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LM185-ADJ,LM285-ADJ,LM385-ADJ LM185/LM285/LM385 Adjustable Micropower Voltage References Literature Number: SNVS741E
January 30, 2008 LM185/LM285/LM385 Adjustable Micropower Voltage References General Description The LM185/LM285/LM385 are micropower 3-terminal ad- justable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and over a 10 μA to 20mA current range, they feature exceptionally low dynamic impedance and good tem- perature 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 refer- ence 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 ana- log 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 tem- perature 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 525009 Bottom View TO-46 Metal Can Package 525001 Bottom View 525010 Top View 20-Leadless Chip Carrier 525015 Top View © 2008 National Semiconductor Corporation 5250 www.national.com LM185/LM285/LM385 Adjustable Micropower Voltage Reference
Ordering Information
Package Temperature Range NSC Drawing −55°C to 125°C −40°C to 85°C 0°C to 70°C TO-46 LM185BH H03HLM185BH/883 LM185BYH LM185BYH/883 TO-92 LM285BXZ LM385BXZ Z03A LM285BYZ LM385BYZ LM285Z LM385BZ LM385Z 8-Pin SOIC LM285M LM385M M08A LM285BYM LM385BM 20-Leadless Chip Carrier LM185BE/883 E20A Block Diagram 525013 Typical Applications 1.2V Reference 525014 5.0V Reference 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 30mA Forward Current 10mA Operating Temperature Range (Note 3) LM185 Series −55°C to 125°C LM285 Series −40°C to 85°C LM385 Series 0°C to 70°C ESD Susceptibility (Note 8) 2kV Storage Temperature −55°C to 150°C Soldering Information 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) Parameter Conditions LM185, LM285 LM385 Typ LM185BX, LM185BY Typ LM385BX, LM185B, LM285BX, LM285 LM385BY LM385 Units LM285BY (Limit) Tested Design Tested Design Tested Design Tested Design Limit Limit Limit Limit Limit Limit Limit Limit (Note (Note (Note (Note (Note (Note (Note (Note Reference Voltage 1.255 (max) 1.215 (min) Reference Voltage Change with Current 1mA < IR < 20mA 4 10 20 10 20 5 15 25 15 25 (max) Dynamic Output IR = 100μA, f = 100Hz Impedance IAC = 0.1 IR VOUT = VREF 0.3 0.4 Ω VOUT = 5.3V 0.7 1 Reference Voltage IR = 100μA mV Change with Output 1 3 6 3 6 2 5 10 5 10 (max) Voltage Feedback Current 13 20 25 20 25 16 30 35 30 35 nA (max) Minimum Operating VOUT = VREF 6 9 10 9 10 7 11 13 11 13 μA Current (see curve) VOUT = 5.3V 30 45 50 45 50 35 55 60 55 60 (max) Output Wideband IR = 100μA, 10Hz < f < 10kHz Noise VOUT = VREF 50 50 μVrms VOUT = 5.3V 170 170 3 www.national.com LM185/LM285/LM385
LM185, LM285 LM385 Typ LM185BX, LM185BY Typ LM385BX, LM185B, LM285BX, LM285 LM385BY LM385 Units LM285BY (Limit) Tested Design Tested Design Tested Design Tested Design Limit Limit Limit Limit Limit Limit Limit Limit (Note (Note (Note (Note (Note (Note (Note (Note Average Temperature IR = 100μA X Suffix 30 30 ppm/° c Coefficient (Note 7) Y Suffix 50 50 (max) All Others 150 150 150 150 Long Term Stability IR = 100μA, T = 1000 Hr, 20 20 ppm TA = 25°C ± 0.1°C 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 150°C LM285 125°C LM385 100°C Thermal Resistance TO-92 TO-46 SO-8 θJA (Junction to Ambient) 180°C/W (0.4″ leads) 440°C/W 165°C/W 170°C/W (0.125″ leads) θJC (Junction to Case) N/A 80°C/W N/A 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 525016 Feedback Current 525017 Minimum Operating Current 525018 Reverse Characteristics 525019 Reverse Characteristics 525020 Forward Characteristics 525021 5 www.national.com LM185/LM285/LM385
Temperature Coefficient Typical LM185 LM285 LM385 525004 www.national.com 6 LM185/LM285/LM385
25V Low Current Shunt Regulator 525027 200 mA Shunt Regulator 525028 7 www.national.com LM185/LM285/LM385
Series-Shunt 20 mA Regulator 525029 High Efficiency Low Power Regulator 525030 Voltage Level Detector 525031 Voltage Level Detector 525032 Fast Positive Clamp 2.4V + ΔVD1 525033 Bidirectional Clamp ±2.4V 525034 www.national.com 8 LM185/LM285/LM385
Bidirectional Adjustable Clamp ±1.8V to ±2.4V 525035 Bidirectional Adjustable Clamp ±2.4V to ±6V 525036 Simple Floating Current Detector 525037 Current Source 525038 Precision Floating Current Detector 525039 9 www.national.com LM185/LM285/LM385
Centigrade Thermometer, 10mV/°C 525011 Freezer Alarm 525012 Schematic Diagram 525008 www.national.com 10 LM185/LM285/LM385
Physical Dimensions inches (millimeters) unless otherwise noted 20-Leadless Chip Carrier (E) TO-46 Metal Can Package (H) 11 www.national.com LM185/LM285/LM385
TO-92 Plastic Package (Z) www.national.com 12 LM185/LM285/LM385
13 www.national.com LM185/LM285/LM385
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