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.
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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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, 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
6656fc
For more information
www.linear.com/LT6656
1
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
TOP VIEW
GND* 1
GND 2
NC 3
6 V
OUT
5 NC
4 V
IN
NC 1
GND 2
GND* 3
7
GND*
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
6656fc
2
For more information
www.linear.com/LT6656
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
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.
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/
†
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
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
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
6656fc
For more information
www.linear.com/LT6656
3
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%
3.000V
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
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
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
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
6656fc
4
For more information
www.linear.com/LT6656
LT6656
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage Error
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.
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, LT6656-3,
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, LT6656-3,
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, LT6656-3,
LT6656-3.3, LT6656-4.096, LT6656-5
I
L
= 5mA, Sourcing
LT6656-2.048, LT6656-2.5, 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
MIN
–0.05
–0.1
–0.1
–0.2
TYP
MAX
0.05
0.1
0.1
0.2
UNITS
%
%
%
%
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
mV
mV
mV
mV
Output Voltage Temperature Coefficient (Note 5)
Line Regulation
5
12
2
10
20
25
40
25
40
150
375
175
425
250
500
10
40
370
500
2
l
65
l
80
l
135
l
3
l
250
l
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
ppm/√kHr
ppm/√kHr
ppm
ppm
ppm
ppm
6656fc
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
LT6656S6, LT6656DC
LT6656LS8
LT6656S6, LT6656DC
∆T = 0°C to 70°C
∆T = –40°C to 85°C
LT6656LS8
∆T = 0°C to 70°C
∆T = –40°C to 85°C
18
4
80
30
30
50
80
140
15
30
60
50
15
25
70
15
55
Output Short Circuit Current
Input Reverse Leakage Current
Reverse Output Current
Output Voltage Noise (Note 8)
Turn-On Time
Long Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
For more information
www.linear.com/LT6656
5
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