NSC LM385Z-1.2, LM385MX-1.2, LM385M3-1.2, LM385BXM-1.2, LM385BMX-1.2 Datasheet

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LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode
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 µAto20mAcurrent range, they feature exception­ally 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 transis­tors and resistors, low noise and good long term stability re­sult.
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.
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 car­rier package.
Features
n
±
4mV(±0.3%) max. initial tolerance (A grade)
n Operating current of 10 µA to 20 mA n 0.6max 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
Connection Diagrams
T0-92
Plastic Package (Z)
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
SOT23
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
January 2000
LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode
© 2000 National Semiconductor Corporation DS005518 www.national.com
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
LM185-1.2/LM285-1.2/LM385-1.2
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Absolute Maximum Ratings (Note 1)
(Note 2) Reverse Current 30 mA
Forward Current 10 mA
Operating Temperature Range (Note 3)
LM185-1.2 −55˚C to +125˚C LM285-1.2 −40˚C to +85˚C LM385-1.2 0˚C to 70˚C
Storage Temperature −55˚C to +150˚C Soldering Information
TO-92 package: 10 sec. 260˚C TO-46 package:10 sec. 300˚C
SO and SOT Pkg.
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)
LM185-1.2 LM185BX-1.2 LM385B-1.2 LM185BY-1.2 LM385BX-1.2 LM385-1.2
LM285-1.2 LM385BY-1.2 Units
Parameter Conditions Typ LM285BX-1.2 (Limit)
LM285BY-1.2
Tested Design Tested Design Tested Design
Limit Limit Limit Limit Limit Limit
(Notes
5, 8)
(Note 6) (Note 5) (Note 6) (Note 5) (Note 6)
Reverse Breakdown T
A
=
25˚C, 1.235 1.223 1.223 1.205 V(Min)
Voltage 10 µA I
R
20 mA 1.247 1.247 1.260 V(Max) Minimum Operating 8 10 20 15 20 15 20 µA Current LM385M3-1.2 10 15 (Max) Reverse Breakdown 10 µA I
R
1mA 1 1.5 1 1.5 1 1.5 mV Voltage Change (Max) with Current 1 mA I
R
20 mA 10 20 20 25 20 25 mV
(Max)
Reverse Dynamic I
R
=
100 µA, f=20 Hz 1 Impedance Wideband Noise I
R
=
100 µA, 60 µV (rms) 10 Hz f 10 kHz Long Term Stability I
R
=
100 µA, T=1000 Hr, 20 ppm
T
A
=
25˚C
±
0.1˚C
Average Temperature I
R
=
100 µA Coefficient (Note 7) 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 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-1.2 for military specifications. Note 3: For elevated temperature operation, T
j
max is: LM185 150˚C LM285 125˚C LM385 100˚C
Thermal Resistance TO-92 TO-46 SO-8 SOT23
θ
JA
(junction to ambient) 180˚C/W (0.4" leads) 440˚C/W 165˚C/W 283˚C/W
170˚C/W (0.125" leads)
θ
JC
(junction to case) N/A 80˚C/W N/A N/A
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
A
=
T
J
=
25˚C.
LM185-1.2/LM285-1.2/LM385-1.2
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