LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
LM185-1.2-N/LM285-1.2-N/LM385-1.2-N Micropower Voltage Reference Diode
Check for Samples: LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
FEATURES
1
•
•
•
•
•
•
2
•
±1% and 2% Initial Tolerance
Operating Current of 10μA to 20mA
1Ω Dynamic Impedance
Low Temperature Coefficient
Low Voltage Reference—1.235V
2.5V Device and Adjustable Device Also
Available
LM185-2.5 Series and LM185 Series,
respectively
DESCRIPTION
The LM185-1.2-N/LM285-1.2-N/LM385-1.2-N are
micropower 2-terminal band-gap voltage regulator
diodes. Operating over a 10μA to 20mA current
range, they feature exceptionally low dynamic
impedance and good temperature stability. On-chip
trimming is used to provide tight voltage tolerance.
Since the LM185-1.2-N band-gap reference uses only
transistors and resistors, low noise and good long
term stability result.
Careful design of the LM185-1.2-N has made the
device exceptionally tolerant of capacitive loading,
making it easy to use in almost any reference
application. The wide dynamic operating range allows
its use with widely varying supplies with excellent
regulation.
The extremely low power drain of the LM185-1.2-N
makes it useful for micropower circuitry. This voltage
reference can be used to make portable meters,
regulators or general purpose analog circuitry with
battery life approaching shelf life.
Further, the wide operating current allows it to
replace older references with a tighter tolerance part.
The LM185-1.2-N is rated for operation over a −55°C
to 125°C temperature range while the LM285-1.2-N is
rated −40°C to 85°C and the LM385-1.2-N 0°C to
70°C. The LM185-1.2-N/LM285-1.2-N are available in
a hermetic TO package and the LM285-1.2-N/LM3851.2-N are also available in a low-cost TO-92 molded
package, as well as SOIC and SOT-23.
CONNECTION DIAGRAM
Figure 1. T0-92 Package (LP)
(Bottom View)
Figure 3. SOIC Package
* Pin 3 is attached to the Die Attach Pad
(DAP) and should be connected to Pin 2 or
left floating.
Figure 2. SOT-23
Figure 4. TO Package (NDV)
(Bottom View)
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS (1) (2) (3)
Reverse Current
30mA
Forward Current
10mA
Operating Temperature Range
(4)
LM185-1.2-N
−55°C to +125°C
LM285-1.2-N
−40°C to +85°C
LM385-1.2-N
ESD Susceptibility
0°C to 70°C
(5)
2kV
−55°C to +150°C
Storage Temperature
Soldering Information
TO-92 package: 10 sec.
260°C
TO package:10 sec.
300°C
SOIC and SOT-23 Pkg.
Vapor phase (60 sec.)
215°C
Infrared (15 sec.)
220°C
See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices.
(1)
(2)
(3)
(4)
(5)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics. The specifications
apply only for the test conditions listed.
Refer to RETS185H-1.2 for military specifications.
If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
For elevated temperature operation, see Table 1.
The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Table 1. TJ(max) for Elevated Temperature Operation
2
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DEVICE
TJ(max) (°C)
LM185-1.2-N
150
LM285-1.2-N
125
LM385-1.2-N
100
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS (1)
LM185-1.2-N
Parameter
Conditions
Typ
LM185BX-1.2-N
LM385B-1.2-N
LM185BY-1.2-N
LM385BX-1.2-N
LM285-1.2-N
LM385BY-1.2-N
LM385-1.2-N
Units
(Limit)
LM285BX-1.2-N
LM285BY-1.2-N
Tested
Limit (2)
(3)
Reverse Breakdown
TA = 25°C,
Voltage
10μA ≤ IR ≤ 20mA
Minimum Operating
Current
Reverse Breakdown
Voltage Change with
Current
1.23
5
Design
Limit (4)
1.223
10
Design
Limit (4)
1.223
1.247
8
Tested
Limit (2)
1
1.5
V(Min)
1.260
15
20
LM385M3-1.2-N
10μA ≤ IR ≤ 1mA
Design
Limit (4)
1.205
1.247
20
Tested
Limit (2)
1
1.5
V(Max)
15
20
μA
10
15
(Max)
1
1.5
mV
(Max)
1mA ≤ IR ≤ 20mA
10
20
20
25
20
25
mV
(Max)
IR = 100μA, f = 20Hz
1
Ω
Wideband Noise
IR = 100μA,
60
μV
(rms)
10Hz ≤ f ≤ 10kHz
Long Term Stability
IR = 100μA, T = 1000 Hr,
20
ppm
Reverse Dynamic
Impedance
TA = 25°C ±0.1°C
Average Temperature
Coefficient
(5)
IR = 100μA
X Suffix
30
30
ppm/°C
Y Suffix
50
50
ppm/°C
All Others
150
150
150
ppm/°C
(Max)
(1)
(2)
(3)
(4)
(5)
Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C.
Production tested.
A military RETS electrical specification is available on request.
Specified by design. Not production tested. These limits are not used to calculate average outgoing quality levels.
The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between
the operating TMAX and TMIN, divided by TMAX − TMIN. The measured temperatures are −55°C, −40°C, 0°C, 25°C, 70°C, 85°C, 125°C.
THERMAL CHARACTERISTICS
Thermal Resistance
θJA (junction to ambient)
θJC (junction to case)
Copyright © 2000–2013, Texas Instruments Incorporated
TO-92
TO
SOIC
SOT-23
180°C/W (0.4″ leads)
170°C/W (0.125″ leads)
440°C/W
165°C/W
283°C/W
N/A
80°C/W
N/A
N/A
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3
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS
4
Reverse Characteristics
Reverse Characteristics
Figure 5.
Figure 6.
Forward Characteristics
Temperature Drift of 3
Representative Units
Figure 7.
Figure 8.
Reverse Dynamic Impedance
Reverse Dynamic Impedance
Figure 9.
Figure 10.
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Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Noise Voltage
Filtered Output Noise
Figure 11.
Figure 12.
Response Time
Figure 13.
Copyright © 2000–2013, Texas Instruments Incorporated
Submit Documentation Feedback
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5
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
TYPICAL APPLICATIONS
Figure 14. Wide Input Range Reference
Figure 15. Micropower Reference from 9V Battery
Figure 16. Reference from 1.5V Battery
*IQ ≃ 30μA
Figure 17. Micropower* 5V Regulator
6
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Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
*IQ ≃20μA standby current
Figure 18. Micropower* 10V Reference
Figure 19.
Copyright © 2000–2013, Texas Instruments Incorporated
Figure 20. Precision 1μA to 1mA Current Sources
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Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
7
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
METER THERMOMETERS
Calibration
1. Short LM385-1.2-N, adjust R3 for IOUT= temp at 1μA/°K
2. Remove short, adjust R2 for correct reading in centigrade
†IQ at 1.3V≃500μA
IQ at 1.6V≃2.4mA
Figure 21. 0°C−100°C Thermometer
Figure 22.
*2N3638 or 2N2907 select for inverse HFE ≃ 5
†Select for operation at 1.3V
‡IQ ≃ 600μA to 900μA
Figure 23. Lower Power Thermometer
8
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Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
Calibration
1. Short LM385-1.2-N, adjust R3 for IOUT= temp at 1.8μA/°K
2. Remove short, adjust R2 for correct reading in °F
Figure 24. 0°F−50°F Thermometer
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck
coefficient.
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2.
Figure 25. Micropower Thermocouple Cold Junction Compensator
Copyright © 2000–2013, Texas Instruments Incorporated
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Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
9
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
Thermocouple
Seebeck
R1
R2
Voltage
Voltage
Type
Coefficient
(Ω)
(Ω)
Across R1
Across R2
@ 25°C
(mV)
(μV/°C)
(mV)
J
52.3
523
1.24k
15.60
14.32
T
42.8
432
1k
12.77
11.78
K
40.8
412
953Ω
12.17
11.17
S
6.4
63.4
150Ω
1.908
1.766
Typical supply current 50μA
Calibration
1. Adjust R1 so that V1 = temp at 1mV/°K
2. Adjust V2 to 273.2mV
†IQ for 1.3V to 1.6V battery voltage = 50μA to 150μA
Figure 26. Centigrade Thermometer
10
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Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
SCHEMATIC DIAGRAM
Copyright © 2000–2013, Texas Instruments Incorporated
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11
LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
REVISION HISTORY
Changes from Revision D (April 2013) to Revision E
•
12
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 11
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Product Folder Links: LM185-1.2-N LM285-1.2-N LM385-1.2-N
PACKAGE OPTION ADDENDUM
www.ti.com
3-Oct-2018
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LM185BYH-1.2/NOPB
ACTIVE
TO
NDU
2
1000
Green (RoHS
& no Sb/Br)
Call TI | POST-PLATE
Level-1-NA-UNLIM
-55 to 125
( LM185BYH1.2, LM1
85BYH1.2)
LM185H-1.2/NOPB
ACTIVE
TO
NDU
2
1000
Green (RoHS
& no Sb/Br)
Call TI | POST-PLATE
Level-1-NA-UNLIM
-55 to 125
( LM185H1.2, LM185
H1.2)
LM285BXM-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
285BX
M1.2
LM285BXMX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
285BX
M1.2
LM285BXZ-1.2/LFT4
ACTIVE
TO-92
LP
3
2000
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
LM285BXZ-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
-40 to 85
285BX
Z-1.2
LM285BYM-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
285BY
M1.2
LM285BYMX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
285BY
M1.2
LM285M-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
LM285
M1.2
LM285MX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
LM285
M1.2
LM285Z-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
-40 to 85
LM28
5Z-1.2
LM385BM-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LM385
BM1.2
LM385BMX-1.2
NRND
SOIC
D
8
2500
TBD
Call TI
Call TI
0 to 70
LM385
BM1.2
LM385BMX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LM385
BM1.2
LM385BXM-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
385BX
M1.2
LM385BXMX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
385BX
M1.2
LM385BXZ-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
0 to 70
385BX
Z-1.2
Addendum-Page 1
285BX
Z-1.2
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
3-Oct-2018
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LM385BYM-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
385BY
M1.2
LM385BYMX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
385BY
M1.2
LM385BYZ-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
0 to 70
385BY
Z-1.2
LM385BZ-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
0 to 70
LM385
BZ1.2
LM385M-1.2
NRND
SOIC
D
8
95
TBD
Call TI
Call TI
0 to 70
LM385
M1.2
LM385M-1.2/NOPB
ACTIVE
SOIC
D
8
95
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LM385
M1.2
LM385M3-1.2
NRND
SOT-23
DBZ
3
1000
TBD
Call TI
Call TI
0 to 70
R11
LM385M3-1.2/NOPB
ACTIVE
SOT-23
DBZ
3
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
R11
LM385M3X-1.2
NRND
SOT-23
DBZ
3
3000
TBD
Call TI
Call TI
0 to 70
R11
LM385M3X-1.2/NOPB
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
R11
LM385MX-1.2/NOPB
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LM385
M1.2
LM385Z-1.2/LFT3
ACTIVE
TO-92
LP
3
2000
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
LM385
Z-1.2
LM385Z-1.2/LFT4
ACTIVE
TO-92
LP
3
2000
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
LM385
Z-1.2
LM385Z-1.2/NOPB
ACTIVE
TO-92
LP
3
1800
Green (RoHS
& no Sb/Br)
CU SN
N / A for Pkg Type
0 to 70
LM385
Z-1.2
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
Addendum-Page 2
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
3-Oct-2018
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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