SNIS177B March   2013  – September 2015 LMT90

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 LMT90 Transfer Function
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Capacitive Loads
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Cost-Effective Alternative to Thermistors
  • Calibrated Directly in Degree Celsius (Centigrade)
  • Linear + 10.0 mV/°C Scale Factor
  • ±3°C Accuracy Guaranteed at 25°C
  • Specified for Full −40° to 125°C range
  • Suitable for Remote Applications
  • Operates from 4.5 V to 10 V
  • Less than 130-μA Current Drain
  • Low Self-heating, Less Than 0.2°C in Still Air
  • Non-linearity Less Than 0.8°C Over Temp

2 Applications

  • Industrial
  • HVAC
  • Disk Drives
  • Automotive
  • Portable Medical Instruments
  • Computers
  • Battery Management
  • Printers
  • Power Supply Modules
  • FAX Machines

3 Description

The LMT90 device is a precision integrated-circuit temperature sensor that can sense a −40°C to +125°C temperature range using a single positive supply. The output voltage of LMT90 is linearly proportional to Celsius (Centigrade) temperature (10 mV/°C) and has a DC offset of 500 mV. The offset allows reading negative temperatures without the need for a negative supply. The ideal output voltage of the LMT90 ranges from 100 mV to 1.75 V for a −40°C to 125°C temperature range. The LMT90 does not require any external calibration or trimming to provide accuracies of ±3°C at room temperature and ±4°C over the full −40°C to +125°C temperature range. Trimming and calibration of the LMT90 at the wafer level assure low cost and high accuracy. The linear output, 500-mV offset, and factory calibration of LMT90 simplify circuitry required in a single-supply environment where reading negative temperatures is required. The LMT90's quiescent current is less than 130 μA, thus self-heating is limited to a very low 0.2°C in still air.

The LMT90 is a cost-competitive alternative to thermistors.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMT90 SOT-23 (3) 2.92 mm × 1.30 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

LMT90 full_range_centigrade_temp_sensor_nis177.gif

Full-Range Centigrade Temperature Sensor (–40°C to +125°C)

LMT90 C001_SNIS177.png