TI1 LM185-2.5QML Lm185-2.5qml micropower voltage reference diode Datasheet

LM185-2.5QML
LM185-2.5QML Micropower Voltage Reference Diode
Literature Number: SNVS385
LM185-2.5QML
Micropower Voltage Reference Diode
General Description
The LM185-2.5 are micropower 2-terminal band-gap voltage
regulator diodes. Operating over a 20 µA to 20 mA current
range, they feature exceptionally low dynamic impedance
and good temperature stability. On-chip trimming is used to
provide tight voltage tolerance. Since the LM185-2.5 bandgap reference uses only transistors and resistors, low noise
and good long term stability result.
Careful design of the LM185-2.5 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 LM185-2.5 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. For applications
requiring 1.2V see LM185-1.2.
Features
n
n
n
n
Operating current of 20 µA to 20 mA
0.6Ω dynamic impedance (A grade)
Low temperature coefficient
Low voltage reference — 2.5V
Ordering Information
NS Part Number
JAN Part Number
NS Package Number
Package Description
LM185H-2.5-SMD
5962–8759402XA
H02A
2LD, T0–46 Metal Can
LM185H-2.5/883
H02A
2LD, T0–46 Metal Can
LM185WG-2.5-QV
5962–8759402VYA
WG10A
10LD Ceramic SOIC
LM185WG-2.5/883
5962–8759402YA
WG10A
10LD Ceramic SOIC
LM185BYH2.5/883
LM185BYH2.5-SMD
LM185BYH2.5-QV
H02A
2LD, T0–46 Metal Can
5962–8759406XA
H02A
2LD, T0–46 Metal Can
5962–8759406VXA
H02A
2LD, T0–46 Metal Can
Connection Diagrams
Ceramic SOIC (WG)
TO-46 Metal Can Package (H)
20156203
See NS Package Number WG10A
© 2005 National Semiconductor Corporation
DS201562
20156213
Bottom View
See NS Package Number H02A
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LM185-2.5QML Micropower Voltage Reference Diode
November 2005
LM185-2.5QML
Schematic Diagram
20156201
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2
LM185-2.5QML
Absolute Maximum Ratings
(Note 1)
Reverse Current
30 mA
Forward Current
10 mA
Operating Temperature Range
−55˚C ≤ TA ≤ + 125˚C
Storage Temperature
−55˚C ≤ TA ≤ + 150˚C
Maximum Junction Temperature (TJmax) (Note 2)
150˚C
Lead Temperature (Soldering, 10 sec)
TO-46 Metal Can
300˚C
Ceramic SOIC
260˚C
Thermal Resistance
θJA
T0–46 Metal Can (Still Air)
300˚C/W
T0–46 Metal Can (500LF / Min Air Flow)
139˚C/W
Ceramic SOIC (Still Air)
194˚C/W
Ceramic SOIC (500LF / Min Air Flow)
128˚C/W
θJC
T0–46 Metal Can
57˚C/W
Ceramic SOIC
23˚C/W
Package Weight (Typical)
T0–46 Metal Can
TBD
Ceramic SOIC
210 mg
ESD Tolerance (Note 3)
4000V
Quality Conformance Inspection
Mil-Std-883, Method 5005 - Group A
Subgroup
Description
1
Static tests at
Temp ˚C
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
3
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LM185-2.5QML
LM185–2.5 Electrical Characteristics
DC Parameters
Symbol
VRef
Parameter
Reverse Breakdown Voltage
Conditions
Notes
VF
Forward Bias Voltage
Max
Units
Subgroups
IR = 20µA
2.462 2.538
V
1
IR = 30µA
2.425 2.575
V
2, 3
IR = 1mA
2.462 2.538
V
1
2.425 2.575
V
2, 3
IR = 20mA
∆VRef / ∆IR Reverse Breakdown Voltage
Change with Current
Min
20µA ≤ IR ≤ 1mA
2.462 2.538
V
1
2.425 2.575
V
2, 3
mV
1
2, 3
-1.0
1.0
30µA ≤ IR ≤ 1mA
-1.5
1.5
mV
1mA ≤ IR ≤ 20mA
-10.0
10.0
mV
1
-20.0
20.0
mV
2, 3
-1.0
-0.4
V
1
IF = 2mA
DC Drift Parameters
Delta calculations performed on QMLV devices at group B , subgroup 5, unless otherwise specified on IPI.
Symbol
VRef
Min
Max
Units
Subgroups
IR = 20µA
-10
10
mV
1
IR = 20mA
-10
10
mV
1
Min
Max
Units
Subgroups
V
1
2, 3
Parameter
Reverse Breakdown Voltage
Conditions
Notes
LM185BY–2.5 Electrical Characteristics
DC Parameters
Symbol
VRef
Parameter
Reverse Breakdown Voltage
Conditions
Notes
IR = 20µA
2.462 2.538
IR = 30µA
2.425 2.575
V
IR = 1mA
2.462 2.538
V
1
2.425 2.575
V
2, 3
2.462 2.538
V
1
V
2, 3
IR = 20mA
2.425 2.575
∆VRef / ∆IR Reverse Breakdown Voltage
Change with Current
20µA ≤ IR ≤ 1mA
-1.0
1.0
mV
1
30µA ≤ IR ≤ 1mA
-1.5
1.5
mV
2, 3
1mA ≤ IR ≤ 20mA
VF
Forward Bias Voltage
TC
Temperature Coefficient
IF = 2mA
-10.0
10.0
mV
1
-20.0
20.0
mV
2, 3
−1.0
−0.4
V
1
50
PPM/˚C
2, 3
(Note 4)
DC Drift Parameters
Delta calculations performed on QMLV devices at group B , subgroup 5, unless otherwise specified on IPI.
Symbol
Parameter
Conditions
Notes
Min
Max
Units
Subgroups
VRef 1
Reverse Breakdown Voltage
IR = 20µA
-10
10
mV
1
VRef 2
Reverse Breakdown Voltage
IR = 20mA
-10
10
mV
1
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4
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction
to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/θJA or the
number given in the Absolute Maximum Ratings, whichever is lower.
Note 3: Human body model, 1.5 kΩ in series with 100 pF
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 ∆VRef / (TMax − TMin)
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
20156216
20156215
Forward Characteristics
Temperature Drift
20156217
20156218
5
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LM185-2.5QML
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.
LM185-2.5QML
Typical Performance Characteristics
(Continued)
Reverse Dynamic
Impedance
Reverse Dynamic
Impedance
20156219
20156220
Noise Voltage
Filtered Output Noise
20156222
20156221
Response Time
20156223
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6
LM185-2.5QML
Applications
Wide Input Range Reference
20156212
Micropower Reference from 9V Battery
20156202
Micropower 10V Reference (Note 6)
Micropower 5V Reference (Note 5)
20156210
Note 6: IQ . 30 µA standby current
20156209
Note 5: IQ . 40 µA
7
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LM185-2.5QML
Applications
(Continued)
Precision 1 µA to 1 mA Current Sources
20156225
20156224
METER THERMOMETERS
0˚F–50˚F Thermometer
0˚C–100˚C Thermometer
20156227
20156226
Calibration
1. Short LM385-2.5, adjust R3 for IOUT=temp at 1.8 µA/˚K
2. Remove short, adjust R2 for correct reading in ˚F
Calibration
1. Short LM385-2.5, adjust R3 for IOUT=temp at 1µA/˚K
2. Remove short, adjust R2 for correct reading in
centigrade
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8
LM185-2.5QML
Applications
(Continued)
Improving Regulation of Adjustable Regulators
20156207
Micropower Thermocouple Cold Junction Compensator
20156206
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.
Voltage
Voltage
Thermocouple
Seebeck
Co-
R1
R2
Across R1
Across R2
Type
efficient
(Ω)
(Ω)
@ 25˚C
(mV)
(µV/˚C)
(mV)
J
52.3
523 1.24k
15.60
14.32
T
42.8
432
12.77
11.78
K
40.8
412 953Ω
12.17
11.17
S
6.4
63.4 150Ω
1.908
1.766
1k
Typical supply current 50 µA
9
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LM185-2.5QML
Revision History Section
Released
11/08/05
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Revision
A
Section
Originator
New Release, Corporate format
L. Lytle
10
Changes
2 MDS data sheets converted into one Corp.
data sheet format. MNLM185-2.5-X Rev 2A2
and MNLM185-2.5BY-X Rev 1B1 will be
archived.
LM185-2.5QML
Physical Dimensions
inches (millimeters) unless otherwise noted
Ceramic SOIC Package (WG)
NS Package Number WG10A
TO-46 Metal Can Package (H)
NS Package Number H02A
11
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LM185-2.5QML Micropower Voltage Reference Diode
Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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