LM185-1.2QML LM185-1.2QML Micropower Voltage Reference Diode Literature Number: SNVS384 LM185-1.2QML Micropower Voltage Reference Diode General Description The LM185-1.2 is a micropower 2-terminal band-gap voltage regulator diodes. Operating over a 10µA to 20mA current range, it features exceptionally low dynamic impedance and good temperature stability. On-chip trimming is used to provide tight voltage tolerance. Since the LM185-1.2 band-gap reference uses only transistors and resistors, low noise and good long term stability result. Careful design of the LM185-1.2 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 LM185-1.2 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. Features n n n n Operating current of 10µA to 20mA 1Ω maximum dynamic impedance (typical) Low temperature coefficient Low voltage reference - 1.235V Ordering Information NS Part Number JAN Part Number NS Package Number LM185E-1.2/883 5962–87594012A E20A 20LD LCC LM185H-1.2-SMD 5962–8759401XA H02A 2 LD T0–46 LM185H-1.2-QV 5962–8759401VXA H02A 2 LD T0–46 LM185WG-1.2/883 5962–8759401YA WG10A LM185BYH-1.2-SMD 5962–8759405XA H02A LM185WG-1.2-QV 5962–8759401VYA WG10A Package Description 10LD Ceramic SOIC 2 LD T0–46 10LD Ceramic SOIC Connection Diagrams Hermetic Leadless Chip Carrier (E) TO-46 Metal Can Package (H) 20156106 20156135 See NS Package Number E20A © 2005 National Semiconductor Corporation DS201561 Bottom View See NS Package Number H02A www.national.com LM185-1.2QML Micropower Voltage Reference Diode October 2005 LM185-1.2QML Connection Diagrams (Continued) Ceramic SOIC (WG) 20156134 See NS Package Number WG10A Schematic Diagram 20156107 www.national.com 2 LM185-1.2QML Absolute Maximum Ratings (Note 1) Reverse Current 30mA Forward Current 10mA −55˚C ≤ TA ≤ +125˚C Operating Temperature Range Maximum Junction Temperature (TJmax) (Note 2) +150˚C −55˚C ≤ TA ≤ +150˚C Storage Temperature Lead Temperature (Soldering 10 Seconds) Ceramic SOIC 260˚C TO-46 package 300˚C 20LD LCC package 300˚C Thermal Resistance θJA Metal Can (Still Air) 300˚C/W Metal Can (500LF / Min Air Flow) 139˚C/W 20LD LCC (Still Air) 100˚C/W 20LD LCC (500LF / Min Air Flow) 73˚C/W Ceramic SOIC (Still Air) 194˚C/W Ceramic SOIC (500LF / Min Air Flow) 128˚C/W θJC Metal Can 57˚C/W 20LD LCC 25˚C/W Ceramic SOIC 23˚C/W Package Weight (Typical) Metal Can TBD 20LD LCC TBD Ceramic SOIC 210mg ESD Tolerance (Note 3) 4KV Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup Description 1 Static tests at Temp ˚C 25 2 Static tests at 125 3 Static tests at -55 4 Dynamic tests at 25 5 Dynamic tests at 125 6 Dynamic tests at -55 7 Functional tests at 25 8A Functional tests at 125 8B Functional tests at -55 9 Switching tests at 25 10 Switching tests at 125 11 Switching tests at -55 12 Settling time at 25 13 Settling time at 125 14 Settling time at -55 3 www.national.com LM185-1.2QML LM185–1.2 Electrical Characteristics DC Parameters Symbol VRef Parameter Reverse Breakdown Voltage Conditions Notes VF Forward Bias Voltage Max Units Subgroups IR = 10µA 1.223 1.247 V 1 IR = 20µA 1.205 1.26 V 2, 3 IR = 1mA 1.223 1.247 V 1 1.205 V 2, 3 IR = 20mA ∆VRef / ∆IR Reverse Breakdown Voltage Change with Current Min 10µA ≤ IR ≤ 1mA 1.26 1.223 1.247 V 1 1.205 1.26 V 2, 3 -1.0 1.0 mV 1 2, 3 20µA ≤ IR ≤ 1mA -1.5 1.5 mV 1mA ≤ IR ≤ 20mA -10.0 10.0 mV 1 -20.0 20.0 mV 2, 3 -1.0 -0.4 V 1 IF = 2mA DC Drift Parameters Delta calculations performed on QMLV devices at group B , subgroup 5, unless otherwise specified on the IPI. Symbol VR Parameter Reverse Breakdown Voltage Conditions Notes Min Max Units Subgroups IR = 10µA -0.01 0.01 V 1 IR = 20mA -0.01 0.01 V 1 Min Max Units Subgroups V 1 2, 3 LM185BY–1.2 Electrical Characteristics DC Parameters Symbol VRef Parameter Reverse Breakdown Voltage Conditions Notes IR = 10µA 1.223 1.247 IR = 20µA 1.205 1.26 V IR = 1mA 1.223 1.247 V 1 1.205 1.26 V 2, 3 1.223 1.247 V 1 2, 3 IR = 20mA ∆VRef / ∆IR Reverse Breakdown Voltage Change with Current 1.205 1.26 V 10µA ≤ IR ≤ 1mA -1.0 1.0 mV 1 20µA ≤ IR ≤ 1mA -1.5 1.5 mV 2, 3 1mA ≤ IR ≤ 20mA VF Forward Bias Voltage TC Temperature Coefficient IF = 2mA (Note 4) -10.0 10.0 mV 1 -20.0 20.0 mV 2, 3 -1.0 -0.4 V 1 50 PPM/˚C 2, 3 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is 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. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. Note 3: Human body model, 1.5KΩ in series with 100pF. Note 4: The average temperature coefficient is defined as the maximum deviation of reference voltage, at all measured temperatures between the operating TMin & TMax, divided by (TMax − TMin). The measured temperatures (TMeasured) are −55˚C, 25˚C, & 125˚C or ∆VRef / (TMax − TMin) www.national.com 4 LM185-1.2QML Typical Performance Characteristics Reverse Characteristics Reverse Characteristics 20156113 20156114 Temperature Drift of 3 Representative Units Forward Characteristics 20156116 20156115 Reverse Dynamic Impedance Reverse Dynamic Impedance 20156118 20156117 5 www.national.com LM185-1.2QML Typical Performance Characteristics (Continued) Noise Voltage Filtered Output Noise 20156120 20156119 Response Time 20156121 Typical Applications Reference from 1.5V Battery Wide Input Range Reference 20156123 20156108 Micropower Reference from 9V Battery 20156122 www.national.com 6 (Continued) Precision 1µA to 1mA Current Sources Micropower* 5V Regulator 20156126 20156124 *IQ . 30µA Micropower* 10V Reference 20156127 20156125 *IQ .20µA standby current 7 www.national.com LM185-1.2QML Typical Applications LM185-1.2QML Typical Applications (Continued) METER THERMOMETERS Centigrade Thermometer 0˚C−100˚C Thermometer 20156101 20156128 Calibration Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1µA/˚K 1. Adjust R1 so that V1 = temp at 1mV/˚K 2. Remove short, adjust R2 for correct reading in centigrade 2. Adjust V2 to 273.2mV †IQ at 1.3V.500µA †IQ for 1.3V to 1.6V battery volt- IQ at 1.6V.2.4mA age = 50µA to 150µA Micropower Thermocouple Cold Junction Compensator Lower Power Thermometer 20156129 *2N3638 or 2N2907 select for inverse HFE . 5 †Select for operation at 1.3V ‡ IQ . 600µA to 900µA 0˚F−50˚F Thermometer 20156131 Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. Thermocouple Type R1 R2 Voltage Voltage Coefficient (Ω) (Ω) Seebeck Across R1 Across R2 @ 25˚C (mV) (µV/˚C) (mV) 20156130 Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Typical supply current 50µA www.national.com 8 J 52.3 5231.24k 15.60 T 42.8 432 1k 12.77 14.32 11.78 K 40.8 412953Ω 12.17 11.17 S 6.4 63.4150Ω 1.908 1.766 Released 10/07/05 Revision A Section Originator New Release, Corporate format L. Lytle 9 Changes 2 MDS data sheets converted into one Corp. data sheet format. MNLM185-1.2-X Rev 2A3 and MNLM185BY-1.2-X Rev 0B0 data sheets will be archived. www.national.com LM185-1.2QML Revision History Section LM185-1.2QML Physical Dimensions inches (millimeters) unless otherwise noted TO-46 Metal Can Package (H) NS Package Number H02A Leadless Chip Carrier Package (E) NS Package Number E20A www.national.com 10 LM185-1.2QML Micropower Voltage Reference Diode Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic SOIC Package (WG) NS Package Number WG10A 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. For the most current product information visit us at www.national.com. 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