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Part: LM285M-2.5
Category:
Power Management
-> Voltage References
-> Shunt
Description: LM285-2.5 - Micropower Voltage Reference Diode, Package: Soic Narrow, Pin Nb=8
Company: National Semiconductor Corporation
Datasheet: Download LM285M-2.5 datasheet File size : 634 kB
Request For quote: Find where to buy LM285M-2.5
Datasheet text preview:
LM185-2.5/LM285-2.5/LM385-2.5 Micropower Voltage Reference Diode
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 exceptionally 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 transistors and resistors, low noise and good long term stability result. Careful design of the LM185-2.5 has made the device exceptionally 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. Further, the wide operating current allows it to replace older references with a tighter tolerance part. For applications requiring 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 carrier package.
Features
n n n n n n
± 20 mV ( ± 0.8%) max. initial tolerance (A grade) Operating current of 20 µA to 20 mA 0.6 dynamic impedance (A grade) Low temperature coefficient Low voltage reference -- 2.5V 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
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
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LM185-2.5/LM285-2.5/LM385-2.5
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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LM185-2.5/LM285-2.5/LM385-2.5
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) LM385A-2.5 LM385AX-2.5 Parameter Conditions Typ LM385AY-2.5 Tested Limit (Note 5) Reverse Breakdown Voltage 2.500 Minimum Operating Current Reverse Breakdown Voltage Change with Current Reverse Dynamic Impedance Wideband Noise (rms) Long Term Stability 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 Average Temperature Coefficient (Note 7) IMIN IR 20 mA X Suffix Y Suffix All Others 30 50 150 ppm/°C (Max) 20 ppm 0.2 120 10 20 0.6 1.5 µV IMIN IR 1mA 1 1.5 12 18 IR = 100 µA 2.500 2.480 2.520 2.470 2.530 20 Design Limit (Note 6) V(Min) V(Max) V(Min) V(Max) µA (Max) mV (Max) mV (Max) Units (Limits)
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LM185-2.5/LM285-2.5/LM385-2.5
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 (Note 5) (Note 8) Design Limit (Note 6) Tested Limit (Note 5) 2.462 2.538 30 1.5 20 20 2.0 20 30 2.5 25 Design Limit (Note 6) Tested Limit (Note 5) 2.425 2.575 20 15 1 10 2.0 20 30 20 2.5 25 Design Limit (Note 6) V(Min) V(Max) µA (Max) mV (Max) mV (Max) µV
Reverse Breakdown Voltage Minimum Operating Current Reverse Breakdown Voltage Change with Current Reverse Dynamic Impedance Wideband Noise (rms) Long Term Stability
TA = 25°C, 20 µA IR 20 mA
2.5 13
2.462 2.538 20
LM385M3-2.5 20 µA IR 1 mA 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 IR = 100 µA X Suffix Y Suffix All Others 20 1 120
ppm
Average Temperature Coefficient (Note 7)
30 50 150
30 50 150 150
ppm/°C ppm/°C 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-2.5 for military specifications. LM185 LM285 LM385 Note 3: For elevated temperature operation, TJ MAX is: 150°C 125°C 100°C
Thermal Resistance ja (Junction to Ambient) jc (Junction to Case)
TO-92 180°C/W (0.4" Leads) 170°C/W (0.125" Leads) N/A
TO-46 440°C/W 80°C/W
SO-8 165°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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LM185-2.5/LM285-2.5/LM385-2.5
Typical Performance Characteristics
Reverse Characteristics Reverse Characteristics Forward Characteristics
DS005519-15
DS005519-16
DS005519-17
Temperature Drift
Reverse Dynamic Impedance
Reverse Dynamic Impedance
DS005519-18 DS005519-19 DS005519-20
Noise Voltage
Filtered Output Noise
Response Time
DS005519-21
DS005519-22
DS005519-23
Applications
Wide Input Range Reference Micropower Reference from 9V Battery
DS005519-2 DS005519-12
LM385-2.5 Applications
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