8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The LM50 and LM50HV have a wide supply range and a 10mV/°C output slope with a 500mV DC offset.

Therefore, these devices can be easily placed in many temperature-sensing applications where a single supply

is required for positive and negative temperatures. The LM50HV device is designed for LDO-less applications

with power supply rails of 12V, 24V, 36V due to stable functionality across wide supply range of 3V to 36V.

8.2 Typical Application

8.2.1 Full-Range Centigrade Temperature Sensor

LM50

+VS

(4.5V to 10V)

VO (Output)

LM50HV

+VS

(3V to 36V)

VO (Output)

Figure 8-1. Full-Range Centigrade Temperature Sensor LM50 (–40°C to 125°C) and LM50HV (–40°C to

150°C)

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 8-1 as the input parameters.

Table 8-1. Design Parameters

PARAMETER

VALUE (LM50)

VALUE (LM50HV)

Power supply voltage

4.5V to 10V

3V to 36V

Output impedance

4kΩ (maximum)

4kΩ (maximum)

Accuracy at 25°C

±2°C/±3°C (maximum)

±1°C (typical)

Accuracy over –10°C to 125°C

-3.5/+3°C/±4°C (maximum)

±2.5°C (maximum)

Accuracy over –40°C to 125°C

±3.5°C (maximum)

Accuracy over –20°C to 150°C

-

±3°C (maximum)

Accuracy over –40°C to 150°C

-

±3.5°C (maximum)

Temperature slope

10mV/°C

10mV/°C

8.2.1.2 Detailed Design Procedure

The LM50 and LM50HV are simple temperature sensors that provide an analog output. Therefore design

requirements related to layout are more important than other requirements. See Layout for more information.

8.2.1.2.1 Capacitive Bypass and Loads

The LM50 and LM50HV devices handle capacitive loading very well. Without any special precautions, the LM50

and LM50HV can drive capacitive load up to 1μF. These devices have a nominal 2kΩ output impedance (shown

in Functional Block Diagram). The temperature coefficient of the output resistors is approximately 1300ppm/°C.

LM50, LM50HV

SNIS118I – JULY 1999 – REVISED OCTOBER 2025

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