LM385BM-1.2 [NSC]
Micropower Voltage Reference Diode; 微功耗电压基准二极管
| 型号： | LM385BM-1.2 |
| 厂家： | 
National Semiconductor |
| 描述： | Micropower Voltage Reference Diode |
| 文件： | 总10页 (文件大小：268K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 2000
LM185-1.2/LM285-1.2/LM385-1.2
Micropower Voltage Reference Diode
The LM185-1.2 is rated for operation over a −55˚C to 125˚C
temperature range while the LM285-1.2 is rated −40˚C to
85˚C and the LM385-1.2 0˚C to 70˚C. The LM185-1.2/
LM285-1.2 are available in a hermetic TO-46 package and
the LM285-1.2/LM385-1.2 are also available in a low-cost
TO-92 molded package, as well as SO and SOT-23. The
LM185-1.2 is also available in a hermetic leadless chip car-
rier package.
General Description
The LM185-1.2/LM285-1.2/LM385-1.2 are micropower
2-terminal band-gap voltage regulator diodes. Operating
over a 10 µA to 20 mA current range, they feature exception-
ally low dynamic impedance and good temperature stability.
On-chip trimming is used to provide tight voltage tolerance.
Since the LM185-1.2 band-gap reference uses only transis-
tors and resistors, low noise and good long term stability re-
sult.
Features
Careful design of the LM185-1.2 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.
±
±
%
4 mV ( 0.3 ) max. initial tolerance (A grade)
n
n Operating current of 10 µA to 20 mA
n 0.6Ω max dynamic impedance (A grade)
n Low temperature coefficient
n Low voltage reference — 1.235V
n 2.5V device and adjustable device also available
n LM185-2.5 series and LM185 series, respectively
The extremely low power drain of the LM185-1.2 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.
Connection Diagrams
SOT23
T0-92
Plastic Package (Z)
DS005518-33
*
Pin 3 is attached to the Die Attach Pad (DAP) and should be connected
to Pin 2 or left floating.
Order Number LM385M3-1.2
See NS Package Number MA03B
DS005518-10
Bottom View
Order Number LM285Z-1.2,
LM285BXZ-1.2, LM285BYZ-1.2
LM385Z-1.2, LM385BZ-1.2
LM385BXZ-1.2 or LM385BYZ-1.2
See NS Package Number Z03A
© 2000 National Semiconductor Corporation
DS005518
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Connection Diagrams (Continued)
SO Package
DS005518-9
Order Number LM285M-1.2,
LM285BXM-1.2, LM285BYM-1.2
LM385M-1.2, LM385BM-1.2
LM385BXM-1.2 or LM385BYM-1.2
See NS Package Number M08A
TO-46
Metal Can Package (H)
DS005518-6
Bottom View
Order Number LM185H-1.2, LM185H-1.2/883,
LM185BXH-1.2, LM185BYH-1.2
LM285H-1.2 or LM285BXH-1.2
See NS Package Number H02A
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature
Soldering Information
TO-92 package: 10 sec.
TO-46 package:10 sec.
SO and SOT Pkg.
−55˚C to +150˚C
260˚C
300˚C
(Note 2)
Vapor phase (60 sec.)
Infrared (15 sec.)
215˚C
220˚C
Reverse Current
Forward Current
Operating Temperature Range (Note 3)
LM185-1.2
30 mA
10 mA
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
0˚C to 70˚C
LM285-1.2
LM385-1.2
Electrical Characteristics (Note 4)
LM185-1.2
LM185BX-1.2
LM185BY-1.2
LM285-1.2
LM385B-1.2
LM385BX-1.2
LM385BY-1.2
LM385-1.2
Units
Parameter
Conditions
Typ
LM285BX-1.2
LM285BY-1.2
(Limit)
Tested
Design
Limit
Tested
Design
Limit
Tested
Design
Limit
Limit
Limit
Limit
(Notes
5, 8)
(Note 6)
(Note 5)
(Note 6)
(Note 5)
(Note 6)
=
Reverse Breakdown
Voltage
TA 25˚C,
1.235
8
1.223
1.247
10
1.223
1.247
15
1.205
1.260
15
V(Min)
V(Max)
µA
10 µA ≤ IR ≤ 20 mA
Minimum Operating
Current
20
1.5
20
20
1.5
25
20
15
LM385M3-1.2
10
(Max)
mV
Reverse Breakdown
Voltage Change
with Current
10 µA ≤ IR ≤ 1 mA
1
1
1
1.5
(Max)
mV
1 mA ≤ IR ≤ 20 mA
10
20
20
25
(Max)
Ω
=
=
Reverse Dynamic
Impedance
IR 100 µA, f 20 Hz
1
=
Wideband Noise
(rms)
IR 100 µA,
60
20
µV
10 Hz ≤ f ≤ 10 kHz
=
=
Long Term Stability
IR 100 µA, T 1000 Hr,
ppm
=
±
TA 25˚C 0.1˚C
=
Average Temperature
Coefficient (Note 7)
IR 100 µA
X Suffix
Y Suffix
All Others
30
50
30
50
ppm/˚C
ppm/˚C
ppm/˚C
(Max)
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 in-
tended 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-1.2 for military specifications.
Note 3: For elevated temperature operation, T max is:
j
LM185 150˚C
LM285 125˚C
LM385 100˚C
Thermal Resistance
TO-92
180˚C/W (0.4" leads)
170˚C/W (0.125" leads)
N/A
TO-46
SO-8
SOT23
θJA (junction to ambient)
440˚C/W
165˚C/W
283˚C/W
θJC (junction to case)
80˚C/W
N/A
N/A
=
=
25˚C.
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
T
A
J
3
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Electrical Characteristics (Note 4) (Continued)
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
MIN
MAX
Note 8: A military RETS electrical specification is available on request.
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
Forward Characteristics
DS005518-13
DS005518-14
DS005518-15
Temperature Drift of 3
Representative Units
Reverse Dynamic Impedance
Reverse Dynamic Impedance
DS005518-18
DS005518-17
DS005518-16
Noise Voltage
Filtered Output Noise
Response Time
DS005518-20
DS005518-19
DS005518-21
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4
Typical Applications
Wide Input
Range Reference
Micropower Reference
from 9V Battery
Reference from
1.5V Battery
DS005518-22
DS005518-23
DS005518-8
*
*
Micropower 10V Reference
Micropower 5V Regulator
DS005518-25
*I
20 µA standby current
Q
DS005518-24
*I
30 µA
Q
Precision 1 µA to 1 mA Current Sources
DS005518-27
DS005518-26
5
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Typical Applications (Continued)
METER THERMOMETERS
Lower Power Thermometer
0˚C−100˚C Thermometer
DS005518-29
*2N3638 or 2N2907 select for inverse H
5
FE
†
‡
Select for operation at 1.3V
600 µA to 900 µA
I
Q
DS005518-28
Calibration
=
1. Short LM385-1.2, adjust R3 for I
temp at 1 µA/˚K
OUT
2. Remove short, adjust R2 for correct reading in centigrade
†
I
at 1.3V 500 µA
Q
I
Q
at 1.6V 2.4 mA
0˚F−50˚F Thermometer
Micropower Thermocouple Cold Junction
Compensator
DS005518-30
Calibration
=
1. Short LM385-1.2, adjust R3 for I
temp at 1.8 µA/˚K
OUT
DS005518-31
2. Remove short, adjust R2 for correct reading in ˚F
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
(µV/˚C)
R1
R2
Voltage
Voltage
Across R2
(mV)
(Ω) (Ω)
Across R1
@
25˚C
(mV)
15.60
12.77
12.17
1.908
J
T
K
S
52.3
42.8
40.8
6.4
523 1.24k
14.32
11.78
11.17
1.766
432
1k
412 953Ω
63.4 150Ω
Typical supply current 50 µA
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6
Typical Applications (Continued)
Centigrade Thermometer
DS005518-1
Calibration
=
1. Adjust R1 so that V1 temp at 1 mV/˚K
2. Adjust V2 to 273.2 mV
†
I
for 1.3V to 1.6V battery volt-
Q
=
age 50 µA to 150 µA
Schematic Diagram
DS005518-7
7
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Physical Dimensions inches (millimeters) unless otherwise noted
TO-46 Metal Can Package (H)
Order Number LM185H-1.2, LM185H-1.2/883, LM185BXH-1.2, LM185BYH-1.2, LM285H-1.2, or LM285BXH-1.2
NS Package Number H02A
SOT-23 Package (M3)
Order Number LM385M3-1.2
NS Package Number MA03B
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8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Small Outline (SO-8) Package
Order Number LM285M-1.2, LM285BXM-1.2, LM285BYM-1.2
LM385M-1.2, LM385BM-1.2, LM385BXM-1.2, LM385BYM-1.2
NS Package Number M08A
TO-92 Plastic Package (Z)
Order Number LM285Z-1.2, LM285BXZ-1.2
LM285BYZ-1.2, LM385Z-1.2, LM385BZ-1.2
LM385BXZ-1.2 or LM385BYZ-1.2
NS Package Number Z03A
9
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Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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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.
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