Rainbow Electronics LM19 User Manual
LM19
2.4V, 10µA, TO-92 Temperature Sensor
General Description
The LM19 is a precision analog output CMOS integratedcircuit 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 LM19 is
predominately linear, yet has a slight predictable parabolic
curvature. The accuracy of the LM19 when specified to a
parabolic transfer function is
ture of +30˚C. The temperature error increases linearly and
reaches a maximum of
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 LM19’s quiescent current is less than 10 µA. Therefore,
self-heating is less than 0.02˚C in still air. Shutdown capability for the LM19 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.
±
2.5˚C at an ambient tempera-
±
3.8˚C at the temperature range
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 a TO-92 package
n Predictable curvature error
n Suitable for remote applications
Key Specifications
j
Accuracy at +30˚C
j
Accuracy at +130˚C & −55˚C±3.5 to±3.8 ˚C (max)
j
Power Supply Voltage Range +2.4V to +5.5V
j
Current Drain 10 µA (max)
j
Nonlinearity
j
Output Impedance 160 Ω (max)
j
Load Regulation
<
<
I
0µA
+16 µA −2.5 mV (max)
L
January 2003
±
2.5 ˚C (max)
±
0.4 % (typ)
LM19 2.4V, 10µA, TO-92 Temperature Sensor
Typical Application
VO= (−3.88x10−6xT2) + (−1.15x10−2xT) + 1.8639
or
where:
T is temperature, and V
is the measured output voltage of the LM19.
O
FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)
20004002
Operating from a Single Li-Ion Battery Cell
Output Voltage vs Temperature
20004024
© 2003 National Semiconductor Corporation DS200040 www.national.com
Typical Application (Continued)
LM19
Connection Diagram
Temperature (T) Typical V
+130˚C +303 mV
+100˚C +675 mV
+80˚C +919 mV
+30˚C +1515 mV
+25˚C +1574 mV
0˚C +1863.9 mV
−30˚C +2205 mV
−40˚C +2318 mV
−55˚C +2485 mV
TO-92
O
See NS Package Number Z03A
20004001
Ordering Information
Order Temperature Temperature NS Package Device
Number Accuracy Range Number Marking Transport Media
LM19CIZ
±
3.8˚C −55˚C to +130˚C Z03A LM19CIZ Bulk
www.national.com 2
LM19
Absolute Maximum Ratings (Note 1)
Supply Voltage +6.5V to −0.2V
Output Voltage (V
+
+ 0.6 V) to
Lead Temperature
TO-92 Package
Soldering (3 seconds dwell) +240˚C
−0.6 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
) +150˚C
JMAX
ESD Susceptibility (Note 3) :
Operating Ratings(Note 1)
Specified Temperature Range: T
2.4 V ≤ V+≤ 2.7 V −30˚C ≤ TA≤ +130˚C
2.7 V ≤ V
Supply Voltage Range (V
Thermal Resistance, θ
+
≤ 5.5 V −55˚C ≤ TA≤ +130˚C
+
) +2.4 V to +5.5 V
(Note 4)
JA
TO-92 150˚C/W
MIN
≤ TA≤ T
MAX
Human Body Model 2500 V
Machine Model 250 V
Electrical Characteristics
Unless otherwise noted, these specifications apply for V+= +2.7 VDC. Boldface limits apply for TA=TJ=T
other limits T
Parameter Conditions Typical
= 25˚C; Unless otherwise noted.
A=TJ
(Note 5)
LM19C Units
Limits
(Note 6)
Temperature to Voltage Error
= (−3.88x10−6xT2)
V
O
+ (−1.15x10
−2
xT) + 1.8639V
(Note 7)
= +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
±
2.5 ˚C (max)
±
3.5 ˚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)
±
3.8 ˚C (max)
Output Voltage at 0˚C +1.8639 V
Variance from Curve
Non-Linearity (Note 8) −20˚C ≤ T
Sensor Gain (Temperature
−30˚C ≤ T
Sensitivity or Average Slope)
≤ +80˚C
A
≤ +100˚C −11.77 −11.0
A
±
1.0 ˚C
±
0.4 %
−12.6
to equation:
=−11.77 mV/˚CxT+1.860V
V
O
Output Impedance 0 µA ≤ I
≤ +16 µA
L
160 Ω (max)
(Notes 10, 11)
Load Regulation(Note 9) 0 µA ≤ I
≤ +16 µA
L
−2.5 mV (max)
(Notes 10, 11)
Line Regulation +2. 4 V ≤ V+≤ +5.0V +3.7 mV/V (max)
+5.0 V ≤ V
Quiescent Current +2. 4 V ≤ V
+5.0V ≤ V
+2.4V≤ V
Change of Quiescent Current +2. 4 V ≤ V
+
≤ +5.5 V +11 mV (max)
+
≤ +5.0V 4.5 7 µA (max)
+
≤ +5.5V 4.5 9 µA (max)
+
≤ +5.0V 4.5 10 µA (max)
+
≤ +5.5V +0.7 µA
Temperature Coefficient of −11 nA/˚C
Quiescent Current
Shutdown Current V
+
≤ +0.8 V 0.02 µA
to T
MIN
MAX
(Limit)
mV/˚C (min)
mV/˚C (max)
; all
www.national.com3
Loading...