LM185/LM285/LM385 Adjustable Micropower Voltage ReferenceJanuary 30, 2008
LM185/LM285/LM385
Adjustable Micropower Voltage References
General Description
The LM185/LM285/LM385 are micropower 3-terminal ad-justable band-gap voltage reference diodes. Operating from1.24 to 5.3V and over a 10μA to 20mA current range, theyfeature exceptionally low dynamic impedance and good tem-perature stability. On-chip trimming is used to provide tightvoltage tolerance. Since the LM185 band-gap reference usesonly transistors and resistors, low noise and good long-termstability result.
Careful design of the LM185 has made the device tolerant ofcapacitive loading, making it easy to use in almost any refer-ence application. The wide dynamic operating range allowsits use with widely varying supplies with excellent regulation.The extremely low power drain of the LM185 makes it usefulfor micropower circuitry. This voltage reference can be usedto make portable meters, regulators or general purpose ana-log circuitry with battery life approaching shelf life. Further, the
wide operating current allows it to replace older referenceswith a tighter tolerance part.
The LM185 is rated for operation over a −55°C to 125°C tem-perature range, while the LM285 is rated −40°C to 85°C andthe LM385 0°C to 70°C. The LM185 is available in a hermeticTO-46 package and a leadless chip carrier package, while theLM285/LM385 are available in a low-cost TO-92 moldedpackage, as well as S.O.
Features
■■■■■
Adjustable from 1.24V to 5.30VOperating current of 10μA to 20mA1% and 2% initial tolerance1Ω dynamic impedanceLow temperature coefficient
Connection Diagrams
TO-92
Plastic Package
TO-46
Metal Can Package
Bottom ViewSOIC Package
525009
Bottom View
525001
20-Leadless Chip Carrier
Top View
525010
Top View
525015
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LM185/LM285/LM385Ordering Information
Package−55°C to 125°C
−40°C to 85°CLM185BH
TO-46
LM185BH/883LM185BYHLM185BYH/883
TO-92
8-Pin SOIC20-Leadless ChipCarrier
LM185BE/883
Temperature Range
0°C to 70°C
LM285BXZLM285BYZLM285Z
LM285MLM285BYM
LM385BXZLM385BYZLM385BZLM385ZLM385MLM385BM
M08AE20AZ03AH03HNSCDrawing
Block Diagram
525013
Typical Applications
1.2V Reference
5.0V Reference
525014
525002
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LM185/LM285/LM385Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.(Note 2)
Reverse CurrentForward Current
Operating Temperature Range (Note 3) LM185 Series LM285 Series LM385 Series
30mA10mA
−55°C to 125°C−40°C to 85°C0°C to 70°C(Note 4)
LM185, LM285LM185BX,LM185BYLM185B,LM285BX,LM285BY
ESD Susceptibility (Note 8)2kVStorage Temperature−55°C to 150°CSoldering Information TO-92 Package (10 sec.)260°C TO-46 Package (10 sec.)300°C SO Package Vapor Phase (60 sec.)215°C Infrared (15 sec.)220°CSee An-450 “Surface Mounting Methods and Their Effecton Product Reliability” for other methods of solderingsurface mount devices.
Electrical Characteristics
LM385
LM285
Typ
LM385BX,LM385BY
LM385
Units
ParameterConditions
Typ
TestedDesignTestedDesignLimitLimitLimitLimit(Note(Note(Note(Note5)6)5)6)
Reference
Voltage
ReferenceVoltage
Change withCurrentDynamicOutputImpedance
ReferenceVoltage
Change withOutputVoltageFeedbackCurrentMinimumOperatingCurrent (seecurve)OutputWidebandNoise
IR = 100μA
VOUT = VREFVOUT = 5.3V
IR = 100μA, 10Hz < f <10kHz
VOUT = VREFVOUT = 5.3V
IR = 100μA
IMIN< IR < 1mA1mA < IR < 20mAIR = 100μA,IAC = 0.1 IR
f =100HzVOUT =VREF VOUT =5.3V
1.240 0.24 0.30.7 1 13630 50170
1.2521.2551.2281.215110 3 20945
1.520 6 251050
1.265 1.215 110 3 20945
1.270 1.205 1.520 6 251050
1.240 0.25 0.41 2 16735 50170
(Limit) TestedDesignTestedDesign
LimitLimitLimitLimit
(Note(Note(Note(Note
5)6)5)6)1.252 1.228 115 5 301155
1.255 1.215 1.525 10 351360
1.265 1.215 115 5 301155
1.270 1.205 1.525 10 351360
V(max)V(min)mV(max)
Ω
mV(max) nA(max)μA(max) μVrms
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LM185/LM285/LM385LM185, LM285LM185BX,LM185BYLM185B,LM285BX,LM285BY
LM285
Typ
LM385
LM385BX,LM385BY
LM385
Units
ParameterConditions
Typ
TestedDesignTestedDesignLimitLimitLimitLimit(Note(Note(Note(Note5)6)5)6)
Average
TemperatureCoefficient(Note 7)
Long TermStability
IR = 100μA
X SuffixY SuffixAllOthers
20
3050
150
150
20
(Limit) TestedDesignTestedDesign
LimitLimitLimitLimit
(Note(Note(Note(Note
5)6)5)6)3050
150
150
ppm/°
c(max) ppm
IR = 100μA, T = 1000Hr,
TA = 25°C ± 0.1°C
Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device isintended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.The guaranteed specifications apply only for the test conditions listed.Note 2:Refer to RETS185H for military specifications.Note 3:For elevated temperature operation, TJmax is:
LM185LM285LM385
Thermal ResistanceθJA (Junction to Ambient)
θJC (Junction to Case)
150°C125°C100°CTO-92
180°C/W (0.4″ leads)170°C/W (0.125″ leads)
N/A
TO-46440°C/W
80°C/W
SO-8165°C/W
N/A
Note 4:Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Unless otherwise specified, allparameters apply for VREF < VOUT < 5.3V.Note 5:Guaranteed and 100% production tested.
Note 6:Guaranteed, but not 100% production tested. These limits are not to be used to calculate average outgoing quality levels.
Note 7:The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures from TMIN to TMAX, dividedby TMAX − TMIN. The measured temperatures are −55, −40, 0, 25, 70, 85, 125°C.
Note 8:The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
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LM185/LM285/LM385Typical Performance Characteristics
Temperature Drift of 3Representative Units
Feedback Current
525017
525016
Minimum Operating CurrentReverse Characteristics
525018
525019
Reverse CharacteristicsForward Characteristics
525020525021
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LM185/LM285/LM385Output Noise Voltage
Dynamic Output Impedance
525022
525023
Response Time
525024
Temperature Coefficient Typical LM185 LM285 LM385
525004
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LM185/LM285/LM385Typical Applications
Precision 10V Reference
Low AC Noise Reference
525025
525026
25V Low Current Shunt Regulator200 mA Shunt Regulator
525027
525028
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LM185/LM285/LM385Series-Shunt 20 mA Regulator
High Efficiency Low Power Regulator
525029
525030
Voltage Level DetectorVoltage Level Detector
525031525032
Fast Positive Clamp
2.4V + ΔVD1
Bidirectional Clamp
±2.4V
525034
525033
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LM185/LM285/LM385Bidirectional Adjustable Clamp
±1.8V to ±2.4V
Bidirectional Adjustable Clamp
±2.4V to ±6V
525035
525036
Simple Floating Current DetectorCurrent Source
525037
525038
Precision Floating Current Detector
525039
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LM185/LM285/LM385*D1 can be any LED, VF=1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if ITHRESHOLD falls below the threshold current, except with I=O.
Centigrade Thermometer, 10mV/°CFreezer Alarm
525011
525012
Schematic Diagram
525008
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LM185/LM285/LM385Physical Dimensions inches (millimeters) unless otherwise noted
20-Leadless Chip Carrier (E)NS Package Number E20A
TO-46 Metal Can Package (H)NS Package Number H03H
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LM185/LM285/LM385SO Package (M)
NS Package Number M08A
TO-92 Plastic Package (Z)NS Package Number Z03A
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LM185/LM285/LM385Notes
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LM185/LM285/LM385 Adjustable Micropower Voltage ReferenceNotes
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