1 Features

• Industry-Standard Sensor Gain/Offset:

– 10mV/°C, 500mV at 0°C

• LM50B Temperature Accuracy:

– ±2°C (Max) at 25°C

– ±3°C (Max) over temperature range

• LM50C Temperature Accuracy:

– ±3°C (Max) at 25°C

– ±4°C (Max) over temperature range

• Operating supply range: 4.5V to 10V

• Quiescent Current (Typ): 95μA

• Available in Standard SOT23-3 package

• Nonlinearity: ±0.8°C (Max)

• DC Output Impedance: 2kΩ/4kΩ (typ/Max)

– Enables driving large capacitive loads

• UL Recognized Component

2 Applications

• Mobile phones, PC & notebooks

• Data storage

• Battery Management

• Home and Multifunction printers

• Medical and healthcare Instruments

• HVAC System

• Power Supply Modules

3 Description

The LM50 device is a precision analog temperature

sensor that can measure temperatures from -40°C

to 125°C using a single positive supply. The output

voltage of the device is linearly proportional to

temperature (10mV/°C) and has a DC offset of

500mV at 0°C. The offset allows reading negative

temperatures without the need for a negative supply.

The output voltage of the LM50 ranges from 100mV

(at –40°C) to 1.75V (at 125°C), simplifying analog-todigital

converter (ADC) interfacing.

Unlike NTC thermistors, LM50 does not require any

external calibration, trimming or software linearization

leading to simplifying the circuitry requirements in

a single supply environment. Due to low quiescent

current of LM50 (typically around 95μA), self-heating

is limited to a very low 0.2°C (in still air) and the

device is designed for remote or battery-powered

applications. Trimming and calibration of the LM50 at

the wafer level provide long-term availability, low cost

and consistent accuracy in two grades: LM50B (±2°C

at 25°C, ±3°C over temperature range) and LM50C

(±3°C at 25°C, ±4°C over temperature range).