
20
20
50
800
1000
100
130
3000
4000
200
300
70
100
10
0.9
1.3
1.4
Line Regulation
V
OUT
+ 2.5V
≤
V
IN
≤
20V
q
Load Regulation Sourcing (Note 6)
I
OUT
= 100µA
q
1000
50
q
I
OUT
= 10mA
I
OUT
= 20mA
q
20
2.5
q
q
Thermal Regulation (Note 7)
Dropout Voltage (Note 8)
∆P
= 200mW
V
IN
– V
OUT
,
∆V
OUT
≤
0.2%, I
OUT
= 0
V
IN
– V
OUT
,
∆V
OUT
≤
0.2%, I
OUT
= 10mA
Output Current
Reverse Leakage
Output Voltage Noise (Note 9)
Long-Term Stability of Output Voltage (Note 10)
Hysteresis (Note 11)
Supply Current
Short V
OUT
to GND
V
IN
= – 15V
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
∆T
= 0°C to 70°C
∆T
= –40°C to 85°C
LT1460S3-2.5
q
q
q
q
40
0.5
4
4
100
50
250
115
145
q
10
145
175
180
220
180
220
200
240
270
350
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
LT1460S3-3
LT1460S3-3.3
q
145
160
q
LT1460S3-5
LT1460S3-10
q
215
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.
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.
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 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.
TYPICAL PERFORMANCE CHARACTERISTICS
2.5V Minimum Input-Output
Voltage Differential
100
OUTPUT VOLTAGE CHANGE (mV)
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.
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
10
125°C
25°C
1
– 55°C
0.1
0
0.5
1.0
1.5
2.0
INPUT-OUTPUT VOLTAGE (V)
2.5
4
U W
1460S3 G01
2.5V Load Regulation, Sourcing
0
– 0.5
– 1.0
– 55°C
– 1.5
– 2.0
25°C
– 2.5
125°C
– 3.0
– 3.5
– 4.0
0.1
1
10
OUTPUT CURRENT (mA)
100
1460s3 G02
2.5V Load Regulation, Sinking
120
100
80
60
25°C
40
20
0
0
1
2
3
4
OUTPUT CURRENT (mA)
5
1460S3 G03
125°C
– 55°C
LT1460S3 (SOT-23)
TYPICAL PERFORMANCE CHARACTERISTICS
2.5V Output Voltage
Temperature Drift
2.503
2.502
SUPPLY CURRENT (µA)
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 Supply Current
vs Input Voltage
250
25°C
OUTPUT VOLTAGE (V)
THREE TYPICAL PARTS
OUTPUT VOLTAGE (V)
2.501
2.500
2.499
2.498
2.497
–50 –25
50
25
75
0
TEMPERATURE (°C)
2.5V Power Supply Rejection
Ratio vs Frequency
80
POWER SUPPLY REJECTION RATIO (dB)
70
OUTPUT IMPEDANCE (Ω)
60
50
40
30
20
10
0
0.1
1
10
100
FREQUENCY (kHz)
1000
1460S3 G07
100
C
L
= 0.1µF
LOAD CURRENT (mA)
2.5V Output Voltage
Noise Spectrum
1000
100
10
100
1k
10k
FREQUENCY (Hz)
100k
1460-2.5 G10
1460S3 G11
OUTPUT NOISE (20µV/DIV)
NOISE VOLTAGE (nV/√Hz)
U W
100
2.5V Line Regulation
2.502
2.501
25°C
2.500
2.499
2.498
125°C
2.497
2.496
2.495
– 55°C
– 55°C
200
125°C
150
100
50
125
0
2.494
0
5
10
INPUT VOLTAGE (V)
15
20
1460S3 G05
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460S3 G06
1460S3 G04
2.5V Output Impedance
vs Frequency
1000
C
L
= 0µF
2.5V Transient Response
20
10
10
C
L
= 1µF
1
1
0.1
200µs/DIV
C
LOAD
= 0µF
1460S3 G09
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
1460S3 G08
2.5V Output Noise 0.1Hz to 10Hz
TIME (2 SEC/DIV)
5
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