LM185QML
LM185QML Adjustable Micropower Voltage References
Literature Number: SNVS386C
June 12, 2008
LM185QML
Adjustable Micropower Voltage References
General Description
The LM185 are micropower 3-terminal adjustable band-gap
voltage reference diodes. Operating from 1.24 to 5.3V and
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 band-gap reference uses only transistors and re-
sistors, low noise and good long-term stability result.
Careful design of the LM185 has made the device tolerant of
capacitive loading, making it easy to use in almost any refer-
ence application. The wide dynamic operating range allows
its use with widely varying supplies with excellent regulation.
The extremely low power drain of the LM185 makes it useful
for micropower circuitry. This voltage reference can be used
to 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 references
with a tighter tolerance part.
Features
■Adjustable from 1.24V to 5.30V
■Operating current of 10μA to 20mA
■1Ω dynamic impedance
■Low temperature coefficient
Ordering Information
NS Part Number SMD Part Number NS Package Number Package Description
LM185BE/883 E20A 20LD Leadless Chip Carrier
LM185BH/883 H03H 3LD; T0–46 Metal Can
LM185BYH/883 H03H 3LD; T0–46 Metal Can
LM185BYH-SMD 5962–9091401MXA H03H 3LD; T0–46 Metal Can
LM185BWG/883 5962–9091402QYA WG10A 10LD Ceramic SOIC
Connection Diagrams
TO-46
Metal Can Package
20156301
Bottom View
20-Leadless Chip Carrier
20156315
Top View
© 2008 National Semiconductor Corporation 201563 www.national.com
LM185QML Adjustable Micropower Voltage Reference
10-Lead Ceramic SOIC
20156303
Top View
Block Diagram
20156313
Schematic Diagram
20156308
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LM185QML
Absolute Maximum Ratings (Note 1)
Reverse Current 30mA
Forward Current 10mA
Operating Temperature Range −55°C ≤ TA ≤ 125°C
Storage Temperature −55°C ≤ TA ≤ 150°C
Maximum Junction Temperature TJmax 150°C
Lead Temperature (soldering, 10 seconds) 300°C
Thermal Resistance
θJA
LCC Package (Still Air) 100°C/W
LCC Package (500LF/Min Air flow) 73°C/W
Metal Can Package (Still Air) 300°C/W
Metal Can Package (500LF/Min Air flow) 139°C/W
Ceramic SOIC Package (Still Air) 194°C/W
Ceramic SOIC Package (500LF/Min Air flow) 128°C/W
θJC
LCC Package 25°C/W
Metal Can Package 57°C/W
Ceramic SOIC Package 23°C/W
Package Weight (Typical)
LCC Package TBD
Metal Can Package TBD
Ceramic SOIC Package 210mg
ESD Tolerance (Note 2) 500V
Quality Conformance Inspection
Mil-Std-883, Method 5005 - Group A
Subgroup Description Temp °C
1 Static tests at 25
2 Static tests at 125
3 Static tests at -55
4 Dynamic tests at 25
5 Dynamic tests at 125
6 Dynamic tests at -55
7 Functional tests at 25
8A Functional tests at 125
8B Functional tests at -55
9 Switching tests at 25
10 Switching tests at 125
11 Switching tests at -55
12 Settling time at 25
13 Settling time at 125
14 Settling time at -55
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LM185QML
LM185B Electrical Characteristics
DC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
VRef Reference Voltage IR = 100µA 1.228 1.252 V 1
1.215 1.255 V 2, 3
IR = 9µA 1.228 1.252 V 1
IR = 10µA 1.215 1.255 V 2, 3
IR = 1mA 1.228 1.252 V 1
1.215 1.255 V 2, 3
IR = 20mA 1.228 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 100µA 1.228 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 45µA 1.288 1.252 V 1
VR = 5.3V, IR = 50µA 1.215 1.255 V 2, 3
VR = 5.3V, IR = 1.0mA 1.288 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 20mA 1.288 1.252 V 1
1.215 1.255 V 2, 3
ΔVRef/ΔIRReference Voltage Change with
Current
9µA ≤ IR ≤ 1mA 1.0 mV 1
10µA ≤ IR ≤ 1mA 1.5 mV 2, 3
1mA ≤ IR ≤ 20mA 10 mV 1
20 mV 2, 3
VR = 5.3V, 45µA ≤ IR ≤ 1mA 1.0 mV 1
VR = 5.3V, 50µA ≤ IR ≤ 1mA 1.5 mV 2, 3
VR = 5.3V, 1mA ≤ IR ≤ 20mA 10 mV 1
20 mV 2, 3
ΔVRef / ΔVOReference Voltage Change with
Output Voltage
VR = 5.3V, IR = 100µA 3.0 mV 1
6.0 mV 2, 3
IFFeedback Current IR = 9µA 20 nA 1
IR = 10µA 25 nA 2, 3
IR = 20mA 20 nA 1
25 nA 2, 3
VR = 5.3V, IR = 45µA 20 nA 1
VR = 5.3V, IR = 50µA 25 nA 2, 3
VR = 5.3V, IR = 20mA 20 nA 1
25 nA 2, 3
ICMinimum Operating Current VR = VRef (Note 3) 9.0 µA 1
(Note 3) 10 µA 2, 3
VR = 5.3V (Note 3) 45 µA 1
(Note 3) 50 µA 2, 3
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LM185QML
LM185BY Electrical Characteristics
DC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
VRef Reference Voltage IR = 100µA 1.228 1.252 V 1
1.215 1.255 V 2, 3
IR = 9µA 1.228 1.252 V 1
IR = 10µA 1.215 1.255 V 2, 3
IR = 1mA 1.228 1.252 V 1
1.215 1.255 V 2, 3
IR = 20mA 1.228 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 100µA 1.228 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 45µA 1.288 1.252 V 1
VR = 5.3V, IR = 50µA 1.215 1.255 V 2, 3
VR = 5.3V, IR = 1.0mA 1.288 1.252 V 1
1.215 1.255 V 2, 3
VR = 5.3V, IR = 20mA 1.288 1.252 V 1
1.215 1.255 V 2, 3
ΔVRef/ΔIRReference Voltage Change with
Current
9µA ≤ IR ≤ 1mA 1.0 mV 1
10µA ≤ IR ≤ 1mA 1.5 mV 2, 3
1mA ≤ IR ≤ 20mA 10 mV 1
20 mV 2, 3
VR = 5.3V, 45µA ≤ IR ≤ 1mA 1.0 mV 1
VR = 5.3V, 50µA ≤ IR ≤ 1mA 1.5 mV 2, 3
VR = 5.3V, 1mA ≤ IR ≤ 20mA 10 mV 1
20 mV 2, 3
ΔVRef / ΔVOReference Voltage Change with
Output Voltage
VR = 5.3V, IR = 100µA 3.0 mV 1
6.0 mV 2, 3
IFFeedback Current IR = 9µA 20 nA 1
IR = 10µA 25 nA 2, 3
IR = 20mA 20 nA 1
25 nA 2, 3
VR = 5.3V, IR = 45µA 20 nA 1
VR = 5.3V, IR = 50µA 25 nA 2, 3
VR = 5.3V, IR = 20mA 20 nA 1
25 nA 2, 3
ICMinimum Operating Current VR = VRef (Note 3) 9.0 µA 1
(Note 3) 10 µA 2, 3
VR = 5.3V (Note 3) 45 µA 1
(Note 3) 50 µA 2, 3
TCTemperature Coefficient (Note 4) 50 PPM/°C 1, 2, 3
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
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. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: Human body model, 1.5 kΩ in series with 100 pF.
Note 3: Functional test.
Note 4: The average temperature coefficient is defined as the maximum deviation of reference voltage, at all measured temperatures between the operating
TMin & TMax, divided by (TMax − TMin). The measured temperatures (TMeasured) are −55°C, 25°C, & 125°C or ΔVRef / (TMax − TMin)
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LM185QML
Typical Performance Characteristics
Temperature Drift of 3
Representative Units
20156316
Feedback Current
20156317
Minimum Operating Current
20156318
Reverse Characteristics
20156319
Reverse Characteristics
20156320
Forward Characteristics
20156321
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LM185QML
Output Noise Voltage
20156322
Dynamic Output Impedance
20156323
Response Time
20156324
Temperature Coefficient Typical
LM185
20156304
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LM185QML
Typical Applications
Precision 10V Reference
20156325
Low AC Noise Reference
20156326
25V Low Current Shunt Regulator
20156327
200 mA Shunt Regulator
20156328
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LM185QML
Series-Shunt 20 mA Regulator
20156329
High Efficiency Low Power Regulator
20156330
Voltage Level Detector
20156331
Voltage Level Detector
20156332
Fast Positive Clamp
2.4V + ΔVD1
20156333
Bidirectional Clamp
±2.4V
20156334
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LM185QML
Bidirectional Adjustable Clamp
±1.8V to ±2.4V
20156335
Bidirectional Adjustable Clamp
±2.4V to ±6V
20156336
Simple Floating Current Detector
20156337
Current Source
20156338
Precision Floating Current Detector
20156339
*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.
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LM185QML
Centigrade Thermometer, 10mV/°C
20156311
Freezer Alarm
20156312
1.2V Reference
20156314
5.0V Reference
20156302
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LM185QML
Revision History Section
Released Revision Section Originator Changes
11/08/05 A New Release, Corporate format L. Lytle 2 MDS data sheets converted into one Corp.
data sheet format. MNLM185B-X Rev 0B0 and
MNLM185BY-X Rev 0B0 will be archived.
04/06/06 B Ordering Information Table, WG
Connection Diagram, Absolute
Maximum Ratings Section, Physical
Dimensions Section
R. Malone Added NSID, Connection Diagram, Physical
Dimension Dwg, Thermal Resistance and
Package Weight for WG package. Revision A
will be Archived.
06/12/08 C LM185B and LM185BY Electrical
Section
Larry McGee Correct IC test, VR = VREF condition, subgroup
1, 2, 3 moved limits to the maximum column.
Revision B will be Archived.
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LM185QML
Physical 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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LM185QML
Ceramic SOIC Package (WG)
NS Package Number WG10A
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LM185QML
Notes
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LM185QML
Notes
LM185QML Adjustable Micropower Voltage Reference
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