LM20 LM20 2.4V, 10?A, SC70, micro SMD Temperature Sensor Literature Number: SNIS106O LM20 2.4V, 10A, SC70, micro SMD Temperature Sensor General Description The LM20 is a precision analog output CMOS integrated-circuit temperature sensor that operates over a -55C to +130 C temperature range. The power supply operating range is +2.4 V to +5.5 V. The transfer function of LM20 is predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM20 when specified to a parabolic transfer function is 1.5C at an ambient temperature of +30 C. The temperature error increases linearly and reaches a maximum of 2.5C at the temperature range extremes. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V the temperature range extremes are +130C and -55C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to -30C, while the positive remains at +130C. The LM20's quiescent current is less than 10 A. Therefore, self-heating is less than 0.02C in still air. Shutdown capability for the LM20 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates or does not necessitate shutdown at all. Applications Cellular Phones Computers Power Supply Modules Battery Management FAX Machines Printers HVAC Disk Drives Appliances Features Rated for full -55C to +130C range Available in an SC70 and micro SMD package Predictable curvature error Suitable for remote applications Key Specifications Accuracy at +30C 1.5 to 4 C (max) Accuracy at +130C & -55C 2.5 to 5 C (max) Power Supply Voltage Range +2.4V to +5.5V 10 A (max) Current Drain Nonlinearity 0.4 % (typ) Output Impedance 160 (max) Load Regulation 0 A < IL< +16 A -2.5 mV (max) Typical Application Full-Range Celsius (Centigrade) Temperature Sensor (-55C to +130C) Operating from a Single Li-Ion Battery Cell Output Voltage vs Temperature 10090802 VO = (-3.88x10-6xT2) + (-1.15x10-2xT) + 1.8639 where: T is temperature, and VO is the measured output voltage of the LM20. (c) 2011 National Semiconductor Corporation 100908 10090824 www.national.com LM20 2.4V, 10A, SC70, micro SMD Temperature Sensor September 21, 2010 LM20 Temperature (T) Typical VO +130C +303 mV +100C +675 mV +80C +919 mV +30C +1515 mV +25C +1574 mV 0C +1863.9 mV -30C +2205 mV -40C +2318 mV -55C +2485 mV Connection Diagrams SC70-5 micro SMD 10090801 Note: 10090832 - GND (pin 2) may be grounded or left floating. For optimum thermal conNote: ductivity to the pc board ground plane pin 2 should be grounded. - NC (pin 1) should be left floating or grounded. Other signal traces should - Pin numbers are referenced to the package marking text orientation. - Reference JEDEC Registration MO-211, variation BA not be connected to this pin. - The actual physical placement of package marking will vary slightly from Top View part to part. The package marking will designate the date code and will vary conSee NS Package Number MAA05A siderably. Package marking does not correlate to device type in any way. Top View See NS Package Number TLA04ZZA Ordering Information Order Number Temperature Accuracy Temperature Range NS Package Number Device Marking LM20BIM7 2.5C -55C to +130C MAA05A T2B 1000 Units on Tape and Reel LM20BIM7X 2.5C -55C to +130C MAA05A T2B 3000 Units on Tape and Reel LM20CIM7 5C -55C to +130C MAA05A T2C 1000 Units on Tape and Reel LM20CIM7X 5C -55C to +130C MAA05A T2C 3000 Units on Tape and Reel LM20SITL 3.5C -40C to +125C TLA04ZZA Date Code 250 Units on Tape and Reel LM20SITLX 3.5C -40C to +125C TLA04ZZA Date Code 3000 Units on Tape and Reel www.national.com 2 Transport Media Supply Voltage Output Voltage Output Current Input Current at any pin (Note 2) Storage Temperature (Note 1) TMIN TA TMAX Specified Temperature Range: +6.5V to -0.2V (V+ + 0.6 V) to -0.6 V 10 mA 5 mA -65C to +150C +150C LM20B, LM20C with 2.4 V V+ 2.7 V LM20B, LM20C with 2.7 V V+ 5.5 V LM20S with 2.4 V V+ 5.5 V LM20S with 2.7 V V+ 5.5 V Supply Voltage Range (V+) Maximum Junction Temperature (TJMAX) ESD Susceptibility (Note 3) Human Body Model 2500 V Machine Model 250 V Soldering process must comply with National's Reflow Temperature Profile specifications. Refer to www.national.com/packaging. (Note 4) LM20 Operating Ratings Absolute Maximum Ratings (Note 1) -30C TA +130C -55C TA +130C -30C TA +125C -40C TA +125C +2.4 V to +5.5 V Thermal Resistance, JA (Note 5) SC-70 micro SMD 415C/W 340C/W Electrical Characteristics Unless otherwise noted, these specifications apply for V+ = +2.7 VDC. Boldface limits apply for TA = TJ = TMIN to TMAX ; all other limits TA = TJ = 25C; Unless otherwise noted. LM20B LM20C LM20S Limits (Note 7) Limits (Note 7) Limits (Note 7) TA = +25C to +30C 1.5 4.0 2.5 TA = +130C 2.5 5.0 TA = +125C 2.5 5.0 3.5 C (max) TA = +100C 2.2 4.7 3.2 C (max) TA = +85C 2.1 4.6 3.1 C (max) TA = +80C 2.0 4.5 3.0 C (max) TA = 0C 1.9 4.4 2.9 C (max) TA = -30C 2.2 4.7 3.3 C (min) TA = -40C 2.3 4.8 3.5 C (max) 2.5 5.0 Parameter Temperature to Voltage Error VO = (-3.88x10-6xT2) + (-1.15x10-2xT) + 1.8639V (Note 8) Typical (Note 6) Conditions TA = -55C Output Voltage at 0C Variance from Curve Non-Linearity (Note 9) -20C TA +80C Sensor Gain (Temperature Sensitivity or Average Slope) to -30C TA +100C equation: VO=-11.77 mV/CxT+1.860V Output Impedance 0 A IL +16 A Load Regulation(Note 10) 0 A IL +16 A Line Regulation Quiescent Current Change of Quiescent Current Units (Limit) C (max) C (max) C (max) +1.8639 V 1.0 C 0.4 % -11.77 -11.4 -12.2 -11.0 -12.6 -11.0 -12.6 mV/C (min) mV/C (max) 160 160 160 (max) -2.5 -2.5 -2.5 mV (max) +3.3 +3.7 +3.7 mV/V (max) (Note 11, Note 12) (Note 11, Note 12) +2. 4 V V+ +5.0V +5.0 V V+ +5.5 V +11 +11 +11 mV (max) +5.0V 4.5 7 7 7 A (max) +5.5V 4.5 9 9 9 A (max) +5.0V 4.5 10 10 10 A (max) +2. 4 V V+ +5.5V +0.7 +2. 4V V+ +5.0V V+ +2. 4V V+ 3 A www.national.com LM20 Parameter Typical (Note 6) Conditions Temperature Coefficient of Quiescent Current Shutdown Current V+ +0.8 V LM20B LM20C LM20S Limits (Note 7) Limits (Note 7) Limits (Note 7) Units (Limit) -11 nA/C 0.02 A 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: When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 4: Reflow temperature profiles are different for lead-free and non-lead-free packages. Note 5: The junction to ambient thermal resistance (JA) is specified without a heat sink in still air using the printed circuit board layout shown in Figure 1. Note 6: Typicals are at TJ = TA = 25C and represent most likely parametric norm. Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 8: Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed inC). Note 9: Non-Linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the temperature range specified. Note 10: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance. Note 11: Negative currents are flowing into the LM20. Positive currents are flowing out of the LM20. Using this convention the LM20 can at most sink -1 A and source +16 A. Note 12: Load regulation or output impedance specifications apply over the supply voltage range of +2.4V to +5.5V. Note 13: Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply input voltage. Typical Performance Characteristics Temperature Error vs Temperature 10090825 www.national.com 4 LM20 PCB Layouts Used for Thermal Measurements 10090830 10090829 b) Layout used for measurements with small heat hink. a) Layout used for no heat sink measurements. FIGURE 1. PCB Lyouts used for thermal measurements. m = -7.76 x 10-6x T - 0.0115, 1.0 LM20 Transfer Function where T is the middle of the temperature range of interest and m is in V/C. For example for the temperature range of TMIN = -30 to TMAX = +100C: The LM20's transfer function can be described in different ways with varying levels of precision. A simple linear transfer function, with good accuracy near 25C, is T = 35C VO = -11.69 mV/C x T + 1.8663 V and Over the full operating temperature range of -55C to +130 C, best accuracy can be obtained by using the parabolic transfer function. m = -11.77 mV/C The offset of the linear transfer function can be calculated using the following equation: VO = (-3.88x10-6xT2) + (-1.15x10-2xT) + 1.8639 b = (VOP(TMAX) + VOP(T) - m x (TMAX+T))/2 solving for T: where: * VOP(TMAX) is the calculated output voltage at TMAX using the parabolic transfer function for VO * VOP(T) is the calculated output voltage at T using the parabolic transfer function for VO. Using this procedure the best fit linear transfer function for many popular temperature ranges was calculated in Figure 2. As shown in Figure 2 the error that is introduced by the linear transfer function increases with wider temperature ranges. A linear transfer function can be used over a limited temperature range by calculating a slope and offset that give best results over that range. A linear transfer function can be calculated from the parabolic transfer function of the LM20. The slope of the linear transfer function can be calculated using the following equation: Temperature Range Linear Equation VO = Maximum Deviation of Linear Equation from Parabolic Equation (C) Tmin (C) Tmax (C) -55 +130 -11.79 mV/C x T + 1.8528 V 1.41 -40 +110 -11.77 mV/C x T + 1.8577 V 0.93 -30 +100 -11.77 mV/C x T + 1.8605 V 0.70 -40 +85 -11.67 mV/C x T + 1.8583 V 0.65 -10 +65 -11.71 mV/C x T + 1.8641 V 0.23 +35 +45 -11.81 mV/C x T + 1.8701 V 0.004 +20 +30 -11.69 mV/C x T + 1.8663 V 0.004 FIGURE 2. First order equations optimized for different temperature ranges. 5 www.national.com LM20 2.0 Mounting 3.0 Capacitive Loads The LM20 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued or cemented to a surface. The temperature that the LM20 is sensing will be within about +0.02C of the surface temperature to which the LM20's leads are attached to. This presumes that the ambient air temperature is almost the same as the surface temperature; if the air temperature were much higher or lower than the surface temperature, the actual temperature measured would be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity the backside of the LM20 die is directly attached to the pin 2 GND pin. The tempertures of the lands and traces to the other leads of the LM20 will also affect the temperature that is being sensed. Alternatively, the LM20 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the LM20 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy paints or dips are often used to ensure that moisture cannot corrode the LM20 or its connections. The thermal resistance junction to ambient (JA) is the parameter used to calculate the rise of a device junction temperature due to its power dissipation. For the LM20 the equation used to calculate the rise in the die temperature is as follows: TJ = TA + JA [(V+ IQ) + (V+ - VO) IL] where IQ is the quiescent current and ILis the load current on the output. Since the LM20's junction temperature is the actual temperature being measured care should be taken to minimize the load current that the LM20 is required to drive. The tables shown in Figure 3 summarize the rise in die temperature of the LM20 without any loading, and the thermal resistance for different conditions. The LM20 handles capacitive loading well. Without any precautions, the LM20 can drive any capacitive load less than 300 pF as shown in Figure 4. Over the specified temperature range the LM20 has a maximum output impedance of 160 . In an extremely noisy environment it may be necessary to add some filtering to minimize noise pickup. It is recommended that 0.1 F be added from V+ to GND to bypass the power supply voltage, as shown in Figure 5. In a noisy environment it may even be necessary to add a capacitor from the output to ground with a series resistor as shown in Figure 5. A 1 F output capacitor with the 160 maximum output impedance and a 200 series resistor will form a 442 Hz lowpass filter. Since the thermal time constant of the LM20 is much slower, the overall response time of the LM20 will not be significantly affected. SC70-5 no heat sink 10090815 FIGURE 4. LM20 No Decoupling Required for Capacitive Loads Less than 300 pF. R () C (F) 200 1 470 0.1 680 0.01 1k 0.001 SC70-5 small heat sink JA TJ - TA JA TJ - TA (C/W) (C) (C/W) (C) Still air 412 0.2 350 0.19 Moving air 312 0.17 266 0.15 10090816 See Figure 1 for PCB layout samples. micro SMD no heat sink JA micro SMD small heat fin TJ - TA JA TJ - TA (C/W) (C) (C/W) (C) Still air 340 0.18 TBD TBD Moving air TBD TBD TBD TBD 10090833 FIGURE 5. LM20 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF. Either placement of resistor as shown above is just as effective. FIGURE 3. Temperature Rise of LM20 Due to Self-Heating and Thermal Resistance (JA) www.national.com 6 LM20 4.0 LM20 micro SMD Light Sensitivity Exposing the LM20 micro SMD package to bright sunlight may cause the output reading of the LM20 to drop by 1.5V. In a normal office environment of fluorescent lighting the output voltage is minimally affected (less than a millivolt drop). In either case it is recommended that the LM20 micro SMD be placed inside an enclosure of some type that minimizes its light exposure. Most chassis provide more than ample protection. The LM20 does not sustain permanent damage from light exposure. Removing the light source will cause LM20's output voltage to recover to the proper value. 5.0 Applications Circuits 10090818 FIGURE 6. Centigrade Thermostat 10090819 FIGURE 7. Conserving Power Dissipation with Shutdown 10090828 Most CMOS ADCs found in ASICs have a sampled data comparator input structure that is notorious for causing grief to analog output devices such as the LM20 and many op amps. The cause of this grief is the requirement of instantaneous charge of the input sampling capacitor in the ADC. This requirement is easily accommodated by the addition of a capacitor. Since not all ADCs have identical input stages, the charge requirements will vary necessitating a different value of compensating capacitor. This ADC is shown as an example only. If a digital output temperature is required please refer to devices such as the LM74. FIGURE 8. Suggested Connection to a Sampling Analog to Digital Converter Input Stage 7 www.national.com LM20 Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead SC70 Molded Package Order Number LM20BIM7 or LM20CIM7X NS Package Number MAA05A 4-Bump micro SMD Ball Grid Array Package (Large Bump) Order Number LM20SITL or LM20SITLX NS Package Number TLA04ZZA The following dimensions apply to the TLA04ZZA package shown above: X1 = X2 = 963m 30m, X3 = 600m 75m www.national.com 8 LM20 Notes 9 www.national.com LM20 2.4V, 10A, SC70, micro SMD Temperature Sensor Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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