Rainbow Electronics LM62 User Manual

LM62

2.7V, 15.6 mV/˚C SOT-23 Temperature Sensor

General Description

The LM62 is a precision integrated-circuit temperature sen­sor that can sense a 0˚C to +90˚C temperature range while
operating from a single +3.0V supply. The LM62’s output
voltage is linearly proportional to Celsius (Centigrade) tem­perature (+15.6 mV/˚C) and has a DC offset of +480 mV.
The offset allows reading temperatures down to 0˚C without
the needforanegative supply.The nominal output voltage of
the LM62 ranges from +480 mV to +1884 mV for a 0˚C to
+90˚C temperature range. The LM62 is calibrated to provide
accuracies of

−2.0˚C over the full 0˚C to +90˚C temperature range.
The LM62’s linear output, +480 mV offset, and factory cali-

bration simplify external circuitry required in a single supply
environment where reading temperatures down to 0˚C is
required. Because the LM62’s quiescent current is less than
130 µA, self-heating is limited to a very low 0.2˚C in still air.
Shutdown capability for the LM62 is intrinsic because its
inherent low power consumption allows it to be powered
directly from the output of many logic gates.

±

2.0˚C at room temperature and +2.5˚C/

Features

n Calibrated linear scale factor of +15.6 mV/˚C

n Rated for full 0˚C to +90˚C range with 3.0V supply
n Suitable for remote applications

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

Key Specifications

n Accuracy at 25˚C
n Temperature Slope +15.6 mV/˚C
n Power Supply Voltage Range +2.7V to +10V
n Current Drain
n Nonlinearity
n Output Impedance 4.7 kΩ (max)

@

25˚C 130 µA (max)

June 1999

±

2.0 or±3.0˚C (max)

±

0.8˚C (max)

LM62 2.7V, 15.6 mV/˚C, SOT-23 Temperature Sensor

Connection Diagram

SOT-23

DS100893-1

Top View

See NS Package Number MA03B

Ordering Information

Order SOT-23

Number Device Supplied As

Marking

LM62BIM3 T7B 1000 Units on Tape and Reel
LM62BIM3X T7B 3000 Units on Tape and Reel
LM62CIM3 T7C 1000 Units on Tape and Reel
LM62CIM3X T7C 3000 Units on Tape and Reel

Typical Application

DS100893-2

VO= (+15.6 mV/˚C x T˚C) + 480 mV

Temperature (T) Typical V

+90˚C +1884 mV
+70˚C +1572 mV
+25˚C 870 mV

0˚C +480 mV

FIGURE 1. Full-Range Centigrade Temperature Sensor

(0˚C to +90˚C) Stabilizing a Crystal Oscillator

O

© 2001 National Semiconductor Corporation DS100893 www.national.com

Absolute Maximum Ratings (Note 1)

LM62

Supply Voltage +12V to −0.2V
Output Voltage (+V

+ 0.6V) to

S

−0.6V

Lead Temperature:

SOT Package (Note 4) :

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

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

) +125˚C

JMAX

ESD Susceptibility (Note 3) :

Human Body Model 2500V

Operating Ratings(Note 1)

Specified Temperature Range: T

LM62B, LM62C 0˚C ≤ TA≤ +90˚C
Supply Voltage Range (+V
Thermal Resistance, θ

) +2.7V to +10V

S

(Note 5) 450˚C/W

JA

MIN

≤ TA≤ T

Machine Model 250V

Electrical Characteristics

Unless otherwise noted, these specifications apply for +VS= +3.0 VDC. Boldface limits apply for TA=TJ=T
other limits T

Parameter Conditions Typical

A=TJ

= 25˚C.

(Note 6)

LM62B LM62C Units

Limits Limits

(Note 7) (Note 7)

Accuracy (Note 8)

±

2.0

±

3.0 ˚C (max)

+2.5/−2.0 +4.0/−3.0 ˚C (max)
Output Voltage at 0˚C +480 mV
Nonlinearity (Note 9)

±

0.8

±

1.0 ˚C (max)

Sensor Gain +16 +16.1 +16.3 mV/˚C (max)
(Average Slope) +15.1 +14.9 mV/˚C (min)
Output Impedance +3.0V ≤ +V

0˚C ≤ T

Line Regulation (Note 10) +3.0V ≤ +V

+2.7V ≤ +V

Quiescent Current +2.7V ≤ +V

≤ +10V 4.7 4.7 kΩ (max)

S

≤ +75˚C, +VS= +2.7V 4.4 4.4 kΩ (max)

A

≤ +10V

S

≤ +3.3V, 0˚C ≤ TA≤ +75˚C

S

≤ +10V 82 130 130 µA (max)

S

±

±

1.13

9.7

±

1.13 mV/V (max)

±

9.7 mV (max)

165 165 µA (max)

Change of Quiescent Current +2.7V ≤ +V

≤ +10V

S

±

5µA
Temperature Coefficient of 0.2 µA/˚C
Quiescent Current
Long Term Stability (Note 11) T

for 1000 hours

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 (V
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.
Note 4: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in any post 1986 National

Semiconductor Linear Data Book for other methods of soldering surface mount devices.

Note 5: The junction to ambient thermal resistance (θ
Note 6: Typicals are at T
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Accuracy is defined as the error between the output voltage and +15.6 mV/˚C times the device’s case temperature plus 480 mV, at specified conditions of

voltage, current, and temperature (expressed in ˚C).
Note 9: 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 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: 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
majority 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.

) at any pin exceeds power supplies (V

I

= 25˚C and represent most likely parametric norm.

J=TA

J=TMAX

=+100˚C,

<

GND or V

I

) is specified without a heat sink in still air.

JA

±

0.2 ˚C

>

+VS), the current at that pin should be limited to 5 mA.

I

MIN

to T

MAX

(Limit)

MAX

; all

www.national.com 2

Typical Performance Characteristics To generate these curves the LM62 was mounted to a printed

circuit board as shown in

Figure 2

.

LM62

Thermal Resistance
Junction to Air

Thermal Response
in Stirred Oil Bath
with Heat Sink

DS100893-3

Thermal Time Constant

Thermal Response in Still
Air without a Heat Sink

DS100893-4

Thermal Response in
Still Air with Heat Sink

DS100893-5

Quiescent Current
vs. Temperature

DS100893-6

DS100893-9

Accuracy vs Temperature

DS100893-8

DS100893-10

Noise Voltage

DS100893-11

www.national.com3