285BXM2.5 [ETC]
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| 型号： | 285BXM2.5 |
| 厂家： | 
ETC |
| 描述： | 没有 |
| 文件： | 总13页 (文件大小：741K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 2005
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-terminal band-gap voltage regulator diodes. Operating
over a 20 µA to 20 mA current range, they feature excep-
tionally low dynamic impedance and good temperature sta-
bility. On-chip trimming is used to provide tight voltage toler-
ance. Since the LM-185-2.5 band-gap reference uses only
transistors and resistors, low noise and good long term
stability result.
Features
Careful design of the LM185-2.5 has made the device ex-
ceptionally 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.
n
20 mV ( 0.8%) max. initial tolerance (A grade)
n Operating current of 20 µA to 20 mA
n 0.6Ω dynamic impedance (A grade)
n Low temperature coefficient
n Low voltage reference—2.5V
n 1.2V device and adjustable device also
available—LM185-1.2 series and LM185 series,
respectively
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
requiring 1.2V see LM185-1.2.
Connection Diagrams
TO-92
Plastic Package
SO Package
00551908
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
00551911
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
00551929
* 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
© 2005 National Semiconductor Corporation
DS005519
www.national.com
Connection Diagrams (Continued)
LCC
TO-46
Leadless Chip Carrier
Metal Can Package
00551913
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
00551914
Order Number LM185E-2.5/883
See NS Package Number E20A
See NS Package Number H02A
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2
Absolute Maximum Ratings (Notes 1,
LM385-2.5
0˚C to 70˚C
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.)
−55˚C to + 150˚C
2)
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
Operating Temperature
Range (Note 3)
LM185-2.5
30 mA
10 mA
215˚C
220˚C
See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” for other methods of soldering surface
mount devices.
−55˚C to + 125˚C
−40˚C to + 85˚C
LM285-2.5
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
IR = 100 µA
2.500
2.500
12
V(Min)
V(Max)
V(Min)
V(Max)
µA
2.520
2.470
2.530
20
Minimum Operating
Current
18
1
(Max)
mV
Reverse Breakdown
Voltage Change with
Current
IMIN ≤ IR ≤ 1mA
1.5
20
(Max)
mV
1 mA ≤ IR ≤ 20 mA
10
(Max)
Ω
Reverse Dynamic
Impedance
IR = 100 µA,
f = 20 Hz
0.2
0.6
1.5
Wideband Noise (rms)
IR = 100 µA
10 Hz ≤ f ≤ 10 kHz
IR = 100 µA,
T = 1000 Hr,
TA = 25˚C 0.1˚C
IMIN ≤ IR ≤ 20 mA
X Suffix
120
µV
Long Term Stability
20
ppm
Average Temperature
Coefficient (Note 7)
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
Design
Limit
Tested Design
Limit
(Note
6)
Limit
(Note
5)
Limit
(Note
5)
Limit
(Note
6)
(Note 5) (Note
8)
(Note 6)
Reverse
TA = 25˚C,
2.5
13
2.462
2.462
2.425
V(Min)
V(Max)
Breakdown
Voltage
20 µA ≤ IR ≤ 20
mA
2.538
20
2.538
20
2.575
Minimum
30
30
20
15
30
20
µA
Operating
Current
(Max)
LM385M3-2.5
Reverse
20 µA ≤ IR ≤ 1
mA
1
1.5
20
2.0
20
2.5
25
2.0
2.5
mV
(Max)
mV
Breakdown
Voltage Change
with Current
1 mA ≤ IR ≤ 20
mA
10
20
25
(Max)
Reverse
IR = 100 µA,
1
Ω
Dynamic
Impedance
Wideband
Noise (rms)
f = 20 Hz
IR = 100 µA,
120
µV
10 Hz ≤ f ≤ 10
kHz
Long Term
Stability
IR = 100 µA,
T = 1000 Hr,
TA = 25˚C
0.1˚C
20
ppm
Average
IR = 100 µA
Temperature
Coefficient
(Note 7)
X Suffix
30
50
30
50
ppm/˚C
Y Suffix
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, T
is:
J MAX
LM185
LM285
LM385
150˚C
125˚C
100˚C
Thermal Resistance
TO-92
TO-46
SO-8
SOT-23
θja (Junction to Ambient)
180˚C/W (0.4" Leads) 440˚C/W 165˚C/W 283˚C/W
170˚C/W (0.125" Leads)
θjc (Junction to Case)
N/A
80˚C/W
N/A
N/A
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4
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T = T = 25˚C.
A
J
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 T
MAX
and T , divided by T
–T . The measured temperatures are −55˚C, −40˚C, 0˚C, 25˚C, 70˚C, 85˚C, 125˚C.
MIN
MAX
MIN
Note 8: A military RETS electrical specification available on request.
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
00551916
00551915
Forward Characteristics
Temperature Drift
00551917
00551918
Reverse Dynamic
Impedance
Reverse Dynamic
Impedance
00551919
00551920
5
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Typical Performance Characteristics (Continued)
Noise Voltage
Filtered Output Noise
00551922
00551921
Response Time
00551923
Applications
LM385-2.5 Applications
Wide Input Range Reference
Micropower 5V Reference (Note 9)
00551912
Micropower Reference from 9V Battery
00551909
Note 9: I . 40 µA
Q
00551902
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6
LM385-2.5 Applications (Continued)
Micropower 10V Reference (Note 10)
00551910
Note 10: I . 30 µA standby current
Q
Precision 1 µA to 1 mA Current Sources
00551925
00551924
7
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LM385-2.5 Applications (Continued)
METER THERMOMETERS
0˚C–100˚C Thermomemter
Micropower Thermocouple Cold Junction
Compensator
00551926
Calibration
1. Short LM385-2.5, adjust R3 for IOUT=temp at 1µA/˚K
2. Remove short, adjust R2 for correct reading in
centigrade
00551906
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin
temperature multiplied by the thermocouple Seebeck
coefficient.
0˚F–50˚F Thermomemter
2. Adjust zero ADJ pot until voltage across R2 equals the
thermocouple Seebeck coefficient multiplied by 273.2.
00551927
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
Seebeck
Voltage
Voltage
Thermocouple
Type
Co-
R1
R2
Across R1 Across R2
@
efficient (Ω) (Ω)
25˚C
(mV)
(µV/˚C)
(mV)
15.60
12.77
12.17
1.908
J
T
K
52.3
42.8
40.8
6.4
523 1.24k
432 1k
14.32
11.78
11.17
1.766
412 953Ω
63.4 150Ω
S
Typical supply current 50 µA
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8
LM385-2.5 Applications (Continued)
Improving Regulation of Adjstable Regulators
00551907
Schematic Diagram
00551901
9
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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
www.national.com
10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
SOT-23 Package (M3)
Order Number LM385M3-2.5
NS Package Number MA03B
11
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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
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12
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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
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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