1 Features

• Industry-Standard Sensor Gain/Offset:

– 10mV/°C, 500mV at 0°C

– Drop-in functional equivalent to LM50C

• LMT90 Temperature Accuracy:

– ±3°C (Max) at 25°C

– ±4°C (Max) over −40°C to +125°C

• 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

• Cost-Effective Alternative to Thermistors

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 LMT90 device is a cost-optimized precision

analog temperature sensor developed as a linear

alternative to discrete thermistors. This device 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 LMT90 ranges from 100mV (at –40°C) to 1.75V

(at 125°C), simplifying analog-to-digital converter

(ADC) interfacing.

The LMT90 is a drop-in equivalent to LM50C and

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 LMT90 (typically

around 95μA), self-heating is limited to a very low

0.2°C (in still air). This device is suitable for HVAC,

appliance, and consumer electronics applications.

Trimming and calibration of the LMT90 at the

wafer level supports long-term availability, low cost

and consistent accuracy (±3°C at 25°C, ±4°C over

temperature range).