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National Semiconductor
National Semiconductor

LM20BIM7 Datasheet

LM20 2.4V/ 10A/ SC70/ micro SMD Temperature Sensor


LM20BIM7 Datasheet Preview


October 1999
LM20
2.4V, 10µA, SC70, micro SMD Temperature Sensor
General Description
The LM20 is a precision analog output CMOS
integrated-circuit temperature sensor that operates over a
−55˚C to +130˚C temperature range. The power supply op-
erating 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 speci-
fied to a parabolic transfer function is ±1.5˚C at an ambient
temperature of +30˚C. The temperature error increases lin-
early 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 capabil-
ity 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
n Cellular Phones
n Computers
n Power Supply Modules
n Battery Management
n FAX Machines
n Printers
n HVAC
n Disk Drives
n Appliances
Features
n Rated for full −55˚C to +130˚C range
n Available in an SC70 and a micro SMD package
n Predictable curvature error
n Suitable for remote applications
Key Specifications
n Accuracy at +30˚C
n Accuracy at +130˚C & −55˚C
n Power Supply Voltage Range
n Current Drain
n Nonlinearity
n Output Impedance
n Load Regulation
0 µA < IL< +16 µA
±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)
Typical Application
Output Voltage vs Temperature
DS100908-2
VO = (−3.88x10−6xT2) + (−1.15x10−2xT) + 1.8639
or
where:
T is temperature, and VO is the measured output voltage of the LM20.
Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)
Operating from a Single Li-Ion Battery Cell
DS100908-24
© 1999 National Semiconductor Corporation DS100908
www.national.com
Page 1

Typical Application (Continued)
Temperature (T)
+130˚C
+100˚C
+80˚C
+30˚C
Typical VO
+303 mV
+675 mV
+919 mV
+1515 mV
Connection Diagrams
SC70-5
Temperature (T)
+25˚C
0˚C
−30˚C
−40˚C
−55˚C
Typical VO
+1574 mV
+1863.9 mV
+2205 mV
+2318 mV
+2485 mV
micro SMD
DS100908-1
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.
Top View
See NS Package Number MAA05A
DS100908-32
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 BPA04DDC
Ordering Information
Order
Number
LM20BIM7
LM20BIM7X
LM20CIM7
LM20CIM7X
LM20SIBP
Temperature
Accuracy
±2.5˚C
±2.5˚C
±5˚C
±5˚C
±3.5˚C
LM20SIBPX
±3.5˚C
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
www.national.com
2
Page 2

Absolute Maximum Ratings (Note 1)
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
+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
Lead Temperature
SC-70 Package (Note 4) :
Vapor Phase (60 seconds)
Infrared (15 seconds)
+215˚C
+220˚C
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, θJA(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
TBD˚C/W
Electrical Characteristics
Unless otherwise noted, these specifications apply for
other limits TA = TJ = 25˚C; Unless otherwise noted.
V+
=
+2.7
VDC.
Boldface
limits
apply
for
TA
=
TJ
=
TMIN
to
TMAX
;
all
Parameter
Conditions
Typical
(Note 6)
LM20B
Limits
LM20C
Limits
LM20S
Limits
Units
(Limit)
(Note 7) (Note 7) (Note 7)
Temperature to Voltage Error
VO = (−3.88x10−6xT2)
+ (−1.15x10−2xT) + 1.8639V
(Note 8)
Output Voltage at 0˚C
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
+1.8639
±1.5
±2.5
±2.5
±2.2
±2.1
±2.0
±1.9
±2.2
±2.3
±2.5
±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
˚C (max)
˚C (max)
˚C (max)
˚C (max)
˚C (max)
˚C (max)
˚C (max)
˚C (min)
˚C (max)
˚C (max)
V
Variance from Curve
±1.0
˚C
Non-Linearity (Note 9)
Sensor Gain (Temperature
Sensitivity or Average Slope)
to equation:
VO=−11.77 mV/˚CxT+1.860V
Output Impedance
−20˚C TA +80˚C
−30˚C TA +100˚C
0 µA IL +16 µA(Notes
11, 12)
±0.4
−11.77
−11.4
−12.2
160
−11.0
−12.6
160
−11.0
−12.6
%
mV/˚C (min)
mV/˚C (max)
160 (max)
Load Regulation(Note 10)
0 µA IL +16 µA(Notes
11, 12)
−2.5
−2.5
−2.5
mV (max)
Line Regulation
+2. 4 V V+ +5.0V
+3.3
+3.7
+3.7
mV/V (max)
+5.0 V V+ +5.5 V
+8.8
+8.9
+8.9
mV (max)
Quiescent Current
+2. 4 V V+ +5.5V
4.5 7 7 7 µA (max)
+2. 4 V V+ +5.0V
4.5 10 10 10 µA (max)
Change of Quiescent Current +2. 4 V V+ +5.5V
+0.7
µA
Temperature Coefficient of
−11
nA/˚C
Quiescent Current
Shutdown Current
V+ +0.8 V
0.02
µA
3 www.national.com
Page 3
Part Number LM20BIM7
Manufactur National Semiconductor
Description LM20 2.4V/ 10A/ SC70/ micro SMD Temperature Sensor
Total Page 9 Pages
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