LM185BYH2.5/883C [NSC]
IC,VOLT REFERENCE,FIXED,2.5V,BIPOLAR,SIP,2PIN,METAL;
| 型号： | LM185BYH2.5/883C |
| 厂家： | 
National Semiconductor |
| 描述： | IC,VOLT REFERENCE,FIXED,2.5V,BIPOLAR,SIP,2PIN,METAL 二极管 |
| 文件： | 总14页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
December 1999
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 car-
rier 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 exception-
ally 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 transis-
tors and resistors, low noise and good long term stability re-
sult.
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.
±
±
20 mV ( 0.8%) max. initial tolerance (A grade)
n
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 ref-
erences with a tighter tolerance part. For applications requir-
ing 1.2V see LM185-1.2.
Connection Diagrams
TO-92
SO Package
Plastic Package
DS005519-8
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
DS005519-11
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
DS005519-29
*
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
© 1999 National Semiconductor Corporation
DS005519
www.national.com
Connection Diagrams (Continued)
LCC
Leadless Chip Carrier
DS005519-14
Order Number LM185E-2.5/883
See NS Package Number E20A
TO-46
Metal Can Package
DS005519-13
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
www.national.com
2
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Soldering Information
TO-92 Package (10 sec.)
TO-46 Package (10 sec.)
SO and SOT Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
260˚C
300˚C
Reverse Current
Forward Current
Operating Temperature Range (Note 3)
LM185-2.5
30 mA
10 mA
215˚C
220˚C
−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.
LM285-2.5
LM385-2.5
Storage Temperature
−55˚C to + 150˚C
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,
0.2
0.6
=
f
20 Hz
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
IMIN ≤ IR ≤ 20 mA
X Suffix
Average Temperature
Coefficient (Note 7)
30
50
ppm/˚C
(Max)
Y Suffix
All Others
150
3
www.national.com
Electrical Characteristics (Continued)
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 Tested Design
Limit Limit Limit Limit Limit
(Note 6) (Note 5) (Note 6) (Note 5) (Note 6)
(Note 5)
(Note 8)
2.462
=
Reverse Breakdown
Voltage
TA 25˚C,
2.5
13
2.462
2.538
20
2.425
2.575
20
V(Min)
V(Max)
20 µA ≤ IR ≤ 20 mA
2.538
Minimum Operating
Current
20
30
30
30
20
µA
(Max)
LM385M3-2.5
15
Reverse Breakdown
Voltage Change with
Current
20 µA ≤ IR ≤ 1 mA
1
1.5
20
2.0
20
2.5
25
2.0
2.5
mV
(Max)
1 mA ≤ IR ≤ 20 mA
10
20
25
mV
(Max)
=
Reverse Dynamic
Impedance
IR 100 µA,
1
Ω
=
f
20 Hz
=
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)
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-2.5 for military specifications.
Note 3: For elevated temperature operation, T
is:
MAX
J
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)
170˚C/W (0.125" Leads)
N/A
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
Note 5: Guaranteed and 100% production tested.
T
J
A
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
MIN MAX
–T . The measured temperatures are −55˚C, −40˚C, 0˚C, 25˚C, 70˚C, 85˚C, 125˚C.
MIN
Note 8: A military RETS electrical specification available on request.
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4
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
Forward Characteristics
DS005519-16
DS005519-17
DS005519-15
Temperature Drift
Reverse Dynamic
Impedance
Reverse Dynamic
Impedance
DS005519-18
DS005519-19
DS005519-20
Noise Voltage
Filtered Output Noise
Response Time
DS005519-22
DS005519-23
DS005519-21
Applications
Wide Input Range Reference
Micropower Reference from 9V Battery
DS005519-2
DS005519-12
LM385-2.5 Applications
5
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LM385-2.5 Applications (Continued)
Micropower 10V Reference (Note 10)
Micropower 5V Reference (Note 9)
DS005519-10
Note 10:
I
Q
30 µA standby current
DS005519-9
Note 9:
I
Q
40 µA
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6
LM385-2.5 Applications (Continued)
Precision 1 µA to 1 mA Current Sources
DS005519-25
DS005519-24
METER THERMOMETERS
0˚C–100˚C Thermomemter
0˚F–50˚F Thermomemter
DS005519-26
DS005519-27
Calibration
Calibration
=
1. Short LM385-2.5, adjust R3 for IOUT temp at 1µA/˚K
=
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
2. Remove short, adjust R2 for correct reading in centi-
grade
7
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LM385-2.5 Applications (Continued)
Micropower Thermocouple Cold Junction
Compensator
DS005519-6
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.
Seebeck
Voltage
Voltage
Across R2
(mV)
Thermocouple
Type
Co-
R1
R2
Across R1
@
25˚C
efficient (Ω)
(Ω)
(µV/˚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
432 1k
14.32
11.78
11.17
1.766
412 953Ω
63.4 150Ω
Typical supply current 50 µA
Improving Regulation of Adjstable Regulators
DS005519-7
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8
Schematic Diagram
DS005519-1
9
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Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM185E-2.5/883
NS Package Number E20A
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10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
SOT-23 Package (M3)
Order Number LM385M3-2.5
NS Package Number MA03B
www.national.com
12
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
13
www.national.com
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
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