SBOS600F July   2018  – July 2026 REF20

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Parameter Measurement Information
    1. 7.1 Solder Heat Shift
    2. 7.2 Long-Term Stability
    3. 7.3 Thermal Hysteresis
    4. 7.4 Noise Performance
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 VREF and VBIAS Tracking
      2. 8.3.2 Low Temperature Drift
      3. 8.3.3 Load Current
    4. 8.4 Device Functional Modes
  10. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Low-Side, Current-Sensing Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Shunt Resistor
          2. 9.2.1.2.2 Differential Amplifier
          3. 9.2.1.2.3 Voltage Reference
          4. 9.2.1.2.4 Results
        3. 9.2.1.3 Application Curves
    3. 9.3 Power-Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Refer to the PDF data sheet for device specific package drawings
9.2.1.2.3 Voltage Reference

Confirm that the voltage reference for this application includes following features:

  1. Dual output (3.0V and 1.5V)
  2. Low drift
  3. Low tracking errors between the two outputs

For this design, the REF2030 is used. The REF20xx topology is as shown in Section 8.2.

The REF2030 is an excellent choice for this application because of the dual output. The temperature drift of 8ppm/°C and initial accuracy of 0.05% make the errors resulting from the voltage reference minimal in this application. In addition, there is minimal mismatch between the two outputs and both outputs have excellent tracking across temperature, as shown in Figure 9-4 and Figure 9-5.

REF20 VREF – 2 × VBIAS Distribution (At TA = 25°C)Figure 9-4 VREF – 2 × VBIAS Distribution (At TA = 25°C)
REF20 Distribution of VREF – 2 × VBIAS Drift Tracking Over TemperatureFigure 9-5 Distribution of VREF – 2 × VBIAS Drift Tracking Over Temperature