LM50_06 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – SOT-23 Single-Supply Centigrade Temperature Sensor

February 2006
LM50
SOT-23 Single-Supply Centigrade Temperature Sensor
General Description
The LM50 is a precision integrated-circuit temperature sen-
sor that can sense a −40˚C to +125˚C temperature range
using a single positive supply. The LM50’s output voltage is
linearly proportional to Celsius (Centigrade) temperature
(+10 mV/˚C) and has a DC offset of +500 mV. The offset
allows reading negative temperatures without the need for a
negative supply. The ideal output voltage of the LM50 ranges
from +100 mV to +1.75V for a −40˚C to +125˚C temperature
range. The LM50 does not require any external calibration or
trimming to provide accuracies of ±3˚C at room temperature
and ±4˚C over the full −40˚C to +125˚C temperature range.
Trimming and calibration of the LM50 at the wafer level
assure low cost and high accuracy. The LM50’s linear out-
put, +500 mV offset, and factory calibration simplify circuitry
required in a single supply environment where reading nega-
tive temperatures is required. Because the LM50’s quiescent
current is less than 130 µA, self-heating is limited to a very
low 0.2˚C in still air.
Applications
n Computers
n Disk Drives
n Battery Management
n Automotive
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
Features
n Calibrated directly in degree Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
n ±2˚C accuracy guaranteed at +25˚C
n Specified for full −40˚ to +125˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.5V to 10V
n Less than 130 µA current drain
n Low self-heating, less than 0.2˚C in still air
n Nonlinearity less than 0.8˚C over temp
n UL Recognized Component
Connection Diagram
SOT-23
01203001
Top View
See NS Package Number mf03A
Order
Number
LM50BIM3
LM50CIM3
LM50BIM3X
LM50CIM3X
Device
Top Mark
T5B
T5C
T5B
T5C
Supplied As
1000 Units on Tape
and Reel
1000 Units on Tape
and Reel
3000 Units on Tape
and Reel
3000 Units on Tape
and Reel
© 2006 National Semiconductor Corporation DS012030
www.national.com