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LM45 데이터시트 PDF




National Semiconductor에서 제조한 전자 부품 LM45은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 LM45 자료 제공

부품번호 LM45 기능
기능 SOT-23 Precision Centigrade Temperature Sensors
제조업체 National Semiconductor
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LM45 데이터시트, 핀배열, 회로
July 1999
LM45
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit temperature
sensors, whose output voltage is linearly proportional to the
Celsius (Centigrade) temperature. The LM45 does not re-
quire any external calibration or trimming to provide accura-
cies of ±2˚C at room temperature and ±3˚C over a full −20 to
+100˚C temperature range. Low cost is assured by trimming
and calibration at the wafer level. The LM45’s low output im-
pedance, linear output, and precise inherent calibration
make interfacing to readout or control circuitry especially
easy. It can be used with a single power supply, or with plus
and minus supplies. As it draws only 120 µA from its supply,
it has very low self-heating, less than 0.2˚C in still air. The
LM45 is rated to operate over a −20˚ to +100˚C temperature
range.
Applications
n Battery Management
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
n Disk Drives
n Computers
n Automotive
Features
n Calibrated directly in ˚ Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n ±3˚C accuracy guaranteed
n Rated for full −20˚ to +100˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.0V to 10V
n Less than 120 µA current drain
n Low self-heating, 0.20˚C in still air
n Nonlinearity only ±0.8˚C max over temp
n Low impedance output, 20for 1 mA load
Connection Diagram
SOT-23
DS011754-1
Top View
See NS Package Number MA03B
Typical Applications
Order
Number
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
SOT-23
Device
Marking
T4B
T4B
T4C
T4C
Supplied As
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
DS011754-3
FIGURE 1. Basic Centigrade Temperature
Sensor (+2.5˚C to +100˚C)
© 1999 National Semiconductor Corporation DS011754
DS011754-4
Choose R1 = −VS/50 µA
VOUT= (10 mV/˚C x Temp ˚C)
VOUT = +1,000 mV at +100˚C
= +250 mV at +25˚C
= −200 mV at −20˚C
FIGURE 2. Full-Range Centigrade
Temperature Sensor (−20˚C to +100˚C)
www.national.com




LM45 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics To generate these curves the LM45 was mounted to a printed
circuit board as shown in Figure 3. (Continued)
Supply Voltage
vs Supply Current
Start-Up Response
DS011754-33
DS011754-34
DS011754-23
FIGURE 3. Printed Circuit Board Used for Heat Sink to Generate All Curves.
12" Square Printed Circuit Board with 2 oz. Foil or Similar
Applications
The LM45 can be applied easily in the same way as other
integrated-circuit temperature sensors. It can be glued or ce-
mented to a surface and its temperature will be within about
0.2˚C of the surface temperature.
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 ac-
tual temperature of the LM45 die would be at an intermediate
temperature between the surface temperature and the air
temperature.
To ensure good thermal conductivity the backside of the
LM45 die is directly attached to the GND pin. The lands and
traces to the LM45 will, of course, be part of the printed cir-
cuit board, which is the object whose temperature is being
measured. These printed circuit board lands and traces will
not cause the LM45s temperature to deviate from the de-
sired temperature.
Alternatively, the LM45 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 LM45 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 in-
sure that moisture cannot corrode the LM45 or its connec-
tions.
Temperature Rise of LM45 Due to Self-Heating
(Thermal Resistance)
SOT-23
SOT-23
no heat sink*
small heat fin**
Still air
450˚C/W
260˚C/W
Moving air
180˚C/W
* Part soldered to 30 gauge wire.
** Heat sink used is 12” square printed circuit board with 2 oz. foil with part at-
tached as shown in Figure 3.
www.national.com
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LM45 전자부품, 판매, 대치품
Typical Applications (Continued)
* =1% or 2% film resistor
-Trim RB for VB=3.075V
-Trim RC for VC=1.955V
-Trim RA for VA=0.075V + 100mV/˚C x Tambient
-Example, VA=2.275V at 22˚C
FIGURE 13. Bar-Graph Temperature Display (Dot Mode)
DS011754-20
DS011754-21
FIGURE 14. LM45 With Voltage-To-Frequency Converter And Isolated Output
(2.5˚C to +100˚C; 25 Hz to 1000 Hz)
7 www.national.com

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