CAD | USD

LT6654 Datasheet

Linear Technology/Analog Devices

View All Related Products | Download PDF Datasheet

Datasheet

LT6654
1
6654fh
For more information www.linear.com/LT6654
Typical applicaTion
DescripTion
Precision Wide
Supply High Output Drive
Low Noise Reference
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
1.6ppmP-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 references are offered in 6-lead SOT-23
package and an 8-lead LS8 package. The LS8 is a 5mm
× 5mm surface mount hermetic package that provides
outstanding stability.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
Basic Connection
n Low Drift:
n A-Grade: 10ppm/°C Max
n B-Grade: 20ppm/°C Max
n High Accuracy:
n A-Grade: ±0.05% Max
n B-Grade: ±0.10% Max
n Low Noise: 1.6ppmP-P (0.1Hz to 10Hz)
n Wide Supply Range to 36V
n Low Thermal Hysteresis: LS8 15ppm (40°C to 125°C)
n Long Term Drift: (LS8) 15ppm/√kHr
n Line Regulation (Up to 36V): 5ppm/V Max
n Low Dropout Voltage: 100mV Max
n Sinks and Sources ±10mA
n Load Regulation at 10mA: 8ppm/mA Max
n Fully Specified from –55°C to 125°C
n Available Output Voltage Options: 1.25V, 2.048V,
2.5V, 3V, 3.3V, 4.096V, 5V
n Low Profile (1mm) ThinSOT™ Package and 5mm ×
5mm Surface Mount Hermetic Package
FeaTures
applicaTions
n Automotive Control and Monitoring
n High Temperature Industrial
n High Resolution Data Acquisition Systems
n Instrumentation and Process Control
n Precision Regulators
n Medical Equipment
Output Voltage Temperature Drift
LT6654
CIN
0.1µF
(VOUT + 0.5V) < VIN < 36V OUTIN
GND CL
F
VOUT
6654 TA01a
TEMPERATURE (°C)
–60
–0.10
VOUT ACCURACY (%)
–0.05
0.05
0.00
0.10
40200–40 –20
6654 TA01b
140
100 120
60 80
3 TYPICAL PARTS
LT6654-2.5
LT6654
2
6654fh
For more information www.linear.com/LT6654
pin conFiguraTion
absoluTe MaxiMuM raTings
(Note 1)
1
2
3
6
5
4
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
VOUT
DNC
VIN
GND*
GND
DNC
TJMAX = 150°C, θJA = 192°C/W
DNC: CONNECTED INTERNALLY
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
*CONNECT PIN TO DEVICE GND (PIN 2)
1
2
3
DNC
NC
GND
7
6
5
DNC
VOUT
VOUT
4
GND*
8
VIN
TOP VIEW
LS8 PACKAGE
8-PIN LEADLESS CHIP CARRIER (5mm × 5mm)
TJMAX = 150°C, θJA = 125°C/W
DNC: CONNECTED INTERNALLY
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
*CONNECT PIN TO DEVICE GND (PIN 3)
Input Voltage VIN to GND ........................... 0.3V to 38V
Output Voltage VOUT ........................ 0.3V to VIN + 0.3V
Output Short-Circuit Duration ......................... Indefinite
Specified Temperature Range
I-Grade.................................................40°C to 85°C
H-Grade ............................................. 40°C to 125°C
MP-Grade .......................................... 55°C to 125°C
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6654AIS6-1.25#TRMPBF LT6654AIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-1.25#TRMPBF LT6654BIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-1.25#TRMPBF LT6654AHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-1.25#TRMPBF LT6654BHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-1.25#TRMPBF LT6654AMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-1.25#TRMPBF LT6654BMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-2.048#TRMPBF LT6654AIS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-2.048#TRMPBF LT6654BIS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-2.048#TRMPBF LT6654AHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-2.048#TRMPBF LT6654BHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-2.048#TRMPBF LT6654AMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-2.048#TRMPBF LT6654BMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-2.5#TRMPBF LT6654AIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-2.5#TRMPBF LT6654BIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 85°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
orDer inForMaTion
http://www.linear.com/product/LT6654#orderinfo
LT6654
3
6654fh
For more information www.linear.com/LT6654
orDer inForMaTion
http://www.linear.com/product/LT6654#orderinfo
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6654AHS6-2.5#TRMPBF LT6654AHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-2.5#TRMPBF LT6654BHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-2.5#TRMPBF LT6654AMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-2.5#TRMPBF LT6654BMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-3#TRMPBF LT6654AIS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-3#TRMPBF LT6654BIS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-3#TRMPBF LT6654AHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-3#TRMPBF LT6654BHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-3#TRMPBF LT6654AMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-3#TRMPBF LT6654BMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-3.3#TRMPBF LT6654AIS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-3.3#TRMPBF LT6654BIS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-3.3#TRMPBF LT6654AHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-3.3#TRMPBF LT6654BHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-3.3#TRMPBF LT6654AMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-3.3#TRMPBF LT6654BMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-4.096#TRMPBF LT6654AIS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-4.096#TRMPBF LT6654BIS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-4.096#TRMPBF LT6654AHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-4.096#TRMPBF LT6654BHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-4.096#TRMPBF LT6654AMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-4.096#TRMPBF LT6654BMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654AIS6-5#TRMPBF LT6654AIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654BIS6-5#TRMPBF LT6654BIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 85°C
LT6654AHS6-5#TRMPBF LT6654AHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654BHS6-5#TRMPBF LT6654BHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 125°C
LT6654AMPS6-5#TRMPBF LT6654AMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –55°C to 125°C
LT6654BMPS6-5#TRMPBF LT6654BMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –55°C to 125°C
LEAD FREE FINISHPART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6654AHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654BHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654AHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654BHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654AHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654BHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654AHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
LT6654BHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C
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.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
LT6654
4
6654fh
For more information www.linear.com/LT6654
available opTions
OUTPUT VOLTAGE INITIAL ACCURACY TEMPERATURE COEFFICIENT ORDER PART NUMBER** SPECIFIED TEMPERATURE RANGE
1.25V 0.05%
0.1%
0.05%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-1.25
LT6654BIS6-1.25
LT6654AHS6-1.25
LT6654BHS6-1.25
LT6654AMPS6-1.25
LT6654BMPS6-1.25
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
2.048V 0.05%
0.1%
0.05%
0.05%
0.1%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
10ppm/°C
20ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-2.048
LT6654BIS6-2.048
LT6654AHS6-2.048
LT6654AHLS8-2.048
LT6654BHS6-2.048
LT6654BHLS8-2.048
LT6654AMPS6-2.048
LT6654BMPS6-2.048
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
2.5V 0.05%
0.1%
0.05%
0.05%
0.1%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
10ppm/°C
20ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-2.5
LT6654BIS6-2.5
LT6654AHS6-2.5
LT6654AHLS8-2.5
LT6654BHS6-2.5
LT6654BHLS8-2.5
LT6654AMPS6-2.5
LT6654BMPS6-2.5
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
3V 0.05%
0.1%
0.05%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-3
LT6654BIS6-3
LT6654AHS6-3
LT6654BHS6-3
LT6654AMPS6-3
LT6654BMPS6-3
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
3.3V 0.05%
0.1%
0.05%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-3.3
LT6654BIS6-3.3
LT6654AHS6-3.3
LT6654BHS6-3.3
LT6654AMPS6-3.3
LT6654BMPS6-3.3
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
4.096V 0.05%
0.1%
0.05%
0.05%
0.1%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
10ppm/°C
20ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-4.096
LT6654BIS6-4.096
LT6654AHS6-4.096
LT6654AHLS8-4.096
LT6654BHS6-4.096
LT6654BHLS8-4.096
LT6654AMPS6-4.096
LT6654BMPS6-4.096
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
5V 0.05%
0.1%
0.05%
0.05%
0.1%
0.1%
0.05%
0.1%
10ppm/°C
20ppm/°C
10ppm/°C
10ppm/°C
20ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
LT6654AIS6-5
LT6654BIS6-5
LT6654AHS6-5
LT6654AHLS8-5
LT6654BHS6-5
LT6654BHLS8-5
LT6654AMPS6-5
LT6654BMPS6-5
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
** See the Order Information section for complete part number listing.
LT6654
5
6654fh
For more information www.linear.com/LT6654
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, CL = 1µF and VIN = VOUT + 0.5V, unless otherwise noted.
For LT6654-1.25, VIN = 2.4V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Accuracy LT6654A
LT6654B
LT6654AI
LT6654BI
LT6654AH
LT6654BH
LT6654AMP
LT6654BMP
l
l
l
l
l
l
–0.05
–0.10
–0.175
–0.35
–0.215
–0.43
–0.23
–0.46
0.05
0.10
0.175
0.35
0.215
0.43
0.23
0.46
%
%
%
%
%
%
%
%
Output Voltage Temperature Coefficient (Note 3) LT6654A
LT6654B
l
l
3
10
10
20
ppm/°C
ppm/°C
Line Regulation VOUT + 0.5V ≤ VIN ≤ 36V
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
l
1.2
5
10
ppm/V
ppm/V
2.4V ≤ VIN ≤ 36V
LT6654-1.25
l
1.2 5
10
ppm/V
ppm/V
Load Regulation (Note 4) IOUT(SOURCE) = 10mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
LT6654-1.25
LT6654LS8
l
l
l
3
6
10
8
15
15
20
30
45
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
Load Regulation (Note 4) IOUT(SINK) = 10mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
LT6654-1.25
LT6654LS8
l
l
l
9
15
30
20
30
25
30
60
90
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
Dropout Voltage (Note 5) VIN – VOUT, ∆VOUT = 0.1%
IOUT = 0mA
LT6654-2.048, LT6654-2.5, LT6654-3,
LT6654-3.3, LT6654-4.096, LT6654-5
IOUT(SOURCE) = 10mA
IOUT(SINK) = –10mA
l
l
l
55
100
120
450
50
mV
mV
mV
mV
Minimum Input Voltage LT6654-1.25, ∆VOUT = 0.1%, IOUT = 0mA
LT6654-1.25, ∆VOUT = 0.1%, IOUT = ±10mA
l
l
1.5 1.6
1.8
2.4
V
V
V
Supply Current No Load
l
350
600
µA
µA
Output Short-Circuit Current Short VOUT to GND
Short VOUT to VIN
40
30
mA
mA
Output Voltage Noise (Note 6) 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
0.8
1.0
1.5
1.6
1.7
2.0
2.2
2.0
ppmP-P
ppmP-P
ppmP-P
ppmP-P
ppmP-P
ppmP-P
ppmP-P
ppmRMS
Turn-On Time 0.1% Settling, CLOAD = 1µF 150 µs
LT6654
6
6654fh
For more information www.linear.com/LT6654
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 is usually not a dominant error source. Typical
hysteresis is the worst-case of 25°C to cold to 25°C or 25°C to hot to
25°C, preconditioned by one thermal cycle.
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Long-Term Drift of Output Voltage (Note 7) LT6654S6
LT6654LS8
60
15
ppm/√kHr
ppm/√kHr
Hysteresis (Note 8) S6
∆T = 0°C to 70°C
∆T = –40°C to 85°C
∆T = –40°C to 125°C
∆T = –55°C to 125°C
LS8
∆T = 0°C to 70°C
∆T = –40°C to 85°C
∆T = –40°C to 125°C
∆T = –55°C to 125°C
15
30
40
50
3
11
15
20
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, CL = 1µF and VIN = VOUT + 0.5V, unless otherwise noted.
For LT6654-1.25, VIN = 2.4V, unless otherwise noted.
elecTrical characTerisTics
LT6654
7
6654fh
For more information www.linear.com/LT6654
Typical perForMance characTerisTics
1.25V Load Regulation (Sourcing) 1.25V Load Regulation (Sinking) 1.25V Output Noise 0.1Hz to 10Hz
1.25V Minimum Input Voltage
(Sourcing)
1.25V Minimum Input Voltage
(Sinking)
1.2V Output Voltage Noise
Spectrum
1.25V Output Voltage
Temperature Drift 1.25V Turn-On Characteristics
1.25V Output Impedance
vs Frequency
TEMPERATURE (°C)
–60
1.2485
1.2490
1.2495
REFERENCE VOLTAGE (V)
1.2500
1.2505
1.2510
1.2515
1.2520
–40 –20 0
6654 G01
20 40 60 80 140100 120
THREE TYPICAL PARTS
OUTPUT CURRENT (mA)
0.1
–50
–40
OUTPUT VOLTAGE CHANGE (ppm)
–30
–20
–10
0
30
20
10
1
6654 G04
10
40°C
25°C
125°C
55°C
OUTPUT CURRENT (mA)
0.1
0
OUTPUT VOLTAGE CHANGE (ppm)
40
80
20
60
100
140
160
180
120
200
1
6654 G05
10
125°C
–40°C
–55°C
25°C
OUTPUT NOISE (1µV/DIV)
TIME (1s/DIV)
6654 G06
109876543210
MINIMUM INPUT VOLTAGE (V)
11.2 1.4 1.6 1.8 22.2
0.1
OUTPUT CURRENT (mA)
1
10
6654 G07
2.4
25°C 40°C
55°C
125°C
MINIMUM INPUT VOLTAGE (V)
11.1 1.2 1.3 1.4 1.5 1.6 1.7
0.1
OUTPUT CURRENT (mA)
1
10
6654 G08
1.8
–40°C
–55°C
125°C
25°C
FREQUENCY (kHz)
0.01 0.1 110
0
50
100
150
250
300
350
NOISE VOLTAGE (nV√Hz)
200
400
6654 G09
100
IO = 5mA
IO = 0µA
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.
20µs/DIV
GND
GND
VIN
1V/DIV
VOUT
0.5V/DIV
6654 G02
CLOAD = 1µF FREQUENCY (kHz)
0.1
0.01
OUTPUT IMPEDANCE (Ω)
0.1
10
1
100
110 100
6654 G03
1000
CL = 1µF
CL = 10µF
LT6654
8
6654fh
For more information www.linear.com/LT6654
Typical perForMance characTerisTics
2.5V Load Regulation (Sourcing) 2.5V Load Regulation (Sinking) 2.5V Output Noise 0.1Hz to 10Hz
2.5V Minimum VIN to VOUT
Differential (Sourcing)
2.5V Minimum VIN to VOUT
Differential (Sinking)
2.5V Output Voltage Noise
Spectrum
2.5V Output Voltage
Temperature Drift
2.5V Supply Current
vs Input Voltage 2.5V Line Regulation
TEMPERATURE (°C)
–60 –20 20 60 140100
2.498
2.499
2.500
2.501
OUTPUT VOLTAGE (V)
2.502
6654 G10
THREE TYPICAL PARTS
INPUT VOLTAGE (V)
0 5 10 15 20 25 30 35
0
INPUT CURRENT (µA)
300
600
500
400
100
200
6654 G11
40
–55°C
125°C
–40°C
25°C
INPUT VOLTAGE (V)
0 5 10 15 20 25 30 35
2.4950
2.4960
OUTPUT VOLTAGE (V)
2.5000
2.5050
2.5030
2.5010
2.5040
2.5020
2.4970
2.4980
2.4990
6654 G12
40
–40°C
–55°C
25°C
125°C
OUTPUT CURRENT (mA)
0.1 1
–40
–30
–20
–10
OUTPUT VOLTAGE CHANGE (ppm)
0
10
10
–55°C
25°C
125°C
–40°C
OUTPUT CURRENT (mA)
0.1 1
0
100
120
140
OUTPUT VOLTAGE CHANGE (ppm)
160
20
40
60
80
180
6654 G14
10
125°C
–55°C
–40°C
25°C
TIME (1s/DIV)
OUTPUT NOISE (1µV/DIV)
6654 G15
INPUT-OUTPUT VOLTAGE (mV)
0200 300
0.1
1
OUTPUT CURRENT (mA)
10
6654 G16
400
15010050 250
350
25°C
–55°C
–40°C
125°C
INPUT-OUTPUT VOLTAGE (mV)
–300 –100 0
0.1
1
OUTPUT CURRENT (mA)
10
6654 G17
100
–150–200–250 –50
50
–40°C
25°C
55°C
125°C
FREQUENCY (kHz)
0.01 0.1 110
0
50
100
150
250
300
350
NOISE VOLTAGE (nV√Hz)
200
400
6654 G18
100
IO = 5mA
IO = 0µA
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.
LT6654
9
6654fh
For more information www.linear.com/LT6654
Typical perForMance characTerisTics
2.5V Turn-On Characteristics 2.5V Line Transient Response
2.5V Load Transient Response
(Sourcing)
2.5V Hysteresis Plot for –40°C
and 125°C (TSOT-23)
2.5V Hysteresis Plot for –40°C
and 125°C (LS8)
2.5V Long Term Drift (TSOT-23)
2.5V Integrated Noise
10Hz to 10kHz
2.5V Power Supply Rejection
Ratio vs Frequency
2.5V Output Impedance
vs Frequency
FREQUENCY (kHz)
0.01 0.1 1
0.1
1
10
INTEGRATED NOISE (µVRMS)
100
6654 G19
10
FREQUENCY (kHz)
0.1 110 100
–100
–90
–80
–70
–50
–40
–30
POWER SUPPLY REJECTION RATIO (dB)
–60
–20
6654 G20
1000
CL = 1µF
CL = 10µF
FREQUENCY (kHz)
110 100
0.1
1
10
OUTPUT IMPEDANCE (Ω)
100
6654 G21
1000
CL = 10µF
CL = 1µF
20µs/DIV
GND
GND
VIN
1V/DIV
VOUT
1V/DIV
6654 G22
CLOAD = 1µF 50µs/DIV
VIN
0.5V/DIV
3V/DC
VOUT
2mV/DIV/AC
2.5V/DC
6654 G23
CLOAD = 1µF 50µs/DIV
IOUT
0mA
VOUT
20mV/DIV/AC
2.5V/DC
6654 G24
CLOAD = 1µF
5mA
DISTRIBUTION (ppm)
150
0
NUMBER OF UNITS
4
8
12
16
20
24
28
32
36
40
44
48
100125
–50–75
6654 G25
–25 0 25 100 125 15050 75
MAX AVG HOT CYCLE
25°C TO 125°C TO 25°C
MAX AVG COLD CYCLE
25°C TO –40°C TO 25°C
TIME (HOURS)
0400 800 16001200
–150
–120
–90
–60
0
–30
120
OUTPUT VOLTAGE CHANGE (ppm)
150
60
30
90
6654 G26
2000
TA = 35°C
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.
DISTRIBUTION (ppm)
0
NUMBER OF UNITS
3
2
1
5
4
625°C TO –40°C TO 25°C
AND 25°C TO 125°C TO 25°C
40 –30
–20 –10 0 10
6654 G37
20 30 40
LT6654
10
6654fh
For more information www.linear.com/LT6654
Typical perForMance characTerisTics
5V Load Regulation (Sourcing)
5V Load Regulation (Sinking) 5V Output Noise 0.1Hz to 10Hz
5V Minimum VIN to VOUT
Differential (Sourcing)
5V Output Voltage Temperature
Drift
5V Turn-On Characteristics
5V Output Impedance
vs Frequency
TEMPERATURE (°C)
–60 080604020–40 –20 120100
4.993
4.994
4.995
4.996
4.998
4.997
5.002
REFERENCE VOLTAGE (V)
5.003
5.000
4.999
5.001
6654 G28
140
THREE TYPICAL PARTS
50µs/DIV
GND
GND
VOUT
2V/DIV
VIN
2V/DIV
6654 G29
CLOAD = 1µF OUTPUT CURRENT (mA)
0.1 1
–20
10
0
OUTPUT VOLTAGE CHANGE (ppm)
50
40
30
20
6654 G31
10
–10
125°C
–40°C
25°C
–55°C
OUTPUT CURRENT (mA)
0.1 1
0
60
40
OUTPUT VOLTAGE CHANGE (ppm)
220
120
100
80
140
200
180
160
6654 G32
10
20
–55°C
25°C
–40°C
125°C
OUTPUT NOISE (4µV/DIV)
TIME (1s/DIV)
6654 G33
109876543210
INPUT-OUTPUT VOLTAGE (mV)
050 100 150 200 250 300 350
0.1
OUTPUT CURRENT (mA)
1
10
6654 G34
400
125°C
–40°C
–55°C 25°C
FREQUENCY (kHz)
0.1 110 100
0.01
0.1
1
10
OUTPUT IMPEDANCE (Ω)
100
6654 G30
1000
CL = 10µF
CL = 1µF
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.
2.5V Load Transient Response
(Sinking)
50µs/DIV
0mA
VOUT
20mV/DIV/AC
2.5V/DC
6654 G27
CLOAD = 1µF
IOUT
5mA
2.5V Long Term Drift (LS8)
TIME (HOURS)
0
PPM
150
–90
–60
–30
30
60
90
120
0
–150
–120
1000500
6654 G38
20001500
LT6654
11
6654fh
For more information www.linear.com/LT6654
5V Minimum VIN to VOUT
Differential (Sinking)
5V Output Voltage Noise
Spectrum
INPUT-OUTPUT VOLTAGE (mV)
–300 –250 –200 –150 –100 –50 050
0.1
OUTPUT CURRENT (mA)
1
10
6654 G35
100
25°C
55°C
–40°C
125°C
FREQUENCY (kHz)
0.01 0.1 110
0
50
100
150
250
300
350
NOISE VOLTAGE (nV√Hz)
200
450
500
550
400
600
6654 G36
100
IO = 5mA
IO = 0µA
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.
pin FuncTions
DNC (Pins 1, 7): Do Not Connect. Keep leakage current
from this pin to VIN or GND to a minimum.
NC (Pin 2): Not internally connected. May be tied to VIN,
VOUT, GND or floated.
GND (Pin 3): Internal Function. This pin must be tied to
GND near Pin 4.
GND (Pin 4): Primary Device Ground. Pin 3 and the load
ground should be star-connected to Pin 4.
VOUT (Pin 5): VOUT Pin. An output capacitor of 1µF or
greater is required for stable operation.
VOUT (Pin 6): VOUT Pin. Tie to Pin 5 for proper load regu-
lation.
VIN (Pin 8): Power Supply. Bypass VIN with a 0.1µF, or
larger, capacitor to GND.
GND (Pin 1): Internal Function. This pin must be tied to
ground, near Pin 2.
GND (Pin 2): Primary Device Ground.
DNC (Pin 3): Do Not Connect. Keep leakage current from
this pin to VIN or GND to a minimum.
VIN (Pin 4): Power Supply. Bypass VIN with a 0.1µF
capacitor to ground.
DNC (Pin 5): Do Not Connect. Keep leakage current from
this pin to VIN or GND to a minimum.
VOUT (Pin 6): Output Voltage. An output capacitor of 1µF
minimum is required for stable operation.
(LS8) (TSOT)
Typical perForMance characTerisTics
LT6654
12
6654fh
For more information www.linear.com/LT6654
block DiagraMs
+VOUT 6
4
6654 BD
BANDGAP
VIN
3
5
DNC
DNC
GND GND
21
+VOUT
VOUT
5
6
8
6654 BDa
BANDGAP
VIN
7
1
DNC
DNC
GND
NC
GND
34
2
SOT23
LS8
LT6654
13
6654fh
For more information www.linear.com/LT6654
Bypass and Load Capacitors
The LT6654 voltage references should have an input by-
pass capacitor of 0.1µF or larger, however the bypassing
on other components nearby is sufficient. In high voltage
applications, VIN > 30V, an output short-circuit to ground
can create an input voltage transient that could exceed the
maximum input voltage rating. To prevent this worst-case
condition, an RC input line filter of 10µs (i.e. 10Ω and 1µF)
is recommended. These references also require an output
capacitor for stability. The optimum output capacitance for
most applications is 1µF, although larger values work as
well. This capacitor affects the turn-on and settling time
for the output to reach its final value.
Figure 1 shows the turn-on time for the LT6654-2.5 with a
0.1µF input bypass and 1µF load capacitor. Figure 2 shows
the output response to a 0.5V transient on VIN with the
same capacitors.
The test circuit of Figure 3 is used to measure the stability
with various load currents. With RL = 1k, the 1V step pro-
duces a current step of 1mA. Figure 4 shows the response
to a ±0.5mA load. Figure 5 is the output response to a
sourcing step from 4mA to 5mA, and Figure 6 is the output
response of a sinking step from 4mA to 5mA.
applicaTions inForMaTion
Figure 1. Turn-On Characteristics of LT6654-2.5
LT6654-2.5
CIN
0.1µF
VIN
3V
CL
F VGEN
1k
6654 F03
1V
OUTIN
GND
Figure 2. Output Response to 0.5V Ripple on VIN
Figure 3. Load Current Response Time Test Circuit
20µs/DIV
GND
GND
VIN
1V/DIV
VOUT
1V/DIV
6654 F01
CLOAD = 1µF
50µs/DIV
VIN
0.5V/DIV
3V/DC
VOUT
2mV/DIV/AC
2.5V/DC
6654 F02
CLOAD = 1µF
LT6654
14
6654fh
For more information www.linear.com/LT6654
Figure 4. LT6654-2.5 Sourcing and Sinking 0.5mA
Figure 5. LT6654-2.5 Sourcing 4mA to 5mA
Figure 6. LT6654-2.5 Sinking 4mA to 5mA
50µs/DIV
IOUT
–0.5mA
VOUT
20mV/DIV/AC
2.5V/DC
6654 F04
CLOAD = 1µF
0.5mA
applicaTions inForMaTion
50µs/DIV
IOUT
4mA
VOUT
10mV/DIV/AC
2.5V/DC
6654 F05
CLOAD = 1µF
5mA
50µs/DIV
IOUT
–5mA
VOUT
10mV/DIV/AC
2.5V/DC
6654 F06
CLOAD = 1µF
–4mA
Positive or Negative Operation
In addition to the series connection, as shown on the front
page of this data sheet, the LT6654 can be operated as a
negative voltage reference.
The circuit in Figure 7 shows an LT6654 configured for
negative operation. In this configuration, a positive volt-
age is required at VIN (Pin 4) to bias the LT6654 internal
circuitry. This voltage must be current limited with R1 to
keep the output PNP transistor from turning on and driv-
ing the grounded output. C1 provides stability during load
transients. This connection maintains the same accuracy and
temperature coefficient of the positive connected LT6654.
Figure 7. Using the LT6654-2.5 to Build a –2.5V Reference
LT6654-2.5
VEE
VOUT = –2.5V
0.1µF
3V
R1
4.7k
6654 F07
C1
F
VEE – VOUT
550µA + IOUT
R ≤
OUT
IN
GND
LT6654
15
6654fh
For more information www.linear.com/LT6654
applicaTions inForMaTion
similar to a real world application. The boards were then
placed into a constant temperature oven with TA = 35°C,
their outputs scanned regularly and measured with an 8.5
digit DVM. Long-term drift curves are shown in Figure 8.
Their drift is much smaller after the first thousand hours.
Long-Term Drift
Long-term drift cannot be extrapolated from accelerated
high temperature testing. This erroneous technique
gives drift numbers that are wildly optimistic. The only
way long-term drift can be determined is to measure it
over the time interval of interest. The LT6654 drift data
was taken on 40 parts that were soldered into PC boards
Figure 8. LT6654-2.5 Long Term Drift
TIME (HOURS)
0200 400 800600
–80
–40
0
OUTPUT VOLTAGE CHANGE (ppm)
80
40
6654 F08a
1000
LT6654-2.5 S6 PACKAGE
FIRST THOUSAND HOURS
TIME (HOURS)
1000 1200 1400 18001600
–80
–40
0
OUTPUT VOLTAGE CHANGE (ppm)
80
40
6654 F08b
2000
LT6654-2.5 S6 PACKAGE
SECOND THOUSAND HOURS
(NORMALIZED TO THE FIRST THOUSAND HOURS)
TIME (HOURS)
0
PPM
80
–40
40
0
–80 1000500
6654 G38
20001500
LT6654-2.5 LS8 PACKAGE
LT6654
16
6654fh
For more information www.linear.com/LT6654
Figure 11a. LT6654 S6 Thermal Hysteresis –40°C to 125°C
Figure 11b. LT6654 LS8 Thermal Hysteresis –40°C to 125°C
DISTRIBUTION (ppm)
150
0
NUMBER OF UNITS
10
20
30
40
50
100
–50
6654 F11
0 100 15050
MAX AVG HOT CYCLE
25°C TO 125°C TO 25°C
MAX AVG COLD CYCLE
25°C TO –40°C TO 25°C
applicaTions inForMaTion
Figure 9. Maximum Allowed Power Dissipation of the LT6654
Figure 10. Typical Power Dissipation of the LT6654
TEMPERATURE (°C)
0
0
POWER (W)
0.1
0.2
0.6
0.5
0.4
0.3
0.7
20 40 60 80
6654 F09
100 120 140
T = 150°C
θJA = 192°C/W
130mW
VIN (V)
0
0
POWER (W)
0.05
0.25
0.20
0.15
0.10
0.40
0.35
0.30
510 15
6654 F10
20 25 30 35 40
10mA LOAD
NO LOAD
335mW
Power Dissipation
The power dissipation in the LT6654 is dependent on VIN,
load current and the package. The LT6654 package has
a thermal resistance, or θJA, of 192°C/W. A curve that
illustrates allowed power dissipation versus temperature
for the 6-lead SOT-23 package is shown in Figure 9. The
power dissipation of the LT6654-2.5 as a function of input
voltage is shown in Figure 10. The top curve shows power
dissipation with a 10mA load and the bottom curve shows
power dissipation with no load. When operated within
its specified limits of VIN = 36V and sourcing 10mA, the
LT6654-2.5 consumes about 335mW at room temperature.
The power-derating curve in Figure 9 shows the LT6654-
2.5 can only safely dissipate 130mW at 125°C, which is
less than its maximum power output. Care must be taken
when designing the circuit so that the maximum junction
temperature is not exceeded. For best performance, junc-
tion temperature should be kept below 125°C.
The LT6654 includes output current limit circuitry, as well
as thermal limit circuitry, to protect the reference from
damage in the event of excessive power dissipation. The
LT6654 is protected from damage by a thermal shutdown
circuit. However, changes in performance may occur as a
result of operation at high temperature.
6654 F11b
DISTRIBUTION (ppm)
0
NUMBER OF UNITS
3
2
1
5
4
625°C TO –40°C TO 25°C
AND 25°C TO 125°C TO 25°C
40 –30
–20 –10 0 10
20 30 40
LT6654
17
6654fh
For more information www.linear.com/LT6654
applicaTions inForMaTion
Hysteresis
The hysteresis data is shown in Figure 11. The LT6654 is
capable of dissipating relatively high power. For example,
with a 36V input voltage and 10mA load current applied
to the LT6654-2.5, the power dissipation is PD = 33.5V
10mA = 335mW, which causes an increase in the die
temperature of 64°C. This could increase the junction
temperature above 125°C (TJMAX is 150°C) and may cause
the output to shift due to thermal hysteresis.
PC Board Layout
The mechanical stress of soldering a surface mount volt-
age reference to a PC board can cause the output voltage
to shift and temperature coefficient to change. These two
changes are not correlated. For example, the voltage may
shift but the temperature coefficient may not.
To reduce the effects of stress-related shifts, mount the
reference near the short edge of the PC board or in a
corner. In addition, slots can be cut into the board on two
sides of the device.
The capacitors should be mounted close to the LT6654.
The GND and VOUT traces should be as short as possible
to minimize I R drops, since high trace resistance directly
impacts load regulation.
IR Reflow Shift
The different expansion and contraction rates of the ma-
terials that make up the LT6654 package may cause the
output voltage to shift after undergoing IR reflow. Lead free
solder reflow profiles reach over 250°C, considerably more
than with lead based solder. A typical lead free IR reflow
profile is shown in Figure 12. Similar profiles are found
using a convection reflow oven. LT6654 devices run up
to three times through this reflow process show that the
standard deviation of the output voltage increases with a
slight negative mean shift of 0.003% as shown in Figure 13.
While there can be up to 0.014% of output voltage shift,
the overall drift of the LT6654 after IR reflow does not
vary significantly.
Figure 12. Lead Free Reflow Profile
MINUTES
TEMPERATURE (°C)
0
0
75
RAMP
DOWN
tP
30s
40s
tL
130s
120s
150
225
300
2 4 6 8
6654 F12
10
RAMP TO
150°C
380s TP = 260°C
TL = 217°C
TS(MAX) = 200°C
TS = 190°C
T = 150°C
Figure 13. Output Voltage Shift Due to IR Reflow (%)
CHANGE IN OUTPUT (ppm)
–140
0
NUMBER OF UNITS
2
4
6
8
10
12
14
–120 –100 –80
–60
6654 F13
–40 0–20
260°C 3 CYCLES
260°C 1 CYCLE
LT6654S6
Humidity Sensitivity
Plastic mould compounds absorb water. With changes in
relative humidity, plastic packaging materials change the
amount of pressure they apply to the die inside, which
can cause slight changes in the output of a voltage refer-
ence, usually on the order of 100ppm. The LS8 package is
hermetic, so it is not affected by humidity, and is therefore
more stable in environments where humidity may be a
concern.
LT6654
18
6654fh
For more information www.linear.com/LT6654
LT6654-2.5
2N2905
220Ω
IN
OUT
4.7µF
6654 TA03
F
IOUT
UP TO 300mA
4.5V < VIN < 36V
GND
Boosted Output Current ReferenceExtended Supply Range Reference
Boosted Output Current with Current Limit
1
2
LED1*
*LED CANNOT BE OMMITTED
THE LED CLAMPS THE VOLTAGE
DROP ACROSS THE 220Ω AND
LIMITS OUTPUT CURRENT
6654 TA04
220Ω 4.7µF
F
IOUT
UP TO 100mA
10Ω
2N2905
4.5V < VIN < 36V
LT6654-2.5
IN OUT
GND
Octal DAC Reference
Typical applicaTions
LT6654-2.5
BZX84C12
330k
UP TO 160V
MMBT5551
6654 TA02
F
0.1µF OUT
IN
GND
2.65V < VIN < 5V
6654 TA05
0.1µF 10µF
VREF VCC
CS
DAC E
DAC A
DAC B
DAC C
DAC D
DAC F
DAC G
GND DAC H
LTC2600
SCK
SDI
CLEAR
VIN
0.1µF
LT6654-2.5
IN OUT
GND
LT6654
19
6654fh
For more information www.linear.com/LT6654
package DescripTion
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45
6 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3) S6 TSOT-23 0302
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX 0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
PIN ONE ID
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
Please refer to http://www.linear.com/product/LT6654#packaging for the most recent package drawings.
LT6654
20
6654fh
For more information www.linear.com/LT6654
package DescripTion
7
8
1
3
4
2
2.00 REF
R0.20 REF
6
5
7
8
6
5
1
2
3
4
4.20 ±0.10
4.20 SQ ±0.10
2.54 ±0.15
1.00 ×
7 TYP
0.64 × 8 TYP
LS8 0113 REV B
R0.20 REF
0.95 ±0.10
1.45 ±0.10
0.10 TYP0.70 TYP
1
4
7
8
6
1.4
0.5
1.50 ±0.15
2.50 ±0.15
2.54 ±0.15
0.70 ±0.05 × 8
PACKAGE OUTLINE
0.5
5.00 SQ ±0.15
5.00 SQ ±0.15
5.00 SQ ±0.15
5.80 SQ ±0.15
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
NOTE:
1. ALL DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS PACKAGE DO NOT INCLUDE PLATING BURRS
PLATING BURRS, IF PRESENT, SHALL NOT EXCEED 0.30mm ON ANY SIDE
4. PLATING—ELECTO NICKEL MIN 1.25UM, ELECTRO GOLD MIN 0.30UM
5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
PIN 1
TOP MARK
(SEE NOTE 5)
2
3
LS8 Package
8-Pin Leadless Chip Carrier (5mm × 5mm)
(Reference LTC DWG # 05-08-1852 Rev B)
ABCDEF
XYY ZZ
e4
Q12345
TRAY PIN 1
BEVEL PACKAGE IN TRAY LOADING ORIENTATION
COMPONENT
PIN “A1
1.4
Please refer to http://www.linear.com/product/LT6654#packaging for the most recent package drawings.
LT6654
21
6654fh
For more information www.linear.com/LT6654
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
A 12/10 Added voltage options (1.250V, 2.048V, 3.000V, 4.096V, 5.000V) reflected throughout the data sheet. 1-18
B 3/11 Revised conditions for Output Voltage Noise in the Electrical Characteristics section. 4
C 8/12 Addition of LS8 Features and Order Information.
Update to Electrical Characteristics to Include LS8 Package.
Addition of Long Term Drift and Hysteresis Plots for LS8 Package.
Addition of Humidity Sensitivity Information.
Addition of LS8 Package Description.
Addition of Related Parts.
1, 2, 4
6
9, 15, 16
17
20
22
D 2/14 Schematics updated to refer to pin functions instead of pin numbers.
Label of Pin 2 on LS8 package changed to NC.
The pin descriptions of Pin 2, Pin 3 and Pin 4 on LS8 package changed.
GND label added on all schematic references of LT6654.
1, 13, 14, 18
2, 11, 12
11
18, 22
E 6/15 SOT-23 removed from data sheet title.
Order Information updated to include 2.048V, 4.096V and 5V option in LS8 package.
1
3, 4
F 12/15 Part marking correction for 4.096V options in TSOT-23 package.
Web link to Package Description updated.
3
19, 20
G 03/17 Added 2.5V option in I-temp grade. 2-5
H 05/17 Added 1.25V, 2.048V, 3V, 3.3V, 4.096V and 5V Option in I-temp grade. 2-5
LT6654
22
6654fh
For more information www.linear.com/LT6654
LINEAR TECHNOLOGY CORPORATION 2010
LT 0517 REV H • PRINTED IN USA
www.linear.com/LT6654
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT1460 Micropower Series Reference 0.075% Max, 10ppm/°C Max Drift, 2.5V, 5V and 10V Versions, MSOP, PDIP, S0-8,
SOT-23 and TO-92 Packages
LT1461 Micropower Precision LDO Series Reference 3ppm/°C Max Drift, 0°C to 70°C, –40°C to 85°C, –40°C to 125°C Options in SO-8
LT1790 Micropower Precision Series References 0.05% Max, 10ppm/°C Max, 60µA Supply, SOT-23 Package
LT6650 Micropower Reference with Buffer Amplifier 0.05% Max, 5.6µA Supply, SOT-23 Package
LTC6652 Precision Low Drift Low Noise Buffered
Reference
0.5% Max, 5ppm/°C Max, 2.1ppmP-P Noise (0.1Hz to 10Hz) 100% Tested at –40°C,
25°C and 125°C
LT6660 Tiny Micropower Series Reference 0.2% Max, 20ppm/°C Max, 20mA Output Current, 2mm × 2mm DFN
LTC6655 Precision Low Noise Reference 2ppm/°C Max, 650nVP-P Noise (0.1Hz to 10Hz) 100% Tested at –40°C, 25°C and 125°C
LT6656 800nA Precision Voltage Reference 800nA, 10ppm/°C Max, 0.05% Max, SOT-23 Package
16-Bit ADC Reference
6654 TA06
SDO
SDI
fO
GND SCK
CS
IN+
IN–
+
VCC
VREF
4.6V < VS < 36V
LT6654-4.096
LTC2480 TO MCU–2.048V < VDIFFERENTIAL < 2.048V
IN OUT
0.1µF 10µF
GND

Products

IC VREF SERIES 0.1% TSOT-23-6
Available Quantity13601
Unit Price6.1
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity5390
Unit Price6.1
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity3108
Unit Price6.1
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity2635
Unit Price6.1
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity940
Unit Price6.1
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity5201
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity5791
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity2528
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity2928
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity1108
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity1228
Unit Price10.37
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity3290
Unit Price25.67
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity541
Unit Price25.67
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity1278
Unit Price25.67
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity644
Unit Price5.51
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity1259
Unit Price6.1
IC VREF SERIES 0.1% TSOT-23-6
Available Quantity996
Unit Price6.1
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity614
Unit Price9.41
IC VREF SERIES 0.05% TSOT-23-6
Available Quantity542
Unit Price9.41
IC VREF SERIES 0.05% 8CLCC
Available Quantity247
Unit Price12.56