SBVS299A April   2017  – September 2025 REF31-Q1

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 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Supply Voltage
      2. 7.3.2 Thermal Hysteresis
      3. 7.3.3 Temperature Drift
      4. 7.3.4 Noise Performance
      5. 7.3.5 Long-Term Stability
      6. 7.3.6 Load Regulation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Negative Reference Voltage
      2. 7.4.2 Data Acquisition
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

6.6 Typical Characteristics

At TA = 25°C, VIN = 5-V power supply, and REF3125-Q1 is used for typical characteristic measurements, unless otherwise noted.

REF31-Q1 Temperature Drift
0°C to 70°C
Figure 6-1 Temperature Drift
REF31-Q1 Output Voltage vs TemperatureFigure 6-3 Output Voltage vs Temperature
REF31-Q1 Quiescent Current vs TemperatureFigure 6-5 Quiescent Current vs Temperature
REF31-Q1 PSRR vs FrequencyFigure 6-7 PSRR vs Frequency
REF31-Q1 Output Voltage vs Load Current
Figure 6-9 Output Voltage vs Load Current
REF31-Q1 0.1-Hz to 10-Hz NoiseFigure 6-11 0.1-Hz to 10-Hz Noise
REF31-Q1 Line Transient
CL = 0 pF
Figure 6-13 Line Transient
REF31-Q1 Load Transient
CL = 0 pF±10-mA Output Pulse
Figure 6-15 Load Transient
REF31-Q1 Load Transient
CL = 0 pF±1-mA Output Pulse
Figure 6-17 Load Transient
REF31-Q1 REF3125-Q1 Start-Up
Figure 6-19 REF3125-Q1 Start-Up
REF31-Q1 Temperature Drift
–40°C to +125°C
Figure 6-2 Temperature Drift
REF31-Q1 Dropout Voltage vs Load CurrentFigure 6-4 Dropout Voltage vs Load Current
REF31-Q1 Output Impedance vs FrequencyFigure 6-6 Output Impedance vs Frequency
REF31-Q1 Output vs SupplyFigure 6-8 Output vs Supply
REF31-Q1 Step Response
CL = 0 μF5-V Start-Up
Figure 6-10 Step Response
REF31-Q1 REF3112 Long-Term StabilityFigure 6-12 REF3112 Long-Term Stability
REF31-Q1 Line Transient
CL = 10 μF
Figure 6-14 Line Transient
REF31-Q1 Load Transient
CL = 1 µF±10-mA Output Pulse
Figure 6-16 Load Transient
REF31-Q1 Load Transient
CL = 1 µF±1-mA Output Pulse
Figure 6-18 Load Transient