LM62BIM3/NOPB - NATIONAL SEMICONDUCTOR

LM62

LM6 2 2.7V, 15.6 mV/C SOT-23 Temperature Sensor

Literature Number: SNIS105D

LM62

February 8, 2010

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 op-

erating 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 need for

a negative supply. The nominal output voltage of the LM62

ranges from +480 mV to +1884 mV for a 0°C to +90°C tem-

perature range. The LM62 is calibrated to provide accuracies

of ±2.0°C at room temperature and +2.5°C/−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 re-

quired. 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 in-

herent low power consumption allows it to be powered directly

from the output of many logic gates.

Features

■Calibrated linear scale factor of +15.6 mV/°C

■Rated for full 0°C to +90°C range with 3.0V supply

■Suitable for remote applications

Applications

■Cellular Phones

■Computers

■Power Supply Modules

■Battery Management

■FAX Machines

■Printers

■HVAC

■Disk Drives

■Appliances

Key Specifications

■Accuracy at 25°C ±2.0 or ±3.0°C (max)

■Temperature Slope +15.6 mV/°C

■Power Supply Voltage Range +2.7V to +10V

■Current Drain @ 25°C 130 μA (max)

■Nonlinearity ±0.8°C (max)

■Output Impedance 4.7 kΩ (max)

Connection Diagram

SOT-23

10089301

Top View

See NS Package Number mf03a

Ordering Information

Order Device

Number Top Mark Supplied As

LM62BIM3 T7B 1000 Units, Tape and Reel

LM62BIM3X T7B 3000 Units, Tape and Reel

LM62CIM3 T7C 1000 Units, Tape and Reel

LM62CIM3X T7C 3000 Units, Tape and Reel

Typical Application

10089302

VO = (+15.6 mV/°C × T°C) + 480 mV

Temperature (T) Typical VO

+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

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

Absolute Maximum Ratings (Note 1)

Supply Voltage +12V to −0.2V

Output Voltage (+VS + 0.6V) to −0.6V

Output Current 10 mA

Input Current at any pin (Note 2) 5 mA

Storage Temperature −65°C to +150°C

Junction Temperature, max

(TJMAX)+125°C

ESD Susceptibility (Note 3) :

Human Body Model 2500V

Machine Model 250V

Operating Ratings (Note 1)

Specified Temperature Range: TMIN ≤ TA ≤ TMAX

LM62B, LM62C 0°C ≤ TA ≤ +90°C

Supply Voltage Range (+VS)+2.7V to +10V

Thermal Resistance, θJA(Note 5)450°C/W

Soldering process must comply with National

Semiconductor's Reflow Temperature Profile specifications.

Refer to www.national.com/packaging. (Note 4)

Electrical Characteristics

Unless otherwise noted, these specifications apply for +VS = +3.0 VDC. Boldface limits apply for TA = TJ = TMIN to TMAX ; all other

limits TA = TJ = 25°C.

Parameter Conditions Typical

(Note 6)

LM62B LM62C Units

(Limit)

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 ≤ +VS ≤ +10V 4.7 4.7 kΩ (max)

0°C ≤ TA ≤ +75°C, +VS= +2.7V 4.4 4.4 kΩ (max)

Line Regulation (Note 10)+3.0V ≤ +VS ≤ +10V ±1.13 ±1.13 mV/V (max)

+2.7V ≤ +VS ≤ +3.3V, 0°C ≤ TA ≤ +75°C ±9.7 ±9.7 mV (max)

Quiescent Current +2.7V ≤ +VS ≤ +10V 82 130 130 μA (max)

165 165 μA (max)

Change of Quiescent Current +2.7V ≤ +VS ≤ +10V ±5 μA

Temperature Coefficient of 0.2 μA/°C

Quiescent Current

Long Term Stability (Note 11) TJ=TMAX=+100°C,

for 1000 hours ±0.2 °C

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 > +VS), 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 kΩ 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 (θJA) is specified without a heat sink in still air.

Note 6: Typicals are at TJ = TA = 25°C 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 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.

www.national.com 2

LM62

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

circuit board as shown in Figure 2.

Thermal Resistance

Junction to Air

10089303

Thermal Time Constant

10089304

Thermal Response in

Still Air with Heat Sink

10089305

Thermal Response

in Stirred Oil Bath

with Heat Sink

10089306

Thermal Response in Still

Air without a Heat Sink

10089308

Quiescent Current

vs. Temperature

10089309

3 www.national.com

LM62

Accuracy vs Temperature

10089310

Noise Voltage

10089311

Supply Voltage

vs Supply Current

10089312

Start-Up Response

10089322

Circuit Board

10089314

FIGURE 2. Printed Circuit Board Used for Heat Sink to Generate All Curves. ½″ Square Printed Circuit Board with 2 oz.

Copper Foil or Similar.

www.national.com 4

LM62

1.0 Mounting

The LM62 can be applied easily in the same way as other

integrated-circuit temperature sensors. It can be glued or ce-

mented to a surface. The temperature that the LM62 is sens-

ing will be within about +0.2°C of the surface temperature that

LM62'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 temper-

ature between the surface temperature and the air tempera-

ture.

To ensure good thermal conductivity the backside of the

LM62 die is directly attached to the GND pin. The lands and

traces to the LM62 will, of course, be part of the printed circuit

board, which is the object whose temperature is being mea-

sured. These printed circuit board lands and traces will not

cause the LM62's temperature to deviate from the desired

temperature.

Alternatively, the LM62 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 LM62 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 conden-

sation 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 LM62 or its connections.

The thermal resistance junction to ambient (θJA) is the pa-

rameter used to calculate the rise of a device junction tem-

perature due to its power dissipation. For the LM62 the

equation used to calculate the rise in the die temperature is

as follows:

TJ = TA + θJA [(+VS IQ) + (+VS − VO) IL]

where IQ is the quiescent current and ILis the load current on

the output. Since the LM62's junction temperature is the ac-

tual temperature being measured care should be taken to

minimize the load current that the LM62 is required to drive.

The table shown in Figure 3 summarizes the rise in die tem-

perature of the LM62 without any loading, and the thermal

resistance for different conditions.

SOT-23 SOT-23

no heat sink small heat fin

(Note 13) (Note 12)

θJA TJ − TAθJA TJ − TA

(°C/W) (°C) (°C/W) (°C)

Still air 450 0.17 260 0.1

Moving air 180 0.07

Note 12: Heat sink used is ½″ square printed circuit board with 2 oz. foil with

part attached as shown in Figure 2 .

Note 13: Part soldered to 30 gauge wire.

FIGURE 3. Temperature Rise of LM62 Due to

Self-Heating and Thermal Resistance (θJA)

2.0 Capacitive Loads

The LM62 handles capacitive loading well. Without any spe-

cial precautions, the LM62 can drive any capacitive load as

shown in Figure 4. Over the specified temperature range the

LM62 has a maximum output impedance of 4.7 kΩ. In an ex-

tremely noisy environment it may be necessary to add some

filtering to minimize noise pickup. It is recommended that

0.1 μF be added from +VS to GND to bypass the power supply

voltage, as shown in Figure 5. In a noisy environment it may

be necessary to add a capacitor from the output to ground. A

1 μF output capacitor with the 4.7 kΩ maximum output

impedance will form a 34 Hz lowpass filter. Since the thermal

time constant of the LM62 is much slower than the 30 ms time

constant formed by the RC, the overall response time of the

LM62 will not be significantly affected. For much larger ca-

pacitors this additional time lag will increase the overall re-

sponse time of the LM62.

10089315

FIGURE 4. LM62 No Decoupling Required for Capacitive

Load

10089316

FIGURE 5. LM62 with Filter for Noisy Environment

5 www.national.com

LM62

10089317

FIGURE 6. Simplified Schematic

3.0 Applications Circuits

10089318

FIGURE 7. Centigrade Thermostat

10089319

FIGURE 8. Conserving Power Dissipation with Shutdown

www.national.com 6

LM62

Physical Dimensions inches (millimeters) unless otherwise noted

SOT-23 Molded Small Outline Transistor Package (M3)

Order Number LM62BIM3 or LM62CIM3

NS Package Number mf03a

7 www.national.com

LM62

Notes

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

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