LM185-2.5QML LM185-2.5QML Micropower Voltage Reference Diode Literature Number: SNVS385 LM185-2.5QML Micropower Voltage Reference Diode General Description The LM185-2.5 are micropower 2-terminal band-gap voltage regulator diodes. Operating over a 20 µA 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 LM185-2.5 bandgap reference uses only transistors and resistors, low noise and good long term stability result. Careful design of the LM185-2.5 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 LM185-2.5 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. For applications requiring 1.2V see LM185-1.2. Features n n n n Operating current of 20 µA to 20 mA 0.6Ω dynamic impedance (A grade) Low temperature coefficient Low voltage reference — 2.5V Ordering Information NS Part Number JAN Part Number NS Package Number Package Description LM185H-2.5-SMD 5962–8759402XA H02A 2LD, T0–46 Metal Can LM185H-2.5/883 H02A 2LD, T0–46 Metal Can LM185WG-2.5-QV 5962–8759402VYA WG10A 10LD Ceramic SOIC LM185WG-2.5/883 5962–8759402YA WG10A 10LD Ceramic SOIC LM185BYH2.5/883 LM185BYH2.5-SMD LM185BYH2.5-QV H02A 2LD, T0–46 Metal Can 5962–8759406XA H02A 2LD, T0–46 Metal Can 5962–8759406VXA H02A 2LD, T0–46 Metal Can Connection Diagrams Ceramic SOIC (WG) TO-46 Metal Can Package (H) 20156203 See NS Package Number WG10A © 2005 National Semiconductor Corporation DS201562 20156213 Bottom View See NS Package Number H02A www.national.com LM185-2.5QML Micropower Voltage Reference Diode November 2005 LM185-2.5QML Schematic Diagram 20156201 www.national.com 2 LM185-2.5QML Absolute Maximum Ratings (Note 1) Reverse Current 30 mA Forward Current 10 mA Operating Temperature Range −55˚C ≤ TA ≤ + 125˚C Storage Temperature −55˚C ≤ TA ≤ + 150˚C Maximum Junction Temperature (TJmax) (Note 2) 150˚C Lead Temperature (Soldering, 10 sec) TO-46 Metal Can 300˚C Ceramic SOIC 260˚C Thermal Resistance θJA T0–46 Metal Can (Still Air) 300˚C/W T0–46 Metal Can (500LF / Min Air Flow) 139˚C/W Ceramic SOIC (Still Air) 194˚C/W Ceramic SOIC (500LF / Min Air Flow) 128˚C/W θJC T0–46 Metal Can 57˚C/W Ceramic SOIC 23˚C/W Package Weight (Typical) T0–46 Metal Can TBD Ceramic SOIC 210 mg ESD Tolerance (Note 3) 4000V 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 LM185-2.5QML LM185–2.5 Electrical Characteristics DC Parameters Symbol VRef Parameter Reverse Breakdown Voltage Conditions Notes VF Forward Bias Voltage Max Units Subgroups IR = 20µA 2.462 2.538 V 1 IR = 30µA 2.425 2.575 V 2, 3 IR = 1mA 2.462 2.538 V 1 2.425 2.575 V 2, 3 IR = 20mA ∆VRef / ∆IR Reverse Breakdown Voltage Change with Current Min 20µA ≤ IR ≤ 1mA 2.462 2.538 V 1 2.425 2.575 V 2, 3 mV 1 2, 3 -1.0 1.0 30µA ≤ 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 IPI. Symbol VRef Min Max Units Subgroups IR = 20µA -10 10 mV 1 IR = 20mA -10 10 mV 1 Min Max Units Subgroups V 1 2, 3 Parameter Reverse Breakdown Voltage Conditions Notes LM185BY–2.5 Electrical Characteristics DC Parameters Symbol VRef Parameter Reverse Breakdown Voltage Conditions Notes IR = 20µA 2.462 2.538 IR = 30µA 2.425 2.575 V IR = 1mA 2.462 2.538 V 1 2.425 2.575 V 2, 3 2.462 2.538 V 1 V 2, 3 IR = 20mA 2.425 2.575 ∆VRef / ∆IR Reverse Breakdown Voltage Change with Current 20µA ≤ IR ≤ 1mA -1.0 1.0 mV 1 30µA ≤ IR ≤ 1mA -1.5 1.5 mV 2, 3 1mA ≤ IR ≤ 20mA VF Forward Bias Voltage TC Temperature Coefficient IF = 2mA -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 4) DC Drift Parameters Delta calculations performed on QMLV devices at group B , subgroup 5, unless otherwise specified on IPI. Symbol Parameter Conditions Notes Min Max Units Subgroups VRef 1 Reverse Breakdown Voltage IR = 20µA -10 10 mV 1 VRef 2 Reverse Breakdown Voltage IR = 20mA -10 10 mV 1 www.national.com 4 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, 1.5 kΩ in series with 100 pF 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) Typical Performance Characteristics Reverse Characteristics Reverse Characteristics 20156216 20156215 Forward Characteristics Temperature Drift 20156217 20156218 5 www.national.com LM185-2.5QML 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. LM185-2.5QML Typical Performance Characteristics (Continued) Reverse Dynamic Impedance Reverse Dynamic Impedance 20156219 20156220 Noise Voltage Filtered Output Noise 20156222 20156221 Response Time 20156223 www.national.com 6 LM185-2.5QML Applications Wide Input Range Reference 20156212 Micropower Reference from 9V Battery 20156202 Micropower 10V Reference (Note 6) Micropower 5V Reference (Note 5) 20156210 Note 6: IQ . 30 µA standby current 20156209 Note 5: IQ . 40 µA 7 www.national.com LM185-2.5QML Applications (Continued) Precision 1 µA to 1 mA Current Sources 20156225 20156224 METER THERMOMETERS 0˚F–50˚F Thermometer 0˚C–100˚C Thermometer 20156227 20156226 Calibration 1. Short LM385-2.5, adjust R3 for IOUT=temp at 1.8 µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Calibration 1. Short LM385-2.5, adjust R3 for IOUT=temp at 1µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade www.national.com 8 LM185-2.5QML Applications (Continued) Improving Regulation of Adjustable Regulators 20156207 Micropower Thermocouple Cold Junction Compensator 20156206 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. Voltage Voltage Thermocouple Seebeck Co- R1 R2 Across R1 Across R2 Type efficient (Ω) (Ω) @ 25˚C (mV) (µV/˚C) (mV) J 52.3 523 1.24k 15.60 14.32 T 42.8 432 12.77 11.78 K 40.8 412 953Ω 12.17 11.17 S 6.4 63.4 150Ω 1.908 1.766 1k Typical supply current 50 µA 9 www.national.com LM185-2.5QML Revision History Section Released 11/08/05 www.national.com Revision A Section Originator New Release, Corporate format L. Lytle 10 Changes 2 MDS data sheets converted into one Corp. data sheet format. MNLM185-2.5-X Rev 2A2 and MNLM185-2.5BY-X Rev 1B1 will be archived. LM185-2.5QML Physical Dimensions inches (millimeters) unless otherwise noted Ceramic SOIC Package (WG) NS Package Number WG10A TO-46 Metal Can Package (H) NS Package Number H02A 11 www.national.com LM185-2.5QML Micropower Voltage Reference Diode Notes 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. 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. 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