Rainbow Electronics LM61 User Manual

LM61

2.7V, SOT-23 or TO-92 Temperature Sensor

LM61 2.7V, SOT-23 or TO-92 Temperature Sensor

February 2004

General Description

The LM61 is a precision integrated-circuit temperature sen­sor that can sense a −30˚C to +100˚C temperature range
while operating from a single +2.7V supply. The LM61’s
output voltage is linearly proportional to Celsius (Centigrade)
temperature (+10 mV/˚C) and has a DC offset of +600 mV.
The offset allows reading negative temperatures without the
need for a negative supply. The nominal output voltage of the
LM61 ranges from +300 mV to +1600 mV for a −30˚C to
+100˚C temperature range. The LM61 is calibrated to pro­vide accuracies of
over the full −25˚C to +85˚C temperature range.

The LM61’s linear output, +600 mV offset, and factory cali­bration simplify external circuitry required in a single supply
environment where reading negative temperatures is re­quired. Because the LM61’s quiescent current is less than
125 µA, self-heating is limited to a very low 0.2˚C in still air.
Shutdown capability for the LM61 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±3˚C

Features

n Calibrated linear scale factor of +10 mV/˚C
n Rated for full −30˚ to +100˚C range
n Suitable for remote applications
n UL Recognized Component

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

j

Accuracy at 25˚C

j

Accuracy for −30˚C to +100˚C

j

Accuracy for −25˚C to +85˚C

j

Temperature Slope +10 mV/˚C

j

Power Supply Voltage Range +2.7V to +10V

j

Current Drain@25˚C 125 µA (max)

j

Nonlinearity

j

Output Impedance 800 Ω (max)

±

2.0 or±3.0˚C

±

4.0˚C (max)

±

3.0˚C (max)

±

0.8˚C (max)

(max)

Typical Application

FIGURE 1. Full-Range Centigrade Temperature Sensor (−30˚C to +100˚C)

01289702

VO= (+10 mV/˚C x T ˚C) + 600 mV

Temperature (T) Typical V

+100˚C +1600 mV

+85˚C +1450 mV

+25˚C +850 mV

0˚C +600 mV

−25˚C +350 mV

−30˚C +300 mV

Operating from a Single Li-Ion Battery Cell

O

© 2004 National Semiconductor Corporation DS012897 www.national.com

Connection Diagrams

LM61

SOT-23

TO-92

Top View

See NS Package Number MA03B

01289701

Ordering Information

Order

Number

LM61BIM3 T1B 1000 Units on Tape and Reel

LM61BIM3X T1B 3000 Units on Tape and Reel

LM61CIM3 T1C 1000 Units on Tape and Reel

LM61CIM3X T1C 3000 Units on Tape and Reel

LM61BIZ LM61BIZ Bulk

LM61CIZ LM61CIZ Bulk

Device

Marking

Supplied In

See NS Package Number Z03A

Accuracy

Over

Specified

Temperature

Range (˚C)

±

3 −25˚C to +85˚C

±

4 −30˚C to +100˚C

±

3 −25˚C to +85˚C

±

4 −30˚C to +100˚C

Specified

Temperature

Range

01289725

Package

Type

SOT-23

TO-92

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LM61

Absolute Maximum Ratings (Note 1)

Supply Voltage +12V to −0.2V

Output Voltage (+V

+ 0.6V) to

S

−0.6V

Soldering (10 seconds) +260˚C

SOT-23 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

Machine Model 250V

Lead Temperature:

Operating Ratings(Note 1)

Specified Temperature Range: T

LM61C −30˚C ≤ TA≤ +100˚C

LM61B −25˚C ≤ T

Supply Voltage Range (+V

Thermal Resistance, θ

) +2.7V to +10V

S

(Note 5)

JA

SOT-23
TO-92

MIN

≤ TA≤ T

≤ +85˚C

A

450˚C/W
180˚C/W

MAX

TO-92 Package:

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)

LM61B LM61C Units

Limits Limits

(Note 7) (Note 7)

Accuracy (Note 8)

±

2.0

±

3.0

±

3.0 ˚C (max)

±

4.0 ˚C (max)

Output Voltage at 0˚C +600 mV

Nonlinearity (Note 9)

±

0.6

±

0.8 ˚C (max)

Sensor Gain +10 +9.7 +9.6 mV/˚C (min)

(Average Slope) +10.3 +10.4 mV/˚C (max)

Output Impedance +3.0V ≤ +V

−30˚C ≤ T
+85˚C ≤ T

Line Regulation (Note 10) +3.0V ≤ +V

+2.7V ≤ +V

Quiescent Current +2.7V ≤ +V

≤ +10V

S

≤ +85˚C, +VS= +2.7V

A

≤ +100˚C, +VS= +2.7V

A

≤ +10V

S

≤ +3.3V

S

≤ +10V 82 125 125 µA (max)

S

±
±

0.8

2.3
5

0.7

5.7

0.8

2.3
5

±

0.7 mV/V (max)

±

5.7 mV (max)

155 155 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 +10 mV/˚C times the device’s case temperature plus 600 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.

) 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)

kΩ (max)
kΩ (max)
kΩ (max)

; all

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