FeaTures
n
LT6654
SOT-23 Precision Wide
Supply High Output Drive
Low Noise Reference
DescripTion
The LT
®
6654 is a family of small precision voltage ref-
erences that offers high accuracy, low noise, low drift,
low dropout and low power. The LT6654 operates from
voltages up to 36V and is fully specified from –55°C to
125°C. A buffered output ensures ±10mA of output drive
with low output impedance and precise load regulation.
These features, in combination, make the LT6654 ideal
for portable equipment, industrial sensing and control,
and automotive applications.
The LT6654 was designed with advanced manufactur-
ing techniques and curvature compensation to provide
10ppm/°C temperature drift and 0.05% initial accuracy.
Low thermal hysteresis ensures high accuracy and
1.6ppm
P-P
noise minimizes measurement uncertainty.
Since the LT6654 can also sink current, it can operate
as a low power negative voltage reference with the same
precision as a positive reference.
The LT6654 is offered in a 6-lead SOT-23 package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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Low Drift:
A Grade: 10ppm/°C Max
B Grade: 20ppm/°C Max
High Accuracy:
A Grade: ±0.05% Max
B Grade: ±0.10% Max
Low Noise: 1.6ppm
P-P
(0.1Hz to 10Hz)
Wide Supply Range to 36V
Low Thermal Hysteresis
Line Regulation (Up to 36V): 5ppm/V Max
Low Dropout Voltage: 100mV Max
Sinks and Sources ±10mA
Load Regulation at 10mA: 8ppm/mA Max
Easily Configured for Negative Voltage Output
Fully Specified from –55°C to 125°C
Available Output Voltage Options: 1.25V, 2.048V, 2.5V,
3V, 3.3V, 4.096V, 5V
Low Profile (1mm) ThinSOT™ Package
Automotive Control and Monitoring
High Temperature Industrial
High Resolution Data Acquisition Systems
Instrumentation and Process Control
Precision Regulators
Medical Equipment
applicaTions
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Typical applicaTion
Basic Connection
(V
OUT
+ 0.5V) < V
IN
< 36V
4
C
IN
0.1µF
LT6654
1
2
6
C
L
1µF
6654 TA01a
Output Voltage Temperature Drift
0.10
3 TYPICAL PARTS
LT6654-2.5
V
OUT
ACCURACY (%)
V
OUT
0.05
0.00
–0.05
–0.10
–60 –40 –20 0 20 40
60 80 100 120 140
TEMPERATURE (°C)
6654 TA01b
6654fb
1
LT6654
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
GND* 1
GND 2
DNC 3
6 V
OUT
5 DNC
4 V
IN
Input Voltage V
IN
to GND ........................... –0.3V to 38V
Output Voltage V
OUT
.........................–0.3V to V
IN
+ 0.3V
Output Short-Circuit Duration ......................... Indefinite
Specified Temperature Range
H-Grade ............................................. –40°C to 125°C
MP-Grade .......................................... –55°C to 125°C
Operating Temperature Range................ –55°C to 125°C
Storage Temperature Range (Note 2)..... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)
(Note 9)................................................................. 300°C
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 192°C/W
DNC: DO NOT CONNECT
*CONNECT PIN TO DEVICE GND (PIN 2)
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
LT6654AHS6-1.25#TRMPBF
LT6654AHS6-1.25#TRPBF
LTFVD
6-Lead Plastic TSOT-23
LT6654BHS6-1.25#TRMPBF
LT6654BHS6-1.25#TRPBF
LTFVD
6-Lead Plastic TSOT-23
LT6654AMPS6-1.25#TRMPBF
LT6654AMPS6-1.25#TRPBF
LTFVD
6-Lead Plastic TSOT-23
LT6654BMPS6-1.25#TRMPBF
LT6654BMPS6-1.25#TRPBF
LTFVD
6-Lead Plastic TSOT-23
LT6654AHS6-2.048#TRMPBF
LT6654AHS6-2.048#TRPBF
LTFVF
6-Lead Plastic TSOT-23
LT6654BHS6-2.048#TRMPBF
LT6654BHS6-2.048#TRPBF
LTFVF
6-Lead Plastic TSOT-23
LT6654AMPS6-2.048#TRMPBF LT6654AMPS6-2.048#TRPBF LTFVF
6-Lead Plastic TSOT-23
LT6654BMPS6-2.048#TRMPBF LT6654BMPS6-2.048#TRPBF LTFVF
6-Lead Plastic TSOT-23
LT6654AHS6-2.5#TRMPBF
LT6654AHS6-2.5#TRPBF
LTFJY
6-Lead Plastic TSOT-23
LT6654BHS6-2.5#TRMPBF
LT6654BHS6-2.5#TRPBF
LTFJY
6-Lead Plastic TSOT-23
LT6654AMPS6-2.5#TRMPBF
LT6654AMPS6-2.5#TRPBF
LTFJY
6-Lead Plastic TSOT-23
LT6654BMPS6-2.5#TRMPBF
LT6654BMPS6-2.5#TRPBF
LTFJY
6-Lead Plastic TSOT-23
LT6654AHS6-3#TRMPBF
LT6654AHS6-3#TRPBF
LTFVG
6-Lead Plastic TSOT-23
LT6654BHS6-3#TRMPBF
LT6654BHS6-3#TRPBF
LTFVG
6-Lead Plastic TSOT-23
LT6654AMPS6-3#TRMPBF
LT6654AMPS6-3#TRPBF
LTFVG
6-Lead Plastic TSOT-23
LT6654BMPS6-3#TRMPBF
LT6654BMPS6-3#TRPBF
LTFVG
6-Lead Plastic TSOT-23
LT6654AHS6-3.3#TRMPBF
LT6654AHS6-3.3#TRPBF
LTFVH
6-Lead Plastic TSOT-23
LT6654BHS6-3.3#TRMPBF
LT6654BHS6-3.3#TRPBF
LTFVH
6-Lead Plastic TSOT-23
LT6654AMPS6-3.3#TRMPBF
LT6654AMPS6-3.3#TRPBF
LTFVH
6-Lead Plastic TSOT-23
LT6654BMPS6-3.3#TRMPBF
LT6654BMPS6-3.3#TRPBF
LTFVH
6-Lead Plastic TSOT-23
LT6654AHS6-4.096#TRMPBF
LT6654AHS6-4.096#TRPBF
LTFVJ
6-Lead Plastic TSOT-23
LT6654BHS6-4.096#TRMPBF
LT6654BHS6-4.096#TRPBF
LTFVJ
6-Lead Plastic TSOT-23
LT6654AMPS6-4.096#TRMPBF LT6654AMPS6-4.096#TRPBF LTFVJ
6-Lead Plastic TSOT-23
LT6654BMPS6-4.096#TRMPBF LT6654BMPS6-4.096#TRPBF LTFVJ
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
LT6654AHS6-5#TRMPBF
LT6654AHS6-5#TRPBF
LTFVK
LT6654BHS6-5#TRMPBF
LT6654BHS6-5#TRPBF
LTFVK
6-Lead Plastic TSOT-23
LT6654AMPS6-5#TRMPBF
LT6654AMPS6-5#TRPBF
LTFVK
6-Lead Plastic TSOT-23
LT6654BMPS6-5#TRMPBF
LT6654BMPS6-5#TRPBF
LTFVK
6-Lead Plastic TSOT-23
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
SPECIFIED TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
6654fb
2
LT6654
available opTions
INITIAL ACCURACY
TEMPERATURE COEFFICIENT
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
2.048V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
2.5V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
3V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
3.3V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
4.096V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
5V
0.05%
10ppm/°C
0.1%
20ppm/°C
0.05%
10ppm/°C
0.1%
20ppm/°C
** See the Order Information section for complete part number listing.
OUTPUT VOLTAGE
1.25V
ORDER PART NUMBER**
LT6654AHS6-1.25
LT6654BHS6-1.25
LT6654AMPS6-1.25
LT6654BMPS6-1.25
LT6654AHS6-2.048
LT6654BHS6-2.048
LT6654AMPS6-2.048
LT6654BMPS6-2.048
LT6654AHS6-2.5
LT6654BHS6-2.5
LT6654AMPS6-2.5
LT6654BMPS6-2.5
LT6654AHS6-3
LT6654BHS6-3
LT6654AMPS6-3
LT6654BMPS6-3
LT6654AHS6-3.3
LT6654BHS6-3.3
LT6654AMPS6-3.3
LT6654BMPS6-3.3
LT6654AHS6-4.096
LT6654BHS6-4.096
LT6654AMPS6-4.096
LT6654BMPS6-4.096
LT6654AHS6-5
LT6654BHS6-5
LT6654AMPS6-5
LT6654BMPS6-5
SPECIFIED TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, C
L
= 1µF and V
IN
= V
OUT
+ 0.5V, unless otherwise noted.
For LT6654-1.25, V
IN
= 2.4V, unless otherwise noted.
PARAMETER
Output Voltage Accuracy
CONDITIONS
LT6654A
LT6654B
LT6654AH
LT6654BH
LT6654AMP
LT6654BMP
LT6654A
LT6654B
V
OUT
+ 0.5V ≤ V
IN
≤ 36V
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
2.4V ≤ V
IN
≤ 36V
LT6654-1.25
Load Regulation (Note 4)
I
OUT(SOURCE)
= 10mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
LT6654-1.25
MIN
–0.05
–0.10
–0.215
–0.43
–0.23
–0.46
3
10
1.2
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elecTrical characTerisTics
TYP
MAX
0.05
0.10
0.215
0.43
0.23
0.46
10
20
5
10
5
10
8
15
15
20
UNITS
%
%
%
%
%
%
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
6654fb
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l
l
l
l
l
Output Voltage Temperature Coefficient (Note 3)
Line Regulation
1.2
l
3
l
6
l
3
LT6654
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, C
L
= 1µF and V
IN
= V
OUT
+ 0.5V, unless otherwise noted.
For LT6654-1.25, V
IN
= 2.4V, unless otherwise noted.
PARAMETER
Load Regulation (Note 4)
CONDITIONS
I
OUT(SINK)
= 10mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
LT6654-1.25
V
IN
– V
OUT
, ∆V
OUT
= 0.1%
I
OUT
= 0mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
I
OUT(SOURCE)
= 10mA
I
OUT(SINK)
= –10mA
LT6654-1.25, ∆V
OUT
= 0.1%, I
OUT
= 0mA
LT6654-1.25, ∆V
OUT
= 0.1%, I
OUT
= ±10mA
Supply Current
Output Short-Circuit Current
Output Voltage Noise (Note 6)
No Load
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l
l
elecTrical characTerisTics
MIN
TYP
9
MAX
20
30
25
30
100
120
450
50
UNITS
ppm/mA
ppm/mA
ppm/mA
ppm/mA
mV
mV
mV
mV
V
V
V
µA
µA
mA
mA
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
RMS
µs
ppm/√kHr
ppm
ppm
ppm
ppm
l
15
l
Dropout Voltage (Note 5)
55
l
l
l
Minimum Input Voltage
1.5
1.6
1.8
2.4
600
350
40
30
0.8
1.0
1.5
1.6
1.7
2.0
2.2
2.0
150
60
30
40
90
100
Short V
OUT
to GND
Short V
OUT
to V
IN
0.1Hz ≤ f ≤ 10Hz
LT6654-1.25
LT6654-2.048
LT6654-2.5
LT6654-3
LT6654-3.3
LT6654-4.096
LT6654-5
10Hz ≤ f ≤ 1kHz
0.1% Settling, C
LOAD
= 1µF
∆T = 0°C to 70°C
∆T = –40°C to 85°C
∆T = –40°C to 125°C
∆T = –55°C to 125°C
Turn-On Time
Long-Term Drift of Output Voltage (Note 7)
Hysteresis (Note 8)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
Note 3:
Temperature coefficient is measured by dividing the maximum
change in output voltage by the specified temperature range.
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:
Excludes load regulation errors.
Note 6:
Peak-to-peak noise is measured with a 1-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 seconds. RMS noise is measured on a spectrum analyzer in
a shielded environment where the intrinsic noise of the instrument is
removed to determine the actual noise of the device.
Note 7:
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:
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 the hot or cold temperature limit before successive
measurements. Hysteresis measures the maximum output change for the
averages of three hot or cold temperature cycles. For instruments that
are stored at well controlled temperatures (within 20 or 30 degrees of
operational temperature), it’s usually not a dominant error source.
Note 9:
The stated temperature is typical for soldering of the leads during
manual rework. For detailed IR reflow recommendations, refer to the
Applications Information section.
6654fb
4
LT6654
Typical perForMance characTerisTics
1.25V Output Voltage
Temperature Drift
1.2520
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
6654 G01
The characteristic curves are similar across the
LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all
voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
1.25V Turn-On Characteristics
100
1.25V Output Impedance
vs Frequency
THREE TYPICAL PARTS
V
IN
1V/DIV
GND
OUTPUT IMPEDANCE (Ω)
REFERENCE VOLTAGE (V)
10
C
L
= 1µF
1
V
OUT
0.5V/DIV
GND
20µs/DIV
6654 G02
0.1
C
L
= 10µF
C
LOAD
= 1µF
0.01
0.1
1
10
100
FREQUENCY (kHz)
1000
6654 G03
1.25V Load Regulation (Sourcing)
30
OUTPUT VOLTAGE CHANGE (ppm)
–55°C
OUTPUT VOLTAGE CHANGE (ppm)
20
10
0
–10
–20
–30
–40
–50
0.1
1
OUTPUT CURRENT (mA)
10
6654 G04
1.25V Load Regulation (Sinking)
200
180
160
140
120
100
80
60
40
20
0
0.1
–55°C
1
OUTPUT CURRENT (mA)
10
6654 G05
1.25V Output Noise 0.1Hz to 10Hz
125°C
OUTPUT NOISE (1µV/DIV)
–40°C
0
–40°C
125°C
25°C
25°C
1
2
3
4 5 6 7
TIME (1s/DIV)
8
9
10
6654 G06
1.25V Minimum Input Voltage
(Sourcing)
10
10
1.25V Minimum Input Voltage
(Sinking)
400
350
25°C
1.2V Output Voltage Noise
Spectrum
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
NOISE VOLTAGE (nV√Hz)
300
250
200
150
100
50
I
O
= 0µA
I
O
= 5mA
125°C
1
25°C
–55°C
–40°C
125°C
1
–55°C
–40°C
0.1
1
1.2 1.4 1.6 1.8
2
2.2
MINIMUM INPUT VOLTAGE (V)
2.4
0.1
1
1.1
1.2 1.3 1.4 1.5 1.6 1.7
MINIMUM INPUT VOLTAGE (V)
1.8
0
0.01
0.1
1
10
FREQUENCY (kHz)
100
6654 G09
6654 G07
6654 G08
6654fb
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