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Part: LM285M
Category:
Power Management
-> Voltage References
-> Shunt
Description: LM285-ADJ - Adjustable Micropower Voltage Reference, Package: Soic Narrow, Pin Nb=8
Company: National Semiconductor Corporation
Datasheet: Download LM285M datasheet File size : 634 kB
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Datasheet text preview:
LM185/LM285/LM385 Adjustable Micropower Voltage Reference
February 2000
LM185/LM285/LM385 Adjustable Micropower Voltage References
General Description
The LM185/LM285/LM385 are micropower 3-terminal adjustable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and over a 10µA to 20mA current range, they feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming is used to provide tight voltage tolerance. Since the LM185 band-gap reference uses only transistors and resistors, low noise and good long-term stability result. Careful design of the LM185 has made the device 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 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 is rated for operation over a -55°C to 125°C temperature range, while the LM285 is rated -40°C to 85°C and the LM385 0°C to 70°C. The LM185 is available in a hermetic TO-46 package and a leadless chip carrier package, while the LM285/LM385 are available in a low-cost TO-92 molded package, as well as S.O.
Features
n n n n n Adjustable from 1.24V to 5.30V Operating current of 10µA to 20mA 1% and 2% initial tolerance 1 dynamic impedance Low temperature coefficient
Connection Diagrams
TO-92 Plastic Package
SOIC Package
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Bottom View TO-46 Metal Can Package
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Top View 20-Leadless Chip Carrier
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Bottom View
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Top View
© 2000 National Semiconductor Corporation
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LM185/LM285/LM385
Ordering Information
Package -55°C to 125°C LM185BH TO-46 LM185BH/883 LM185BYH LM185BYH/883 LM285BXZ TO-92 LM285BYZ LM285Z LM285M LM285BYM LM185BE/883 LM385BXZ LM385BYZ LM385BZ LM385Z 8-Pin SOIC 20-Leadless Chip Carrier LM385M LM385BM M08A E20A Z03A H03H Temperature Range -40°C to 85°C 0°C to 70°C NSC Drawing
Block Diagram
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Typical Applications
1.2V Reference 5.0V Reference
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LM185/LM285/LM385
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 2) Reverse Current Forward Current Operating Temperature Range (Note 3) LM185 Series LM285 Series LM385 Series 30mA 10mA -55°C to 125°C -40°C to 85°C 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 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)
LM185, LM285 LM185BX, LM185BY LM185B, LM285BX, Typ LM285BY Tested Limit (Note 5) Reference Voltage IR = 100µA 1.240 1.252 1.255 1.228 1.215 Reference Voltage Change with Current Dynamic Output Impedance IMIN < IR < 1mA 1mA < IR < 20mA IR = 100µA, IAC = 0.1 IR f = 100Hz VOUT = VREF VOUT = 5.3V Reference Voltage Change with Output Voltage Feedback Current Minimum Operating Current (see curve) Output Wideband Noise VOUT = VREF VOUT = 5.3V IR = 100µA, 10Hz < f < 10kHz VOUT = VREF VOUT = 5.3V Average Temperature Coefficient (Note 7) IR = 100µA X Suffix Y Suffix All Others Long Term Stability IR = 100µA, T = 1000 Hr, TA = 25°C ± 0.1°C 20 50 170 30 50 150 150 20 50 170 30 50 150 150 ppm ppm/°c (max) µVrms 13 6 30 20 9 45 25 10 50 20 9 45 25 10 50 16 7 35 30 11 55 35 13 60 30 11 55 35 13 60 nA (max) µA (max) IR = 100µA 1 3 6 3 6 2 5 10 5 10 0.3 0.7 0.4 1 mV (max) 0.2 4 1 10 1.5 20 1 10 1.5 20 0.2 5 1 15 1.5 25 1 15 1.5 25 1.215 1.205 1.228 1.215 1.215 1.205 Design Limit (Note 6) Tested Limit (Note 5) 1.265 Design Limit (Note 6) 1.270 1.240 LM285 Typ Tested Limit (Note 5) 1.252 Design Limit (Note 6) 1.255 Tested Limit (Note 5) 1.265 Design Limit (Note 6) 1.270 V (max) V (min) mV (max) LM385 LM385BX, LM385BY LM385 Units (Limit)
Parameter
Conditions
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 for military specifications. Note 3: For elevated temperature operation, TJmax is:
LM185 LM285 LM385 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 80°C/W N/A TO-46 440°C/W SO-8 165°C/W
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LM185/LM285/LM385
Electrical Characteristics (Note 4)
Note 5: Guaranteed and 100% production tested.
(Continued)
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Unless otherwise specified, all parameters apply for VREF < VOUT < 5.3V. Note 6: Guaranteed, but not 100% production tested. These limits are not to be 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 from TMIN to TMAX, divided by TMAX - TMIN. The measured temperatures are -55, -40, 0, 25, 70, 85, 125°C.
Typical Performance Characteristics
Temperature Drift of 3 Representative Units Feedback Current Minimum Operating Current
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Reverse Characteristics
Reverse Characteristics
Forward Characteristics
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Output Noise Voltage
Dynamic Output Impedance
Response Time
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LM185/LM285/LM385
Typical Performance Characteristics
Temperature Coefficient Typical LM185
(Continued)
LM285
LM385
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Typical Applications
Precision 10V Reference Low AC Noise Reference
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25V Low Current Shunt Regulator
200 mA Shunt Regulator
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