LM285BXZ

LM185/LM285/LM385 Adjustable Micropower Voltage Reference January 30, 2008 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 ■ ■ ■ ■ ■ Adjustable from 1.24V to 5.30V Operating current of 10μA to 20mA 1% and 2% initial tolerance 1Ω dynamic impedance Low temperature coefficient Connection Diagrams TO-92 Plastic Package TO-46 Metal Can Package 525009 Bottom View SOIC Package 525001 Bottom View 20-Leadless Chip Carrier 525010 Top View Top View 525015 © 2008 National Semiconductor Corporation 5250 www.national.com LM185/LM285/LM385 Ordering Information Package −55°C to 125°C −40°C to 85°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 0°C to 70°C NSC Drawing Block Diagram 525013 Typical Applications 1.2V Reference 5.0V Reference 525014 525002 www.national.com 2 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 (Note 4) LM185, LM285 LM185BX, LM185BY LM185B, LM285BX, LM285BY ESD Susceptibility (Note 8) 2kV 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 LM385 LM385BX, LM285 Typ Tested Design Tested Design Limit Limit Limit Limit (Note (Note (Note (Note 5) 6) 5) 6) 1.240 1.252 1.255 1.265 1.270 V (max) V (min) mV (max) LM385BY LM385 Units (Limit) Parameter Conditions Typ Tested Design Tested Design Limit Limit Limit Limit (Note (Note (Note (Note 5) 6) 5) 6) 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 IR = 100μA 1 3 6 3 6 2 0.2 4 1 10 1.5 20 1.265 1.270 1.215 1 10 1.205 1.5 20 0.2 5 1.228 1 15 1.215 1.5 25 1.215 1 15 1.205 1.5 25 0.3 0.7 0.4 1 Ω mV 5 10 5 10 (max) 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) 50 170 50 170 μVrms 3 www.national.com LM185/LM285/LM385 LM185, LM285 LM185BX, LM185BY LM185B, LM285BX, LM285BY LM385 LM385BX, LM285 Typ Tested Design Tested Design Limit Limit Limit Limit (Note (Note (Note (Note 5) 6) 5) 6) 30 50 ppm/° c (max) 150 20 150 ppm LM385BY LM385 Units (Limit) Parameter Conditions Typ Tested Design Tested Design Limit Limit Limit Limit (Note (Note (Note (Note 5) 6) 5) 6) 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 30 50 150 150 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 Thermal Resistance θJA (Junction to Ambient) θJC (Junction to Case) 150°C 125°C 100°C 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 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 5: Guaranteed and 100% production tested. 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. Note 8: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. www.national.com 4 LM185/LM285/LM385 Typical Performance Characteristics Temperature Drift of 3 Representative Units Feedback Current 525017 525016 Minimum Operating Current Reverse Characteristics 525018 525019 Reverse Characteristics Forward Characteristics 525020 525021 5 www.national.com LM185/LM285/LM385 Output Noise Voltage Dynamic Output Impedance 525022 525023 Response Time 525024 Temperature Coefficient Typical LM185 LM285 LM385 525004 www.national.com 6 LM185/LM285/LM385 Typical Applications Precision 10V Reference Low AC Noise Reference 525025 525026 25V Low Current Shunt Regulator 200 mA Shunt Regulator 525027 525028 7 www.national.com LM185/LM285/LM385 Series-Shunt 20 mA Regulator High Efficiency Low Power Regulator 525029 525030 Voltage Level Detector Voltage Level Detector 525031 525032 Fast Positive Clamp 2.4V + ΔVD1 Bidirectional Clamp ±2.4V 525034 525033 www.national.com 8 LM185/LM285/LM385 Bidirectional Adjustable Clamp ±1.8V to ±2.4V Bidirectional Adjustable Clamp ±2.4V to ±6V 525035 525036 Simple Floating Current Detector Current Source 525038 525037 Precision Floating Current Detector 525039 9 www.national.com LM185/LM285/LM385 *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, 10mV/°C Freezer Alarm 525011 525012 Schematic Diagram 525008 www.national.com 10 LM185/LM285/LM385 Physical Dimensions inches (millimeters) unless otherwise noted 20-Leadless Chip Carrier (E) NS Package Number E20A TO-46 Metal Can Package (H) NS Package Number H03H 11 www.national.com LM185/LM285/LM385 SO Package (M) NS Package Number M08A TO-92 Plastic Package (Z) NS Package Number Z03A www.national.com 12 LM185/LM285/LM385 Notes 13 www.national.com LM185/LM285/LM385 Adjustable Micropower Voltage Reference Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers Audio Clock Conditioners Data Converters Displays Ethernet Interface LVDS Power Management Switching Regulators LDOs LED Lighting PowerWise Serial Digital Interface (SDI) Temperature Sensors Wireless (PLL/VCO) www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/displays www.national.com/ethernet www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/powerwise www.national.com/sdi www.national.com/tempsensors www.national.com/wireless WEBENCH Analog University App Notes Distributors Green Compliance Packaging Design Support www.national.com/webench www.national.com/AU www.national.com/appnotes www.national.com/contacts www.national.com/quality/green www.national.com/packaging www.national.com/quality www.national.com/refdesigns www.national.com/feedback Quality and Reliability Reference Designs Feedback THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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