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

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(3)
MIN MAX UNIT
Supply Voltage −0.2 6.5 V
Output Voltage −0.6 (V+ + 0.6 ) V
Output Current 10 mA
Input Current at any pin(2) 5 mA
Maximum Junction Temperature (TJMAX) 150 °C
Storage temperature, Tstg −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA.
(3) Soldering process must comply with TI's Reflow Temperature Profile specifications. Refer to http://www.ti.com/packaging.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2500 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±250
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
LM20B, LM20C with   2.4 V ≤ V+≤ 2.7 V −30 130 °C
LM20B, LM20C with   2.7 V ≤ V+≤ 5.5 V −55 130 °C
LM20S with   2.4 V ≤ V+≤ 5.5 V −30 125 °C
LM20S with   2.7 V ≤ V+≤ 5.5 V −40 125 °C
Supply Voltage Range (V+) 2.4 5.5 V
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6.4 Thermal Information

THERMAL METRIC(1) LM20 UNIT
DCK (SC70) YZR (DSBGA)
5 PINS 4 PINS
RθJA Junction-to-ambient thermal resistance 282 197 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 93 2
RθJB Junction-to-board thermal resistance 62 40
ψJT Junction-to-top characterization parameter 1.6 11
ψJB Junction-to-board characterization parameter 62 40
RθJC(bot) Junction-to-case (bottom) thermal resistance — —
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics: LM20B

Unless otherwise noted, these specifications apply for V+ = 2.7 VDC. All limits TA = TJ = TMIN to TMAX, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT
Temperature to Voltage Error
VO = (−3.88×10−6× T 2) + (−1.15×10−2× T) + 1.8639 V(3)		 TA = 25°C to 30°C –1.5 1.5 °C
TA = 130°C –2.5 2.5 °C
TA = 125°C –2.5 2.5 °C
TA = 100°C –2.2 2.2 °C
TA = 85°C –2.1 2.1 °C
TA = 80°C –2.0 2.0 °C
TA = 0°C –1.9 1.9 °C
TA = –30°C –2.2 2.2 °C
TA = –40°C –2.3 2.3 °C
TA = –55°C –2.5 2.5 °C
Output Voltage at 0°C 1.8639 V
Variance from Curve ±1.0 °C
Non-linearity(4) –20°C ≤ TA ≤ 80°C ±0.4%
Sensor Gain (Temperature Sensitivity or Average Slope) to equation:
VO=−11.77 mV / °C×T+1.860 V		 –30°C ≤ TA ≤ 100°C –12.2 –11.77 –11.4 mV/°C
Output Impedance Sourcing IL 0 μA to 16 μA(6)(7) 160 Ω
Load Regulation(5) Sourcing IL 0 μA to 16 μA(3)(7) –2.5 mV
Line Regulation(8) 2.4 V ≤ V+ ≤ 5.0 V 3.3 mV/V
5.0 V ≤ V+ ≤ 5.5 V 11 mV
Quiescent Current 2.4 V ≤ V+ ≤ 5.0 V; TA = 25°C 4.5 7 μA
5.0 V ≤ V+ ≤ 5.5 V; TA = 25°C 4.5 9 μA
2.4 V ≤ V+ ≤ 5.0 V 4.5 10 μA
Change of Quiescent Current 2.4 V ≤ V+ ≤ 5.5 V 0.7 μA
Temperature Coefficient of Quiescent Current –11 nA/°C
Shutdown Current V+ ≤ 0.8 V 0.02 μA
(1) Limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(2) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(3) Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed in °C).
(4) Non-linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the temperature range specified.
(5) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance.
(6) The LM20 can at most sink 1 μA and source 16 μA.
(7) Load regulation or output impedance specifications apply over the supply voltage range of 2.4 V to 5.5 V.
(8) Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply input voltage.

6.6 Electrical Characteristics: LM20C

Unless otherwise noted, these specifications apply for V+ = 2.7 VDC. All limits TA = TJ = TMIN to TMAX, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT
Temperature to Voltage Error
VO = (−3.88×10−6× T 2) + (−1.15×10−2× T) + 1.8639 V(3)		 TA = 25°C to 30°C –4 5 °C
TA = 130°C –5 5 °C
TA = 125°C –5 5 °C
TA = 100°C –4.7 4.7 °C
TA = 85°C –4.6 4.6 °C
TA = 80°C –4.5 4.5 °C
TA = 0°C –4.4 4.4 °C
TA = –30°C –4.7 4.7 °C
TA = –40°C –4.8 4.8 °C
TA = –55°C –5.0 5.0 °C
Output Voltage at 0°C 1.8639 V
Variance from Curve ±1.0 °C
Non-Linearity (4) –20°C ≤ TA ≤ 80°C ±0.4%
Sensor Gain (Temperature Sensitivity or Average Slope) to equation:
VO=−11.77 mV / °C×T+1.860 V		 –30°C ≤ TA ≤ 100°C –12.6 –11.77 –11.0 mV/°C
Output Impedance Sourcing IL 0 μA to 16 μA (6)(7) 160 Ω
Load Regulation(5) Sourcing IL 0 μA to 16 μA (6)(7) –2.5 mV
Line Regulation(8) 2.4 V ≤ V+ ≤ 5.0 V 3.7 mV/V
5.0 V ≤ V+ ≤ 5.5 V 11 mV
Quiescent Current 2.4 V ≤ V+ ≤ 5.0 V; TA = 25°C 4.5 7 μA
5.0 V ≤ V+ ≤ 5.5 V; TA = 25°C 4.5 9 μA
2.4 V ≤ V+ ≤ 5.0 V 4.5 10 μA
Change of Quiescent Current 2.4 V ≤ V+ ≤ 5.5 V 0.7 μA
Temperature Coefficient of Quiescent Current –11 nA/°C
Shutdown Current V+ ≤ 0.8 V 0.02 μA
(1) Limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(2) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(3) Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed in °C).
(4) Non-linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the temperature range specified.
(5) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance.
(6) The LM20 can at most sink 1 μA and source 16 μA.
(7) Load regulation or output impedance specifications apply over the supply voltage range of 2.4 V to 5.5 V.
(8) Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply input voltage.

6.7 Electrical Characteristics: LM20S

Unless otherwise noted, these specifications apply for V+ = 2.7 VDC. All limits TA = TJ = TMIN to TMAX, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT
Temperature to Voltage Error
VO = (−3.88×10−6×T 2) + (−1.15×10−2× T) + 1.8639 V(3)		 TA = 25°C to 30°C –2.5 ±1.5 2.5 °C
TA = 125°C –3.5 3.5 °C
TA = 100°C –3.2 3.2 °C
TA = 85°C –3.1 3.1 °C
TA = 80°C –3.0 3.0 °C
TA = 0°C –2.9 2.9 °C
TA = –30°C –3.3 3.3 °C
TA = –40°C –3.5 3.5 °C
Output Voltage at 0°C 1.8639 V
Variance from Curve ±1.0 °C
Non-Linearity (4) –20°C ≤ TA ≤ 80°C ±0.4%
Sensor Gain (Temperature Sensitivity or Average Slope) to equation:
VO= −11.77 mV/ °C × T + 1.860 V		 –30°C ≤ TA ≤ 100°C –12.6 –11.77 –11.0 mV/°C
Output Impedance Sourcing IL 0 μA to 16 μA(6)(7) 160 Ω
Load Regulation(5) Sourcing IL 0 μA to 16 μA(6)(7) –2.5 mV
Line Regulation(8) 2.4 V ≤ V+ ≤ 5.0 V 3.7 mV/V
5.0 V ≤ V+ ≤ 5.5 V 11 mV
Quiescent Current 2.4 V ≤ V+ ≤ 5.0 V; TA = 25°C 4.5 7 μA
5.0 V ≤ V+ ≤ 5.5 V; TA = 25°C 4.5 9 μA
2.4 V ≤ V+ ≤ 5.0 V 4.5 10 μA
Change of Quiescent Current 2.4 V ≤ V+ ≤ 5.5 V 0.7 μA
Temperature Coefficient of Quiescent Current –11 nA/°C
Shutdown Current V+ ≤ 0.8 V 0.02 μA
(1) Limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(2) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(3) Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed in °C).
(4) Non-linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the temperature range specified.
(5) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance.
(6) The LM20 can at most sink 1 μA and source 16 μA.
(7) Load regulation or output impedance specifications apply over the supply voltage range of 2.4 V to 5.5 V.
(8) Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply input voltage.

6.8 Typical Characteristics

10090825.pngFigure 1. Temperature Error vs Temperature