SLOSEG2A April   2026  – June 2026 OPA2620 , OPA620

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 OPA620
    5. 6.5 Thermal Information OPA2620
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Operating Voltage
      2. 8.3.2 Rail-to- Rail Input
      3. 8.3.3 Rail-to- Rail Output
      4. 8.3.4 Output Drive
      5. 8.3.5 Capacitive Load and Stability
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Low-Side Current Sensing
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
      2. 9.2.2 CPU/GPU Supply Voltage Monitoring
        1. 9.2.2.1 Detailed Design Procedure
      3. 9.2.3 Driving Analog-to-Digital Converters
        1. 9.2.3.1 Detailed Design Procedure
      4. 9.2.4 Wide-Band Transimpedance Amplifier
        1. 9.2.4.1 Detailed Design Procedure
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 Power Dissipation
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
    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

9.2.1.2 Detailed Design Procedure

RSense is chosen in the range of milli ohms for lower power dissipation and high gain due to precision characteristic of OPAx620. The op-amp's low offset voltage and rail to rail output are able to significantly impact measurement accuracy, especially when the shunt voltage is small or the sensed current is low. A larger output voltage swing post calibration allows a larger gain and smaller RSense for improved accuracy and lower power dissipation.

The output voltage is given by,

Equation 1. VOUT = G × ISense × RSense,   where G = R2R1 = 100V/V
Equation 2. Output offset, VOSOUT = VOSIN× G = ±1mV × 100 = ±0.1mV
Equation 3. Max Output Swing, VOPP = VMAXOUT- 2 ×VOSOUT ,where VMAXOUT is maximum voltage swing at the output
Equation 4. VOPP = (3.3- 0.2)- 2 ×0.1mV =2.9V 

Hence, having precision amplifier gives a larger usable output swing. This setup is a great choice for electric vehicle systems like traction inverters, onboard chargers, and DC/DC converters, where minor current changes and responding to current faults in < 1μs is essential for protecting SiC/GaN-based power stages.