TI LM185-2.5-N

LM185-2.5,LM285-2.5,LM385-2.5
LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode
Literature Number: SNVS743C
LM185-2.5/LM285-2.5/LM385-2.5
Micropower Voltage Reference Diode
General Description
The LM185-2.5/LM285-2.5/LM385-2.5 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
LM-185-2.5 band-gap 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.
The LM185-2.5 is rated for operation over a −55°C to 125°C
temperature range while the LM285-2.5 is rated −40°C to 85°
C and the LM385-2.5 0°C to 70°C. The LM185-2.5/LM285-2.5
are available in a hermetic TO-46 package and the
LM285-2.5/LM385-2.5 are also available in a low-cost TO-92
molded package, as well as S.O. and SOT-23. The
LM185-2.5 is also available in a hermetic leadless chip carrier
package.
Features
■
■
■
■
■
■
±20 mV (±0.8%) max. initial tolerance (A grade)
Operating current of 20 μA to 20 mA
0.6Ω dynamic impedance (A grade)
Low temperature coefficient
Low voltage reference—2.5V
1.2V device and adjustable device also available—
LM185-1.2 series and LM185 series, respectively
Connection Diagrams
TO-92
Plastic Package
SO Package
551908
Bottom View
Order Number LM285Z-2.5,
LM285BXZ-2.5, LM285BYZ-2.5
LM385Z-2.5, LM385AXZ-2.5
LM385AYZ-2.5, LM385BZ-2.5,
LM385BXZ-2.5 or LM385BYZ-2.5
See NS Package Number Z03A
551911
Order Number LM285M-2.5,
LM285BXM-2.5, LM285BYM-2.5
LM385M-2.5, LM385BM-2.5
LM385BXM-2.5 or LM385BYM-2.5
See NS Package Number M08A
SOT-23
551929
* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating.
Order Number LM385M3-2.5
See NS Package Number MA03B
© 2008 National Semiconductor Corporation
5519
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LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode
January 30, 2008
LM185-2.5/LM285-2.5/LM385-2.5
LCC
Leadless Chip Carrier
TO-46
Metal Can Package
551913
Bottom View
Order Number LM185H-2.5,
LM185H-2.5/883, LM185BXH-2.5,
LM185BXH-2.5/883, LM185BYH-2.5,
LM185BYH2.5/883, LM285H-2.5,
or LM285BYH-2.5
See NS Package Number H02A
551914
Order Number LM185E-2.5/883
See NS Package Number E20A
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2
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
Forward Current
Operating Temperature
Range (Note 3)
LM185-2.5
LM285-2.5
LM385-2.5
30 mA
10 mA
−55°C to + 125°C
−40°C to + 85°C
0°C to 70°C
2kV
−55°C to + 150°C
260°C
300°C
215°C
220°C
See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” for other methods of soldering surface
mount devices.
Electrical Characteristics
(Note 4)
Parameter
Reverse Breakdown
Conditions
Typ
IR = 100 μA
2.500
Voltage
LM385A-2.5
LM385AX-2.5
LM385AY-2.5
Tested
Limit
(Note 5)
12
V(Min)
2.520
V(Max)
V(Min)
V(Max)
2.470
2.530
18
20
1
1.5
Current
Reverse Breakdown
IMIN ≤ IR ≤ 1mA
Voltage Change with
Current
Units
(Limits)
2.480
2.500
Minimum Operating
Design
Limit
(Note 6)
μA
(Max)
mV
(Max)
1 mA ≤ IR ≤ 20 mA
10
20
mV
(Max)
Reverse Dynamic
IR = 100 μA,
Impedance
f = 20 Hz
Wideband Noise (rms)
IR = 100 μA
0.6
0.2
Ω
1.5
120
μV
20
ppm
10 Hz ≤ f ≤ 10 kHz
Long Term Stability
IR = 100 μA,
T = 1000 Hr,
TA = 25°C ±0.1°C
Average Temperature
IMIN ≤ IR ≤ 20 mA
Coefficient (Note 7)
X Suffix
Y Suffix
All Others
ppm/°C
(Max)
30
50
150
3
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LM185-2.5/LM285-2.5/LM385-2.5
ESD Susceptibility (Note 9)
Storage Temperature
Soldering Information
TO-92 Package (10 sec.)
TO-46 Package (10 sec.)
SO and SOT Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
Absolute Maximum Ratings (Notes 1, 2)
LM185-2.5/LM285-2.5/LM385-2.5
Electrical Characteristics
Parameter
Conditions
LM185-2.5
LM185BX-2.5
LM185BY-2.5
LM285-2.5
LM285BX-2.5
LM285BY-2.5
Typ
Tested
Limit
(Notes 5, 8)
Reverse
Breakdown
Voltage
TA = 25°C,
2.5
20 μA ≤ IR ≤ 20 mA
Minimum Operating
Current
LM385M3-2.5
IR = 100 μA,
Impedance
f = 20 Hz
Wideband Noise
(rms)
IR = 100 μA,
Design
Limit
(Note 6)
Tested
Limit
(Note 5)
LM385-2.5
Design
Limit
(Note 6)
Units
(Limit)
Tested Design
Limit
Limit
(Note 5) (Note 6)
2.462
2.462
2.425
V(Min)
2.538
2.538
2.575
V(Max)
13
20
Reverse
20 μA ≤ IR ≤ 1 mA
Breakdown Voltage
Change with
1 mA ≤ IR ≤ 20 mA
Current
Reverse Dynamic
LM385B-2.5
LM385BX-2.5
LM385BY-2.5
30
20
30
20
30
15
20
μA
(Max)
1
1.5
2.0
2.5
2.0
2.5
mV
(Max)
10
20
20
25
20
25
mV
(Max)
1
Ω
120
μV
20
ppm
10 Hz ≤ f ≤ 10 kHz
Long Term Stability IR = 100 μA,
T = 1000 Hr,
TA = 25°C ±0.1°C
Average
IR = 100 μA
Temperature
Coefficient (Note 7) X Suffix
Y Suffix
All Others
30
50
30
50
150
150
150
ppm/°C
ppm/°C
ppm/°C
(Max)
Note 1: 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, 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-2.5 for military specifications.
Note 3: For elevated temperature operation, TJ MAX is:
LM185
LM285
LM385
150°C
125°C
100°C
Thermal Resistance
θja (Junction to Ambient)
TO-92
TO-46
SO-8
SOT-23
180°C/W (0.4″ Leads)
440°C/W
165°C/W
283°C/W
80°C/W
N/A
N/A
170°C/W (0.125″ Leads)
θjc (Junction to Case)
N/A
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C.
Note 5: Guaranteed and 100% production tested.
Note 6: Guaranteed, but not 100% production tested. These limits are not 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 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.
Note 8: A military RETS electrical specification available on request.
Note 9: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
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LM185-2.5/LM285-2.5/LM385-2.5
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
551916
551915
Forward Characteristics
Temperature Drift
551917
551918
Reverse Dynamic
Impedance
Reverse Dynamic
Impedance
551919
551920
5
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LM185-2.5/LM285-2.5/LM385-2.5
Noise Voltage
Filtered Output Noise
551922
551921
Response Time
551923
Applications
LM385-2.5 Applications
Wide Input Range Reference
Micropower 5V Reference
551912
Micropower Reference from 9V Battery
551909
Note 10: IQ ≃ 40 μA
551902
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LM185-2.5/LM285-2.5/LM385-2.5
Micropower 10V Reference
551910
Note 11: IQ ≃ 30 μA standby current
PRECISION 1 μA to 1 mA CURRENT SOURCES
551925
551924
7
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LM185-2.5/LM285-2.5/LM385-2.5
METER THERMOMETERS
0°C–100°C Thermomemter
551926
Calibration
1. Short LM385-2.5, adjust R3 for IOUT=temp at 1μA/°K
Remove short, adjust R2 for correct reading in centigrade
0°F–50°F Thermomemter
551927
Calibration
1. Short LM385-2.5, adjust R3 for IOUT=temp at 1.8 μA/°K
Remove short, adjust R2 for correct reading in °F
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LM185-2.5/LM285-2.5/LM385-2.5
Micropower Thermocouple Cold Junction Compensator
551906
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.
Thermocouple
Type
Seebeck
Coefficient
R1
R2
(Ω)
(Ω)
52.3
42.8
40.8
S
6.4
Voltage
Across R2
(mV)
(mV)
(μV/°C)
J
T
K
Voltage
Across R1
@25°C
523 1.24k
432 1k
412 953Ω
63.4 150Ω
15.60
12.77
12.17
14.32
11.78
11.17
1.908
1.766
Typical supply current 50 μA
Improving Regulation of Adjstable Regulators
551907
9
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LM185-2.5/LM285-2.5/LM385-2.5
Schematic Diagram
551901
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10
LM185-2.5/LM285-2.5/LM385-2.5
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM185E-2.5/883
NS Package Number E20A
TO-46 Metal Can Package (H)
Order Number LM185H-2.5, LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883,
LM185BYH-2.5, LM185BYH-2.5/883, LM285H-2.5, or LM285BYH-2.5
NS Package Number H02A
11
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LM185-2.5/LM285-2.5/LM385-2.5
SOT-23 Package (M3)
Order Number LM385M3-2.5
NS Package Number MA03B
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12
LM185-2.5/LM285-2.5/LM385-2.5
Small Outline (SO-8) Package (M)
Order Number LM285M-2.5, LM285BXM-2.5, LM285BYM-2.5,
LM385M-2.5, LM385BM-2.5, LM385BXM-2.5 or LM385BYM-2.5
NS Package Number M08A
13
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LM185-2.5/LM285-2.5/LM385-2.5
TO-92 Plastic Package (Z)
Order Number LM285Z-2.5, LM285BXZ-2.5, LM285BYZ-2.5,
LM385Z-2.5, LM385AXZ-2.5, LM385AYZ-2.5,
LM385BZ-2.5, LM385BXZ-2.5 or LM385BYZ-2.5
NS Package Number Z03A
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LM185-2.5/LM285-2.5/LM385-2.5
Notes
LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode
Notes
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