SNIS106Q December   1999  – January 2015 LM20

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: LM20B
    6. 6.6 Electrical Characteristics: LM20C
    7. 6.7 Electrical Characteristics: LM20S
    8. 6.8 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 LM20 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. 8.1.2 LM20 DSBGA Light Sensitivity
    2. 8.2 Typical Applications
      1. 8.2.1 Full-Range Celsius (Centigrade) Temperature Sensor (−55°C to 130°C) Operating from a Single Li-Ion Battery Cell
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Centigrade Thermostat
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
    3. 8.3 System Examples
      1. 8.3.1 Conserving Power Dissipation With Shutdown
      2. 8.3.2 Analog-to-Digital Converter Input Stage
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Rated for −55°C to 130°C Range
  • Available in SC70 and DSBGA Package
  • Predictable Curvature Error
  • Suitable for Remote Applications
  • Accuracy at 30°C ±1.5 to ±4°C (Maximum)
  • Accuracy at 130°C and −55°C ±2.5 to ±5°C (Maximum)
  • Power Supply Voltage Range 2.4 V to 5.5 V
  • Current Drain 10 μA (Maximum)
  • Nonlinearity ±0.4% (Typical)
  • Output Impedance 160 Ω (Maximum)
  • Load Regulation
       0 μA < IL< 16 μA −2.5 mV (Maximum)

2 Applications

  • Cellular Phones
  • Computers
  • Power Supply Modules
  • Battery Management
  • FAX Machines
  • Printers
  • HVAC
  • Disk Drives
  • Appliances

3 Description

The LM20 is a precision analog output CMOS integrated-circuit temperature sensor that operates over −55°C to 130°C. The power supply operating range is 2.4 V to 5.5 V. The transfer function of LM20 is predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM20 when specified to a parabolic transfer function is ±1.5°C at an ambient temperature of 30°C. The temperature error increases linearly and reaches a maximum of ±2.5°C at the temperature range extremes. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V, the temperature range extremes are 130°C and −55°C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive extreme remains at 130°C.

The LM20 quiescent current is less than 10 μA. Therefore, self-heating is less than 0.02°C in still air. Shutdown capability for the LM20 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates or does not necessitate shutdown.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM20 SC70 (5) 2.00 mm × 1.25 mm
DSBGA (4) 0.96 mm × 0.96 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

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Output Voltage vs Temperature

output_voltage_vs_temperature_snis106.gif