LM185BYH2.5-MLS [NSC]
1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5V, MBCY2, METAL CAN, TO-46, 2 PIN;
| 型号： | LM185BYH2.5-MLS |
| 厂家： | 
National Semiconductor |
| 描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5V, MBCY2, METAL CAN, TO-46, 2 PIN 输出元件 |
| 文件： | 总17页 (文件大小：358K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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January 30, 2008
LM185-2.5/LM285-2.5/LM385-2.5
Micropower Voltage Reference Diode
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.
General Description
The LM185-2.5/LM285-2.5/LM385-2.5 are micropower 2-ter-
minal band-gap voltage regulator diodes. Operating over a 20
μA to 20 mA current range, they feature exceptionally low dy-
namic 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 re-
sistors, low noise and good long term stability result.
Careful design of the LM185-2.5 has made the device excep-
tionally tolerant of capacitive loading, making it easy to use in
almost any reference application. The wide dynamic operat-
ing range allows its use with widely varying supplies with
excellent regulation.
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
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. Fur-
ther, the wide operating current allows it to replace older
references with a tighter tolerance part. For applications re-
quiring 1.2V see LM185-1.2.
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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LCC
TO-46
Metal Can Package
Leadless Chip Carrier
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
551914
Order Number LM185E-2.5/883
See NS Package Number E20A
See NS Package Number H02A
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2
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.)
2kV
Absolute Maximum Ratings (Notes 1, 2)
−55°C to + 150°C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
260°C
300°C
Reverse Current
Forward Current
30 mA
10 mA
215°C
220°C
Operating Temperature
Range (Note 3)
LM185-2.5
LM285-2.5
LM385-2.5
−55°C to + 125°C
−40°C to + 85°C
0°C to 70°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)
LM385A-2.5
LM385AX-2.5
LM385AY-2.5
Units
(Limits)
Parameter
Conditions
Typ
Tested
Design
Limit
Limit
(Note 5)
2.480
(Note 6)
Reverse Breakdown
Voltage
2.500
2.500
12
V(Min)
IR = 100 μA
2.520
V(Max)
V(Min)
V(Max)
2.470
2.530
20
Minimum Operating
Current
18
1
μA
(Max)
mV
Reverse Breakdown
1.5
20
IMIN ≤ IR ≤ 1mA
Voltage Change with
Current
(Max)
mV
10
1 mA ≤ IR ≤ 20 mA
(Max)
Reverse Dynamic
Impedance
0.6
IR = 100 μA,
f = 20 Hz
0.2
Ω
1.5
Wideband Noise (rms)
IR = 100 μA
120
μV
10 Hz ≤ f ≤ 10 kHz
IR = 100 μA,
Long Term Stability
T = 1000 Hr,
20
ppm
TA = 25°C ±0.1°C
Average Temperature
Coefficient (Note 7)
IMIN ≤ IR ≤ 20 mA
X Suffix
30
50
ppm/°C
(Max)
Y Suffix
All Others
150
3
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Electrical Characteristics
LM185-2.5
LM185BX-2.5
LM185BY-2.5
LM285-2.5
LM385B-2.5
LM385BX-2.5
LM385BY-2.5
LM385-2.5
Units
(Limit)
Parameter
Conditions
Typ
LM285BX-2.5
LM285BY-2.5
Tested
Limit
Design Tested
Limit Limit
Design
Limit
Tested Design
Limit
Limit
(Notes 5, 8)
2.462
(Note 6) (Note 5)
2.462
(Note 6) (Note 5) (Note 6)
2.425
Reverse
Breakdown
Voltage
TA = 25°C,
2.5
13
V(Min)
V(Max)
2.538
20
2.538
2.575
20 μA ≤ IR ≤ 20 mA
Minimum Operating
Current
30
20
30
20
15
30
20
μA
(Max)
LM385M3-2.5
Reverse
1
1.5
20
2.0
20
2.5
25
2.0
2.5
mV
(Max)
20 μA ≤ IR ≤ 1 mA
Breakdown Voltage
Change with
Current
10
20
25
mV
(Max)
1 mA ≤ IR ≤ 20 mA
Reverse Dynamic
Impedance
IR = 100 μA,
f = 20 Hz
1
Ω
Wideband Noise
(rms)
IR = 100 μA,
120
μV
10 Hz ≤ f ≤ 10 kHz
IR = 100 μA,
Long Term Stability
T = 1000 Hr,
20
ppm
TA = 25°C ±0.1°C
Average
Temperature
IR = 100 μA
Coefficient (Note 7) X Suffix
Y Suffix
30
50
30
50
ppm/°C
ppm/°C
ppm/°C
(Max)
All Others
150
150
150
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
TO-92
180°C/W (0.4″ Leads)
170°C/W (0.125″ Leads)
N/A
TO-46
SO-8
SOT-23
440°C/W
165°C/W
283°C/W
θ
θ
ja (Junction to Ambient)
80°C/W
N/A
N/A
jc (Junction to Case)
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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4
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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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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6
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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METER THERMOMETERS
0°C–100°C Thermomemter
551926
Calibration
Short LM385-2.5, adjust R3 for IOUT=temp at 1μA/°K
Remove short, adjust R2 for correct reading in centigrade
1.
0°F–50°F Thermomemter
551927
Calibration
Short LM385-2.5, adjust R3 for IOUT=temp at 1.8 μA/°K
Remove short, adjust R2 for correct reading in °F
1.
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8
Micropower Thermocouple Cold Junction Compensator
551906
Adjustment Procedure
Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient.
1.
2.
Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2.
Seebeck
Co-
Voltage
Voltage
Thermocouple
Type
R1
R2
Across R1 Across R2
efficient
@25°C
(mV)
(mV)
(Ω) (Ω)
(μV/°C)
52.3
42.8
40.8
6.4
J
T
K
S
523 1.24k
432 1k
15.60
12.77
12.17
1.908
14.32
11.78
11.17
1.766
412
953Ω
150Ω
63.4
Typical supply current 50 μA
Improving Regulation of Adjstable Regulators
551907
9
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Schematic Diagram
551901
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10
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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SOT-23 Package (M3)
Order Number LM385M3-2.5
NS Package Number MA03B
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12
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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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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14
Notes
15
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Notes
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