7 Detailed Description

7.1 Overview

The LM50 device is a precision integrated-circuit temperature sensor that can sense a –40°C to 125°C

temperature range using a single positive supply. The output voltage of the LM50 has a positive temperature

slope of 10mV/°C. A 500mV offset is included enabling negative temperature sensing when biased by a single

supply.

The temperature-sensing element is comprised of a delta-VBE architecture. The temperature-sensing element is

then buffered by an amplifier and provided to the VO pin. The amplifier has a simple class A output stage with

typical 2kΩ output impedance as shown in the Functional Block Diagram.

7.2 Functional Block Diagram

*R2

≅ 2k with a typical 1300ppm/°C drift.

7.3 Feature Description

7.3.1 LM50 Transfer Function

The LM50 follow a simple linear transfer function to achieve the accuracy as listed in the Section 6.5 table.

Use Equation 1 to calculate the value of VO.

VO = 10mV/°C × T °C + 500mV

(1)

where

• T is the temperature in °C

• VO is the LM50 output voltage

7.4 Device Functional Modes

The only functional mode of the device has an analog output directly proportional to temperature.

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LM50

SNIS118H – JULY 1999 – REVISED MAY 2025

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