NSC LM20SIBP, LM20CIM7, LM20BIM7 Datasheet

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 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
temperature of +30˚C. The temperature error increases lin­early and reaches a maximum of
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 stillair. 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.

±

1.5˚C at an ambient

±

2.5˚C at the temperature

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 +2.4V to +5.5V
n Current Drain 10 µA (max)
n Nonlinearity
n Output Impedance 160 Ω (max)
n Load Regulation

0µA

<

<

I

+16 µA −2.5 mV (max)

L

±

1.5 to±4 ˚C (max)

±

2.5 to±5 ˚C (max)

October 1999

±

0.4%(typ)

LM20 2.4V, 10µA, SC70, micro SMD Temperature Sensor

Typical Application

Output Voltage vs Temperature

DS100908-2

=

V

(−3.88x10

O

or

where:

T is temperature, and V

© 1999 National Semiconductor Corporation DS100908 www.national.com

−6xT2

) + (−1.15x10−2xT) + 1.8639

is the measured output voltage of the LM20.

O

Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)

Operating from a Single Li-Ion Battery Cell

DS100908-24

Typical Application (Continued)

LM20

Temperature (T) Typical V

+130˚C +303 mV
+100˚C +675 mV

+80˚C +919 mV
+30˚C +1515 mV

Connection Diagrams

Temperature (T) Typical V

O

+25˚C +1574 mV

O

0˚C +1863.9 mV

−30˚C +2205 mV

−40˚C +2318 mV

−55˚C +2485 mV

SC70-5

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.

DS100908-1

Top View

See NS Package Number MAA05A

micro SMD

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.

DS100908-32

Top View

See NS Package Number BPA04DDC

Ordering Information

Order Temperature Temperature NS Package Device

Number Accuracy Range Number Marking Transport Media

LM20BIM7
LM20BIM7X
LM20CIM7
LM20CIM7X
LM20SIBP

LM20SIBPX

www.national.com 2

±

2.5˚C −55˚C to +130˚C MAA05A T2B 1000 Units on Tape and Reel

±

2.5˚C −55˚C to +130˚C MAA05A T2B 3000 Units on Tape and Reel

±

5˚C −55˚C to +130˚C MAA05A T2C 1000 Units on Tape and Reel

±

5˚C −55˚C to +130˚C MAA05A T2C 3000 Units on Tape and Reel

±

3.5˚C −40˚C to +125˚C BPA04DDC Date

250 Units on Tape and Reel

Code

±

3.5˚C −40˚C to +125˚C BPA04DDC Date

3000 Units on Tape and Reel

Code

Absolute Maximum Ratings (Note 1)

Supply Voltage +6.5V to −0.2V
Output Voltage (V

Output Current 10 mA
Input Current at any pin (Note 2) 5 mA
Storage Temperature −65˚C to +150˚C
Maximum Junction Temperature (T

JMAX

ESD Susceptibility (Note 3) :

Human Body Model 2500 V
Machine Model 250 V

Electrical Characteristics

Unless otherwise noted, these specifications apply for V
other limits T

=

=

T

25˚C; Unless otherwise noted.

A

J

Parameter Conditions Typical

+

+ 0.6 V) to

−0.6 V

) +150˚C

+

=

Lead Temperature

SC-70 Package (Note 4) :

Vapor Phase (60 seconds) +215˚C
Infrared (15 seconds) +220˚C

Operating Ratings(Note 1)

Specified Temperature Range: T

LM20B, LM20C with

LM20B, LM20C with

LM20S with

LM20S with

Supply Voltage Range (V
Thermal Resistance, θ

SC-70
micro SMD

. Boldface limits apply for T

+2.7 V

DC

(Note 6)

+

2.4 V ≤ V

2.7 V ≤ V

2.4 V ≤ V

2.7 V ≤ V

≤ 2.7 V −30˚C ≤ TA≤ +130˚C

+

≤ 5.5 V −55˚C ≤ TA≤ +130˚C

+

≤ 5.5 V −30˚C ≤ TA≤ +125˚C

+

≤ 5.5 V −40˚C ≤ TA≤ +125˚C

+

(Note 5)

JA

LM20B LM20C LM20S Units

Limits Limits Limits

≤ TA≤ T

MIN

) +2.4 V to +5.5 V

415˚C/W

TBD˚C/W

=

=

T

A

to T

T

J

MIN

MAX

(Limit)

(Note 7) (Note 7) (Note 7)

Temperature to Voltage Error

=

(−3.88x10

V

O

+ (−1.15x10

−6xT2

)

−2

xT) + 1.8639V

(Note 8)

= +25˚C to +30˚C

T

A

T

= +130˚C

A

T

= +125˚C

A

T

= +100˚C

A

T

= +85˚C

A

T

= +80˚C

A

T

= 0˚C

A

T

= −30˚C

A

T

= −40˚C

A

T

= −55˚C

A

±

1.5

±

2.5

±

2.5

±

2.2

±

2.1

±

2.0

±

1.9

±

2.2

±

2.3

±

2.5

±

4.0

±

5.0 ˚C (max)

±

5.0

±

4.7

±

4.6

±

4.5

±

4.4

±

4.7

±

4.8

±

5.0 ˚C (max)

±

2.5 ˚C (max)

±

3.5 ˚C (max)

±

3.2 ˚C (max)

±

3.1 ˚C (max)

±

3.0 ˚C (max)

±

2.9 ˚C (max)

±

3.3 ˚C (min)

±

3.5 ˚C (max)

Output Voltage at 0˚C +1.8639 V
Variance from Curve
Non-Linearity (Note 9) −20˚C ≤ T
Sensor Gain (Temperature

−30˚C ≤ T

Sensitivity or Average Slope)

≤ +80˚C

A

≤ +100˚C −11.77 −11.4

A

±

1.0 ˚C

±

0.4

−12.2

−11.0

−12.6

−11.0

−12.6

mV/˚C (min)

mV/˚C (max)

%

to equation:

=

−11.77 mV/˚CxT+1.860V

V

O

Output Impedance 0 µA ≤ I

11, 12)

Load Regulation(Note 10) 0 µA ≤ I

11, 12)

Line Regulation +2. 4 V ≤ V

+5.0 V ≤ V

Quiescent Current +2. 4 V ≤ V

+2.4V≤V

Change of Quiescent Current +2. 4 V ≤ V

≤ +16 µA(Notes

L

≤ +16 µA(Notes

L

+

≤ +5.0V +3.3 +3.7 +3.7 mV/V (max)

+

≤ +5.5 V +8.8 +8.9 +8.9 mV (max)

+

≤ +5.5V 4.5 7 7 7 µA (max)

+

≤+5.0V 4.5 10 10 10 µA (max)

+

≤ +5.5V +0.7 µA

160 160 160 Ω (max)

−2.5 −2.5 −2.5 mV (max)

Temperature Coefficient of −11 nA/˚C
Quiescent Current
Shutdown Current V

+

≤ +0.8 V 0.02 µA

LM20

MAX

; all

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