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Details, datasheet, quote on part number:LM20
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| Part: | LM20 |
| Category: | Sensors => Temperature Sensors |
| Description: | 2.4v, 10ua, Sc70, Micro SMD Temperature Sensor |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM20 datasheet File size : 218 kB |
| Request For quote: | Find where to buy LM20
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Datasheet text preview:
LM20 2.4V, 10µA, SC70, micro SMD Temperature Sensor
January 2003
LM20 2.4V, 10µA, SC70, micro SMD Temperature Sensor
General Description
The LM20 is a precision analog output CMOS integratedcircuit temperature sensor that operates over a -55°C 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 ± 1.5°C at an ambient temperature of +30°C. The temperature error increases linearly and reaches a maximum of ± 2.5°C 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 +130°C and -55°C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to -30°C, while the positive remains at +130°C. The LM20's quiescent current is less than 10 µA. Therefore, self-heating is less than 0.02°C 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. n n n n n n Battery Management FAX Machines Printers HVAC Disk Drives Appliances
Features
n n n n Rated for full -55°C to +130°C range Available in an SC70 and a micro SMD package Predictable curvature error Suitable for remote applications
Key Specifications
j Accuracy at +30°C j Accuracy at +130°C & -55°C j Power Supply Voltage Range j Current Drain j Nonlinearity j Output Impedance j Load Regulation
± 1.5 to ± 4 °C (max) ± 2.5 to ± 5 °C (max)
+2.4V to +5.5V 10 µA (max)
± 0.4 % (typ)
160 (max) -2.5 mV (max)
Applications
n Cellular Phones n Computers n Power Supply Modules
0 µA < IL < +16 µA
Typical Application
Full-Range Celsius (Centigrade) Temperature Sensor (-55°C to +130°C) Operating from a Single Li-Ion Battery Cell Output Voltage vs Temperature
10090802
VO = (-3.88x10-6xT2) + (-1.15x10-2xT) + 1.8639
10090824
where: T is temperature, and VO is the measured output voltage of the LM20.
© 2003 National Semiconductor Corporation
DS100908
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LM20
Typical Application
(Continued) Temperature (T) +130°C +100°C +80°C +30°C +25°C 0°C -30°C -40°C -55°C Typical VO +303 mV +675 mV +919 mV +1515 mV +1574 mV +1863.9 mV +2205 mV +2318 mV +2485 mV
Connection Diagrams
SC70-5 micro SMD
10090801
Note: - GND (pin 2) may be grounded or left floating. For optimum thermal conductivity to the pc board ground plane pin 2 should be grounded. - NC (pin 1) should be left floating or grounded. Other signal traces should not be connected to this pin.
10090832
Note: - Pin numbers are referenced to the package marking text orientation. - Reference JEDEC Registration MO-211, variation BA - The actual physical placement of package marking will vary slightly from part to part. The package marking will designate the date code and will vary considerably. Package marking does not correlate to device type in any way.
Top View See NS Package Number MAA05A
Top View See NS Package Number BPA04DDC
Ordering Information
Order Number LM20BIM7 LM20BIM7X LM20CIM7 LM20CIM7X LM20SIBP LM20SIBPX Temperature Accuracy Temperature Range -55°C to +130°C -55°C to +130°C -55°C to +130°C -55°C to +130°C -40°C to +125°C -40°C to +125°C NS Package Number MAA05A MAA05A MAA05A MAA05A BPA04DDC BPA04DDC Device Marking T2B T2B T2C T2C Date Code Date Code Transport Media 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel
± 2.5°C ± 2.5°C ± 5°C ± 5°C ± 3.5°C ± 3.5°C
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LM20
Absolute Maximum Ratings
Supply Voltage Output Voltage Output Current Input Current at any pin (Note 2) Storage Temperature Maximum Junction Temperature (TJMAX) ESD Susceptibility (Note 3) : Human Body Model Machine Model Lead Temperature SC-70 Package (Note 4) : Vapor Phase (60 seconds)
(Note 1)
Infrared (15 seconds)
+220°C
+6.5V to -0.2V (V+ + 0.6 V) to -0.6 V 10 mA 5 mA -65°C to +150°C +150°C 2500 V 250 V
Operating Ratings(Note 1)
Specified Temperature Range: 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+) Thermal Resistance, JA(Note 5) SC-70 micro SMD TMIN TA TMAX -30°C TA +130°C -55°C TA +130°C -30°C TA +125°C -40°C TA +125°C +2.4 V to +5.5 V 415°C/W 340°C/W
+215°C
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 = 25°C; Unless otherwise noted. Parameter Conditions Typical (Note 6) LM20B Limits (Note 7) Temperature to Voltage Error VO = (-3.88x10-6xT2) + (-1.15x10-2xT) + 1.8639V (Note 8) TA = +25°C to +30°C TA = +130°C TA = +125°C TA = +100°C TA = +85°C TA = +80°C TA = 0°C TA = -30°C TA = -40°C TA = -55°C Output Voltage at 0°C Variance from Curve Non-Linearity (Note 9) Sensor Gain (Temperature Sensitivity or Average Slope) to equation: VO = -11.77 mV/°CxT+1.860V Output Impedance Load Regulation(Note 10) Line Regulation Quiescent Current -20°C TA +80°C -30°C TA +100°C +1.8639 LM20C Limits (Note 7) LM20S Limits (Note 7) Units (Limit) °C (max) °C (max) °C (max) °C (max) °C (max) °C (max) °C (max) °C (min) °C (max) °C (max) V °C % -11.4 -12.2 -11.0 -12.6 -11.0 -12.6 mV/°C (min) mV/°C (max)
± 1.5 ± 2.5 ± 2.5 ± 2.2 ± 2.1 ± 2.0 ± 1.9 ± 2.2 ± 2.3 ± 2.5 ± 1.0 ± 0.4
-11.77
± 4.0 ± 5.0 ± 5.0 ± 4.7 ± 4.6 ± 4.5 ± 4.4 ± 4.7 ± 4.8 ± 5.0
± 2.5 ± 3.5 ± 3.2 ± 3.1 ± 3.0 ± 2.9 ± 3.3 ± 3.5
0 µA IL +16 µA (Notes 11, 12) 0 µA IL +16 µA (Notes 11, 12) +2. 4 V V+ +5.0V +5.0 V V +5.5 V
+
160 -2.5 +3.3 +11 4.5 4.5 4.5 +0.7 -11 7 9 10
160 -2.5 +3.7 +11 7 9 10
160 -2.5 +3.7 +11 7 9 10
(max) mV (max) mV/V (max) mV (max) µA (max) µA (max) µA (max) µA nA/°C
+2. 4V V+ +5.0V +5.0V V+ +5.5V +2. 4V V+ +5.0V
Change of Quiescent Current Temperature Coefficient of Quiescent Current
+2. 4 V V+ +5.5V
3
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