FEATURES
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LT6656
1µA Precision Series
Voltage Reference
DESCRIPTION
The
LT
®
6656
is a tiny precision voltage reference that
draws less than 1µA of supply current and can operate
with a supply voltage within 10mV of the output voltage.
The LT6656 offers an initial accuracy of 0.05% and tem-
perature drift of 10ppm/°C. The combined low power and
precision characteristics are ideal for portable and battery
powered instrumentation.
The LT6656 can supply up to 5mA of output drive with
65ppm/mA of load regulation, allowing it to be used as
the supply voltage and the reference input to a low power
ADC. The LT6656 can accept a supply voltage up to 18V
and withstand the reversal of the input connections.
The LT6656 output is stable with 1µF or larger output
capacitance and operates with a wide range of output
capacitor ESR.
This reference is fully specified for operation from –40°C
to 85°C, and is functional over the extreme temperature
range of –55°C to 125°C. Low hysteresis and a consistent
temperature drift are obtained through advanced design,
processing and packaging techniques.
The LT6656 is offered in the 6-lead SOT-23, (2mm
×
2mm) DFN, and 8-lead LS8 Packages. The LS8 is a 5mm
×
5mm surface mount hermetic package that provides
outstanding stability.
All registered trademarks and trademarks are the property of their respective owners.
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Ultralow Supply Current: 850nA
Low Drift
A Grade: 10 ppm/°C Max
B Grade: 20 ppm/°C Max
High Accuracy
A Grade: 0.05% Max
B Grade: 0.1% Max
Long-Term Drift: 15ppm/√kHr (LS8 Package)
No Humidity Sensitivity (LS8 Package)
High Output Drive Current: 5mA Min
Low Dropout Voltage: 10mV Max
Fully Specified from –40°C to 85°C
Operational from –55°C to 125°C
Wide Supply Range to 18V
Reverse Input/Output Protection
Available Output Voltage Options:
1.25V, 2.048V, 2.5V, 2.8V, 3V, 3.3V, 4.096V and 5V
Available in Low Profile (1mm) ThinSOT™,
(2mm
×
2mm) DFN and High Stability Hermetic
(5mm
×
5mm) LS8 Packages
APPLICATIONS
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Precision A/D and D/A Converters
Portable Gas Monitors
Battery- or Solar-Powered Systems
Precision Regulators
Low Voltage Signal Processing
Micropower Remote Sensing
TYPICAL APPLICATION
Basic Connection
2.51V ≤ V
IN
≤ 18V
0.1µF
V
IN
LT6656-2.5
V
OUT
GND
V
OUT
2.5V
1µF
6656 TA01a
Output Voltage Temperature Drift
2.503
38 TYPICAL UNITS
LT6656-2.5
2.502
V
OUT
(V)
2.501
2.500
2.499
2.498
–40
–20
0
20
40
TEMPERATURE (°C)
60
80
6652 TA01b
Document Feedback
For more information
www.analog.com
1
Rev D
LT6656
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage...........................................................±20V
Output Voltage ........................................... –0.3V to 20V
Output Voltage Above Input Voltage .........................20V
Specified Temperature Range (Note 2)
Commercial ............................................. 0°C to 70°C
Industrial .............................................–40°C to 85°C
Operating Temperature Range (Note 2).. –55°C to 125°C
Output Short Circuit Duration ......................... Indefinite
Junction Temperature .......................................... 150°C
Storage Temperature Range (Note 3)..... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)
TSOT-23 (Note 4) .............................................. 300°C
PIN CONFIGURATION
TOP VIEW
GND* 1
GND 2
NC 3
6 V
OUT
5 NC
4 V
IN
NC 1
GND 2
GND* 3
7
GND*
TOP VIEW
6 V
IN
5 NC
4 V
OUT
NC
NC
GND*
1
2
3
4
TOP VIEW
V
IN
8
7
6
5
NC
V
OUT
V
OUT
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 230°C/W
*CONNECT PIN TO DEVICE GND (PIN 2)
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 102°C/W
EXPOSED PAD (PIN 7) MUST BE CONNECTED TO GND
GND
LS8 PACKAGE
8-PIN LEADLESS CHIP CARRIER (5mm × 5mm)
T
JMAX
= 150°C,
θ
JA
= 125°C/W
*CONNECT PIN TO DEVICE GND (PIN 4)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL (MINI)
LT6656ACS6-1.25#TRMPBF
LT6656BCS6-1.25#TRMPBF
LT6656AIS6-1.25#TRMPBF
LT6656BIS6-1.25#TRMPBF
LT6656ACS6-2.048#TRMPBF
LT6656BCS6-2.048#TRMPBF
LT6656AIS6-2.048#TRMPBF
LT6656BIS6-2.048#TRMPBF
LT6656ACS6-2.5#TRMPBF
LT6656BCS6-2.5#TRMPBF
LT6656AIS6-2.5#TRMPBF
LT6656BIS6-2.5#TRMPBF
LT6656ACS6-3#TRMPBF
LT6656BCS6-3#TRMPBF
LT6656AIS6-3#TRMPBF
LT6656BIS6-3#TRMPBF
LT6656ACS6-3.3#TRMPBF
LT6656BCS6-3.3#TRMPBF
LT6656AIS6-3.3#TRMPBF
LT6656BIS6-3.3#TRMPBF
TAPE AND REEL
LT6656ACS6-1.25#TRPBF
LT6656BCS6-1.25#TRPBF
LT6656AIS6-1.25#TRPBF
LT6656BIS6-1.25#TRPBF
LT6656ACS6-2.048#TRPBF
LT6656BCS6-2.048#TRPBF
LT6656AIS6-2.048#TRPBF
LT6656BIS6-2.048#TRPBF
LT6656ACS6-2.5#TRPBF
LT6656BCS6-2.5#TRPBF
LT6656AIS6-2.5#TRPBF
LT6656BIS6-2.5#TRPBF
LT6656ACS6-3#TRPBF
LT6656BCS6-3#TRPBF
LT6656AIS6-3#TRPBF
LT6656BIS6-3#TRPBF
LT6656ACS6-3.3#TRPBF
LT6656BCS6-3.3#TRPBF
LT6656AIS6-3.3#TRPBF
LT6656BIS6-3.3#TRPBF
PART MARKING*
LTFNK
LTFNK
LTFNK
LTFNK
LTFNN
LTFNN
LTFNN
LTFNN
LTFGW
LTFGW
LTFGW
LTFGW
LTFNQ
LTFNQ
LTFNQ
LTFNQ
LTFNS
LTFNS
LTFNS
LTFNS
PACKAGE DESCRIPTION
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
Rev D
2
For more information
www.analog.com
LT6656
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL (MINI)
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
LT6656ACS6-4.096#TRMPBF LT6656ACS6-4.096#TRPBF LTFNV
6-Lead Plastic TSOT-23
LT6656BCS6-4.096#TRMPBF LT6656BCS6-4.096#TRPBF LTFNV
6-Lead Plastic TSOT-23
LT6656AIS6-4.096#TRMPBF LT6656AIS6-4.096#TRPBF LTFNV
6-Lead Plastic TSOT-23
LT6656BIS6-4.096#TRMPBF LT6656BIS6-4.096#TRPBF LTFNV
6-Lead Plastic TSOT-23
LT6656ACS6-5#TRMPBF
LT6656ACS6-5#TRPBF
LTFNX
6-Lead Plastic TSOT-23
LT6656BCS6-5#TRMPBF
LT6656BCS6-5#TRPBF
LTFNX
6-Lead Plastic TSOT-23
LT6656AIS6-5#TRMPBF
LT6656AIS6-5#TRPBF
LTFNX
6-Lead Plastic TSOT-23
LT6656BIS6-5#TRMPBF
LT6656BIS6-5#TRPBF
LTFNX
6-Lead Plastic TSOT-23
LT6656ACDC-1.25#TRMPBF LT6656ACDC-1.25#TRPBF LFNM
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-1.25#TRMPBF LT6656BCDC-1.25#TRPBF LFNM
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-1.25#TRMPBF LT6656AIDC-1.25#TRPBF
LFNM
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-1.25#TRMPBF LT6656BIDC-1.25#TRPBF
LFNM
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-2.048#TRMPBF LT6656ACDC-2.048#TRPBF LFNP
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-2.048#TRMPBF LT6656BCDC-2.048#TRPBF LFNP
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-2.048#TRMPBF LT6656AIDC-2.048#TRPBF LFNP
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-2.048#TRMPBF LT6656BIDC-2.048#TRPBF LFNP
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-2.5#TRMPBF
LT6656ACDC-2.5#TRPBF
LFGX
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-2.5#TRMPBF
LT6656BCDC-2.5#TRPBF
LFGX
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-2.5#TRMPBF
LT6656AIDC-2.5#TRPBF
LFGX
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-2.5#TRMPBF
LT6656BIDC-2.5#TRPBF
LFGX
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-2.8#TRMPBF
LT6656AIDC-2.8#TRPBF
LHQX
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-3#TRMPBF
LT6656ACDC-3#TRPBF
LFNR
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-3#TRMPBF
LT6656BCDC-3#TRPBF
LFNR
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-3#TRMPBF
LT6656AIDC-3#TRPBF
LFNR
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-3#TRMPBF
LT6656BIDC-3#TRPBF
LFNR
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-3.3#TRMPBF
LT6656ACDC-3.3#TRPBF
LFNT
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-3.3#TRMPBF
LT6656BCDC-3.3#TRPBF
LFNT
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-3.3#TRMPBF
LT6656AIDC-3.3#TRPBF
LFNT
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-3.3#TRMPBF
LT6656BIDC-3.3#TRPBF
LFNT
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-4.096#TRMPBF LT6656ACDC-4.096#TRPBF LFNW
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-4.096#TRMPBF LT6656BCDC-4.096#TRPBF LFNW
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-4.096#TRMPBF LT6656AIDC-4.096#TRPBF LFNW
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-4.096#TRMPBF LT6656BIDC-4.096#TRPBF LFNW
6-Lead (2mm
×
2mm) Plastic DFN
LT6656ACDC-5#TRMPBF
LT6656ACDC-5#TRPBF
LFNY
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BCDC-5#TRMPBF
LT6656BCDC-5#TRPBF
LFNY
6-Lead (2mm
×
2mm) Plastic DFN
LT6656AIDC-5#TRMPBF
LT6656AIDC-5#TRPBF
LFNY
6-Lead (2mm
×
2mm) Plastic DFN
LT6656BIDC-5#TRMPBF
LT6656BIDC-5#TRPBF
LFNY
6-Lead (2mm
×
2mm) Plastic DFN
LEAD FREE FINISH
PART MARKING*
PACKAGE DESCRIPTION
LT6656AILS8-1.25#PBF
†
656125
8-Lead (5mm
×
5mm) Ceramic LCC
†
LT6656BILS8-1.25#PBF
656125
8-Lead (5mm
×
5mm) Ceramic LCC
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Contact the factory for parts specified with wider operating temperature ranges.
Contact the factory for information on lead based finish parts.
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
SPECIFIED TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Tape and reel specifications.
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
www.analog.com
3
Rev D
LT6656
AVAILABLE OPTIONS
SPECIFIED TEMPERATURE RANGE
OUTPUT VOLTAGE
1.250V
INITIAL ACCURACY
0.05%
0.05%
0.10%
0.10%
0.10%
0.20%
2.048V
0.05%
0.10%
0.10%
0.20%
2.500V
0.05%
0.10%
0.10%
0.20%
2.800V
3.000V
0.10%
0.05%
0.10%
0.10%
0.20%
3.300V
0.05%
0.10%
0.10%
0.20%
4.096V
0.05%
0.10%
0.10%
0.20%
5.000V
0.05%
0.10%
0.10%
0.20%
*See Order Information section for complete part number listing.
TEMPERATURE
COEFFICIENT
10ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
15ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
10ppm/°C
20ppm/°C
0°C TO 70°C
ORDER PART NUMBER*
LT6656ACS6-1.25
N/A
LT6656BCS6-1.25
LT6656ACDC-1.25
N/A
LT6656BCDC-1.25
LT6656ACS6-2.048
LT6656BCS6-2.048
LT6656ACDC-2.048
LT6656BCDC-2.048
LT6656ACS6-2.5
LT6656BCS6-2.5
LT6656ACDC-2.5
LT6656BCDC-2.5
N/A
LT6656ACS6-3
LT6656BCS6-3
LT6656ACDC-3
LT6656BCDC-3
LT6656ACS6-3.3
LT6656BCS6-3.3
LT6656ACDC-3.3
LT6656BCDC-3.3
LT6656ACS6-4.096
LT6656BCS6-4.096
LT6656ACDC-4.096
LT6656BCDC-4.096
LT6656ACS6-5
LT6656BCS6-5
LT6656ACDC-5
LT6656BCDC-5
–40°C TO 85°C
ORDER PART NUMBER*
LT6656AIS6-1.25
LT6656AILS8-1.25
LT6656BIS6-1.25
LT6656AIDC-1.25
LT6656BILS8-1.25
LT6656BIDC-1.25
LT6656AIS6-2.048
LT6656BIS6-2.048
LT6656AIDC-2.048
LT6656BIDC-2.048
LT6656AIS6-2.5
LT6656BIS6-2.5
LT6656AIDC-2.5
LT6656BIDC-2.5
LT6656AIDC-2.8
LT6656AIS6-3
LT6656BIS6-3
LT6656AIDC-3
LT6656BIDC-3
LT6656AIS6-3.3
LT6656BIS6-3.3
LT6656AIDC-3.3
LT6656BIDC-3.3
LT6656AIS6-4.096
LT6656BIS6-4.096
LT6656AIDC-4.096
LT6656BIDC-4.096
LT6656AIS6-5
LT6656BIS6-5
LT6656AIDC-5
LT6656BIDC-5
4
Rev D
For more information
www.analog.com
LT6656
The
l
denotes the specifications which apply over the specified
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
+ 0.5V (for LT6656-1.25, V
IN
= 2.2V), C
L
= 1μF, I
L
= 0,unless
otherwise noted.
PARAMETER
Output Voltage Error
CONDITIONS
LT6656ACS6, LT6656AIS6,
LT6656AILS8
LT6656BCS6, LT6656BIS6,
LT6656BILS8
LT6656ACDC, LT6656AIDC
LT6656BCDC, LT6656BIDC
LT6656A
LT6656B
V
IN
= (V
OUT
+ 0.5V) to 18V
LT6656-2.048, LT6656-2.5, LT6656-2.8,
LT6656-3, LT6656-3.3, LT6656-4.096,
LT6656-5
V
IN
= 2.2V to 18V
LT6656-1.25
Load Regulation (Note 6)
I
L
= 5mA, Sourcing
LT6656-2.048, LT6656-2.5, LT6656-2.8,
LT6656-3, LT6656-3.3, LT6656-4.096,
LT6656-5
I
L
= 5mA, Sourcing
LT6656S6-1.25, LT6656DC-1.25
I
L
= 5mA, Sourcing
LT6656LS8-1.25
Dropout Voltage (Note 7)
V
IN
– V
OUT
, ∆V
OUT
Error ≤ 0.1%
I
L
= 0
LT6656-2.048, LT6656-2.5, LT6656-2.8,
LT6656-3, LT6656-3.3, LT6656-4.096,
LT6656-5
I
L
= 5mA, Sourcing
LT6656-2.048, LT6656-2.5, LT6656-2.8,
LT6656-3, LT6656-3.3, LT6656-4.096,
LT6656-5
Minimum Input Voltage
I
L
= 0, ∆V
OUT
Error ≤ 0.1%
LT6656-1.25
0°C ≤ T
A
≤ 70°C
–40°C ≤ T
A
≤ 85°C
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
–0.05
–0.1
–0.1
–0.2
TYP
MAX
0.05
0.1
0.1
0.2
UNITS
%
%
%
%
Output Voltage Temperature Coefficient (Note 5)
Line Regulation
5
12
2
10
20
25
40
ppm/°C
ppm/°C
ppm/V
ppm/V
2
l
25
40
150
375
ppm/V
ppm/V
ppm/mA
ppm/mA
65
l
80
l
175
425
250
500
10
40
ppm/mA
ppm/mA
ppm/mA
ppm/mA
mV
mV
135
l
3
l
250
l
370
500
mV
mV
1.35
l
l
1.5
1.6
1.8
1.0
1.5
V
V
V
µA
µA
mA
mA
µA
µA
ppm
P-P
µV
RMS
µV
RMS
µV
RMS
ms
ms
ms
Supply Current
l
0.85
Short V
OUT
to GND
Short V
OUT
to V
IN
V
IN
= –18V, V
OUT
= GND
V
IN
= GND, V
OUT
= 18V
0.1Hz to 10Hz
10Hz to 1kHz, LT6656-1.25
10Hz to 1kHz, LT6656-2.5
10Hz to 1kHz, LT6656-5
LT6656-1.25, 0.1% Settling
LT6656-2.5, 0.1% Settling
LT6656-5, 0.1% Settling
18
4
80
30
30
50
80
140
15
30
60
Output Short Circuit Current
Input Reverse Leakage Current
Reverse Output Current
Output Voltage Noise (Note 8)
Turn-On Time
For more information
www.analog.com
5
Rev D
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