LM185-2.5 Datasheet PDF - National Semiconductor


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LM185-2.5
National Semiconductor

Part Number LM185-2.5
Description Micropower Voltage Reference Diode
Page 14 Pages

LM185-2.5 datasheet pdf
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December 1999
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 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.
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.
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.
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.
Features
n ±20 mV (±0.8%) max. initial tolerance (A grade)
n Operating current of 20 µA to 20 mA
n 0.6dynamic 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
Connection Diagrams
TO-92
Plastic Package
SO 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
SOT-23
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
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
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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
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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.
Reverse Current
Forward Current
Operating Temperature Range (Note 3)
LM185-2.5
LM285-2.5
LM385-2.5
Storage Temperature
30 mA
10 mA
−55˚C to + 125˚C
−40˚C to + 85˚C
0˚C to 70˚C
−55˚C to + 150˚C
Soldering Information
TO-92 Package (10 sec.)
260˚C
TO-46 Package (10 sec.)
300˚C
SO and SOT Package
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
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
Conditions
Reverse Breakdown
Voltage
Minimum Operating
Current
Reverse Breakdown
Voltage Change with
Current
Reverse Dynamic
Impedance
Wideband Noise (rms)
Long Term Stability
Average Temperature
Coefficient (Note 7)
IR = 100 µA
IMIN IR 1mA
1 mA IR 20 mA
IR = 100 µA,
f = 20 Hz
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
Y Suffix
All Others
Typ
2.500
2.500
12
0.2
120
20
LM385A-2.5
LM385AX-2.5
LM385AY-2.5
Tested
Design
Limit
Limit
(Note 5)
(Note 6)
2.480
2.520
2.470
2.530
18 20
1 1.5
10 20
0.6
1.5
30
50
150
Units
(Limits)
V(Min)
V(Max)
V(Min)
V(Max)
µA
(Max)
mV
(Max)
mV
(Max)
µV
ppm
ppm/˚C
(Max)
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Electrical Characteristics (Continued)
LM185-2.5
LM185BX-2.5
LM385B-2.5
LM185BY-2.5
LM385BX-2.5
LM385-2.5
Units
LM285-2.5
LM385BY-2.5
(Limit)
Parameter
Conditions Typ LM285BX-2.5
LM285BY-2.5
Tested Design Tested Design Tested Design
Limit
Limit Limit Limit Limit Limit
(Note 5) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6)
(Note 8)
Reverse Breakdown
Voltage
Minimum Operating
Current
TA = 25˚C,
20 µA IR 20 mA
LM385M3-2.5
2.5
13
2.462
2.538
20
2.462
2.425
V(Min)
2.538
2.575
V(Max)
30 20 30 20 30 µA
15 20 (Max)
Reverse Breakdown
Voltage Change with
Current
20 µA IR 1 mA
1 mA IR 20 mA
1 1.5 2.0 2.5 2.0 2.5 mV
(Max)
10 20 20 25 20 25 mV
(Max)
Reverse Dynamic
Impedance
IR = 100 µA,
f = 20 Hz
1
Wideband Noise (rms)
IR = 100 µA,
10 Hz f 10 kHz
120
µV
Long Term Stability
IR = 100 µA,
T = 1000 Hr,
20
ppm
Average Temperature
Coefficient (Note 7)
TA = 25˚C ±0.1˚C
IR = 100 µA
X Suffix
30
30
ppm/˚C
Y Suffix
50 50
ppm/˚C
All Others
150 150 150 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 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, TJ MAX is:
LM185
150˚C
LM285
125˚C
LM385
100˚C
Thermal Resistance
θja (Junction to Ambient)
θjc (Junction to Case)
TO-92
180˚C/W (0.4" Leads)
170˚C/W (0.125" Leads)
N/A
TO-46
SO-8
440˚C/W 165˚C/W
80˚C/W
N/A
SOT-23
283˚C/W
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.
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