LM50

LM50 NSC | Alldatasheet

Document overview

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Technical content

Features

n Calibrated directly in degree Celsius (Centigrade) n Linear + 10.0 mV/˚C scale factor n ±2˚C accuracy guaranteed at +25˚C n Specified for full −40˚ to +125˚C range n Suitable for remote applications n Low cost due to wafer-level trimming n Operates from 4.5V to 10V n Less than 130 µA current drain n Low self-heating, less than 0.2˚C in still air n Nonlinearity less than 0.8˚C over temp Connection Diagram Order SOT-23 Supplied As Number Device Marking LM50BIM3 T5B 1000 Units on Tape and Reel LM50CIM3 T5C 1000 Units on Tape and Reel LM50BIM3X T5B 3000 Units on Tape and Reel LM50CIM3X T5C 3000 Units on Tape and Reel Typical Application SOT-23 DS012030-1 Top View See NS Package Number MA03B DS012030-3 FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C)

Absolute Maximum Ratings(Note 1) Supply Voltage +12V to −0.2V Output Voltage (+V S + 0.6V) to −1.0V Output Current 10 mA Storage Temperature −65˚C to +150˚C Lead Temperature: Vapor Phase (60 seconds) 215˚C Infrared (15 seconds) 220˚C T JMAX , Maximum Junction Temperature 150˚C ESD Susceptibility (Note 3): Human Body Model Machine Model 2000V 250V Operating Ratings(Note 1) Specified Temperature Range: T MIN to TMAX LM50C −40˚C to +125˚C LM50B −25˚C to +100˚C Operating Temperature Range −40˚C to +150˚C θ JA (Note 4) 450˚C/W Supply Voltage Range (+VS) +4.5V to +10V

Electrical Characteristics

Unless otherwise noted, these specifications apply for VS = +5 VDC and ILOAD = +0.5 µA, in the circuit ofFigure 1.Boldface limits apply for the specified TA = TJ = TMIN to TMAX ; all other limits TA = TJ = +25˚C, unless otherwise noted. Parameter Conditions LM50B LM50C Units (Limit)Typical Limit Typical Limit (Note 5) (Note 5) Accuracy T A = +25˚C ±2.0 ±3.0 ˚C (max) (Note 6) T A = TMAX ±3.0 ±4.0 ˚C (max) TA = TMIN +3.0, −3.5 ±4.0 ˚C (max) Nonlinearity (Note 7) ±0.8 ±0.8 ˚C (max) Sensor Gain +9.7 +9.7 mV/˚C (min) (Average Slope) +10.3 +10.3 mV/˚C (max) Output Resistance 2000 4000 2000 4000 Ω (max) Line Regulation +4.5V ≤ VS ≤ +10V ±0.8 ±0.8 mV/V (max) (Note 8) ±1.2 ±1.2 mV/V (max) Quiescent Current +4.5V ≤ VS ≤ +10V 130 130 µA (max) (Note 9) 180 180 µA (max) Change of Quiescent +4.5V ≤ VS ≤ +10V 2.0 2.0 µA (max) Current (Note 9) Temperature Coefficient of +1.0 +2.0 µA/˚C Quiescent Current Long Term Stability (Note 10) T 1000 hours Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2:See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon- ductor Linear Data Book for other methods of soldering surface mount devices. Note 3:Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin. Note 4:Thermal resistance of the SOT-23 package is specified without a heat sink, junction to ambient. Note 5:Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 6:Accuracy is defined as the error between the output voltage and 10mv/˚C times the device’s case temperature plus 500 mV, at specified conditions of volt- age, current, and temperature (expressed in ˚C). Note 7:Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device’s rated temperature range. Note 8:Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be com- puted by multiplying the internal dissipation by the thermal resistance. Note 9:Quiescent current is defined in the circuit ofFigure 1. Note 10:For best long-term stability, any precision circuit will give best results if the unit is aged at a warm temperature, and/or temperature cycled for at least 46 hours before long-term life test begins. This is especially true when a small (Surface-Mount) part is wave-soldered; allow time for stress relaxation to occur. The ma- jority of the drift will occur in the first 1000 hours at elevated temperatures. The drift after 1000 hours will not continue at the first 1000 hour rate. www.national.com 2

1.0 Mounting

0.2˚C of the surface temperature.

• Part soldered to 30 gauge wire.

2.0 Capacitive Loads

special precautions, the LM50 can drive any capacitive load. FIGURE 2. Printed Circuit Board Used for Heat Sink to Generate All Curves. FIGURE 3. LM50 No Decoupling Required FIGURE 4. LM50C with Filter for Noisy Environment

2.0 Capacitive Loads(Continued)

the overall response time of the LM50.

3.0 Typical Applications

*R2 ≈ 2k with a typical 1300 ppm/˚C drift. FIGURE 5. Block Diagram FIGURE 6. Centigrade Thermostat/Fan Controller FIGURE 7. Temperature To Digital Converter (Serial Output) (+125˚C Full Scale)

3.0 Typical Applications(Continued)

FIGURE 8. Temperature To Digital Converter (Parallel TRI-STATE® Outputs for FIGURE 9. LM50 With Voltage-To-Frequency Converter And Isolated Output

Physical Dimensionsinches (millimeters) unless otherwise noted 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. 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 Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.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 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 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 www.national.com SOT-23 Molded Small Outline Transistor Package (M3) Order Number LM50BIM3, or LM50CIM3 LM50 SOT-23 Single-Supply Centigrade Temperature Sensor 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.