NSC LM61CIZ, LM61CIM3, LM61BIM3, LM61BIZ Datasheet
LM61
2.7V, SOT-23 or TO-92 Temperature Sensor
LM61 2.7V, SOT-23 or TO-92 Temperature Sensor
June 1999
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 +600mV.
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, +600mV 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
Typical Application
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 Accuracy for −30˚C to +100˚C
n Accuracy for −25˚C to +85˚C
n Temperature Slope +10 mV/˚C
n Power Supply Voltage Range +2.7V to +10V
n Current Drain
n Nonlinearity
n Output Impedance 800 Ω (max)
@
25˚C 125 µA (max)
±
2.0 or±3.0˚C
(max)
±
4.0˚C (max)
±
3.0˚C (max)
±
0.8˚C (max)
DS012897-2
=
V
(+10 mV/˚C x T ˚C) + 600 mV
O
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
FIGURE 1. Full-Range Centigrade Temperature Sensor (−30˚C to +100˚C)
Operating from a Single Li-Ion Battery Cell
© 1999 National Semiconductor Corporation DS012897 www.national.com
O
Connection Diagrams
SOT-23
DS012897-1
See NS Package Number MA03B
Top View
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
TO-92
DS012897-25
Top View
Specified
Temperature
Range
Package
Type
SOT-23
TO-92
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Absolute Maximum Ratings (Note 1)
Supply Voltage +12V 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
) +125˚C
(T
JMAX
ESD Susceptibility (Note 3) :
Human Body Model 2500V
Machine Model 250V
+ 0.6V) to
S
−0.6V
Lead Temperature:
TO-92 Package:
Soldering (10 seconds) +260˚C
SOT-23 Package (Note 4):
Vapor Phase (60 seconds) +215˚C
Infrared (15 seconds) +220˚C
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
SOT-23
TO-92
) +2.7V to +10V
S
(Note 5)
JA
MIN
≤ TA≤ T
≤ +85˚C
A
450˚C/W
180˚C/W
MAX
Electrical Characteristics
Unless otherwise noted, these specifications apply for +V
other limits T
=
=
T
25˚C.
A
J
Parameter Conditions Typical
=
S
. Boldface limits apply for T
+3.0 V
DC
(Note 6)
LM61B LM61C Units
Limits Limits
(Note 7) (Note 7)
Accuracy (Note 8)
±
±
Output Voltage at 0˚C +600 mV
Nonlinearity (Note 9)
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
Change of Quiescent Current +2.7V ≤ +V
≤ +10V
S
≤ +85˚C, +V
A
≤ +100˚C, +V
A
≤ +10V
S
≤ +3.3V
S
≤ +10V 82 125 125 µA (max)
S
≤ +10V
S
S
=
=
S
+2.7V
+2.7V
±
5µA
Temperature Coefficient of 0.2 µA/˚C
Quiescent Current
=
Long Term Stability (Note 11) T
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 di-
rectly 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 Semi-
conductor 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 volt-
age, 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 com-
puted 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
=
=
T
25˚C and represent most likely parametric norm.
J
A
=
T
+100˚C,
J
MAX
for 1000 hours
JA
<
I
) is specified without a heat sink in still air.
GND or V
>
+VS), the current at that pin should be limited to 5 mA.
I
±
0.2 ˚C
±
0.8
2.3
±
±
155 155 µA (max)
2.0
3.0
0.6
5
0.7
5.7
=
=
T
A
T
J
MIN
±
3.0 ˚C (max)
±
4.0 ˚C (max)
±
0.8 ˚C (max)
0.8
2.3
5
±
0.7 mV/V (max)
±
5.7 mV (max)
to T
MAX
(Limit)
kΩ (max)
kΩ (max)
kΩ (max)
; all
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