Texas Instruments LMT90 Handleiding

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LMT90 Industry-Standard, ±3°C Accurate, Analog Centigrade (10mV/°C) Temperature

Sensor in SOT-23 Package

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).

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LMT90 DBZ (SOT-23, 3)2.37mm × 2.92mm

(1)For more information, see Section 11.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

GND

V

O

+V

S

Thermal Diodes

2k



+

–

MSPM0

MCU

ADC

C

Load

GND

VCC

VCC

C

Bypass

LMT90

Simplified Schematic

DUTTemperature(



C)

OutputVoltage(V)

-50-250255075100125150

0

0.25

0.5

0.75

1

1.25

1.5

1.75

2

1.75

0.75

0.1

V

O

=(+10mV/°C×T°C)+500mV

Full-Range Centigrade Temperature Sensor (–40°C

to 125°C)

LMT90

SNIS177C – MARCH 2013 – REVISED MAY 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties