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| LM185/285/385 Adjustable Micropower Voltage Reference June 1999 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 10 A 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 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 -55C to 125C temperature range, while the LM285 is rated -40C to 85C and the LM385 0C to 70C. 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 10 A to 20 mA 1% and 2% initial tolerance 1 dynamic impedance Low temperature coefficient Connection Diagrams TO-92 Plastic Package TO-46 Metal Can Package DS005250-9 Bottom View Order Number LM285BXZ, LM285BYZ, LM285Z, LM385BXZ, LM385BYZ, LM385BZ or LM385Z See NS Package Number Z03A DS005250-1 Bottom View Order Number LM185BH, LM185BH/883, LM185BYH or LM185BYH/883 See NS Package Number H03H SO Package DS005250-10 Order Number LM285M, LM285BYM, LM385BM or LM385M See NS Package Number M08A (c) 1999 National Semiconductor Corporation DS005250 www.national.com Block Diagram DS005250-13 Typical Applications 1.2V Reference 5.0V Reference DS005250-14 DS005250-2 www.national.com 2 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 30 mA 10 mA -55C to 125C -40C to 85C 0C to 70C Storage Temperature -55C to 150C Soldering Information TO-92 Package (10 sec.) 260C TO-46 Package (10 sec.) 300C SO Package Vapor Phase (60 sec.) 215C Infrared (15 sec.) 220C 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 = 100 A 1.240 1.252 1.255 1.228 1.215 Reference Voltage Change with Current Dynamic Output Impedance IMIN < IR 1 mA 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) 1.5 20 1 10 1.5 20 0.2 5 1 15 1.5 25 1 15 1.5 25 mV (max) LM385 LM385BX, LM385BY LM385 Units (Limit) Parameter Conditions < 1 mA f = 100 Hz VOUT = VREF VOUT = 5.3V 0.2 4 1 10 < IR < 20 mA IR = 100 A,, IAC = 0.1 IR 0.3 0.7 0.4 1 Reference Voltage Change with Output Voltage Feedback Current Minimum Operating Current (see curve) Output Wideband Noise IR = 100 A 1 3 6 3 6 2 5 10 5 10 mV (max) 13 VOUT = VREF VOUT = 5.3V IR = 100 A, 10 Hz kHz VOUT = VREF VOUT = 5.3V 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) A (max) < f < 10 50 170 50 170 30 50 150 20 150 20 30 50 150 150 ppm ppm/c (max) Vrms Average Temperature Coefficient (Note 7) IR = 100 A X Suffix Y Suffix All Others Long Term Stability IR = 100 A, T = 1000 Hr, TA = 25C 0.1C 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 150C 125C 100C Thermal Resistance ja (Junction to Ambient) jc (Junction to Case) TO-92 180C/W (0.4" leads) 170C/W (0.125" leads) N/A 80C/W N/A TO-46 440C/W SO-8 165C/W 3 www.national.com 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 = 25C. 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, 125C. Typical Performance Characteristics Temperature Drift of 3 Representative Units Feedback Current Minimum Operating Current DS005250-17 DS005250-16 DS005250-18 Reverse Characteristics Reverse Characteristics Forward Characteristics DS005250-19 DS005250-20 DS005250-21 Output Noise Voltage Dynamic Output Impedance Response Time DS005250-22 DS005250-23 DS005250-24 www.national.com 4 Typical Performance Characteristics Temperature Coefficient Typical LM185 (Continued) LM285 LM385 DS005250-4 Typical Applications Precision 10V Reference Low AC Noise Reference DS005250-25 DS005250-26 25V Low Current Shunt Regulator 200 mA Shunt Regulator DS005250-27 DS005250-28 5 www.national.com Typical Applications (Continued) High Efficiency Low Power Regulator Series-Shunt 20 mA Regulator DS005250-29 DS005250-30 Voltage Level Detector Voltage Level Detector DS005250-31 DS005250-32 Fast Positive Clamp 2.4V + VD1 Bidirectional Clamp 2.4V DS005250-34 DS005250-33 www.national.com 6 Typical Applications (Continued) Bidirectional Adjustable Clamp 2.4V to 6V Bidirectional Adjustable Clamp 1.8V to 2.4V DS005250-35 DS005250-36 Simple Floating Current Detector Current Source DS005250-38 DS005250-37 7 www.national.com Typical Applications (Continued) Precision Floating Current Detector DS005250-39 *D1 can be any LED, VF = 1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if ITHRESHOLD falls below the threshold current, except with I = O. Centigrade Thermometer, 10 mV/C Freezer Alarm DS005250-11 DS005250-12 www.national.com 8 Schematic Diagram DS005250-8 Connection Diagrams DS005250-15 Order Number LM185BE/883 See NS Package Number E20A 9 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 20-Leadless Chip Carrier (E) Order Number LM185BE/883 NS Package Number E20A TO-46 Metal Can Package (H) Order Number LM185BH, LM185BH/883, LM185BYH or LM185BYH/883 NS Package Number H03H www.national.com 10 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SO Package (M) Order Number LM285M, LM285BYM, LM385BM or LM385M NS Package Number M08A TO-92 Plastic Package (Z) Order Number LM385BZ, LM385Z, LM385BXZ, LM385BYZ, LM285Z, LM285BXZ or LM285BYZ NS Package Number Z03A 11 www.national.com LM185/285/385 Adjustable Micropower Voltage Reference Notes LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. |
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