7 Detailed Description

7.1 Overview

The LM50 and LM50HV devices are precision integrated-circuit temperature sensor that can sense a -40°C to

125°C (for LM50) or -40°C to 150°C (for LM50HV) temperature range using a single positive supply. The output

voltage of the LM50 and LM50HV 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 and LM50HVTransfer Function

The LM50 and LM50HV follow a simple linear transfer function to achieve the accuracy as listed in the Section

6.5 and Section 6.6 tables.

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 and LM50HV 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, LM50HV

SNIS118I – JULY 1999 – REVISED OCTOBER 2025

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Product Folder Links: LM50 LM50HV