SLOSEG2 April   2026 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 
    5. 6.5 Electrical Characteristics
    6. 6.6 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

8.3.5 Capacitive Load and Stability

The OPA620 can drive a wide range of capacitive loads. However, all op amps may become unstable under certain conditions. Key factors affecting stability include op amp configuration, gain, and load value. Unity-gain configuration makes op amps most susceptible to capacitive loading effects. The capacitive load interacts with the device output resistance and any additional load resistance, creating a pole in the small-signal response that reduces phase margin. See also the Frequency Response vs Capacitive Load typical characteristic curve (Frequency Response for Various CL Values).

The OPA620 topology enhances the ability to drive capacitive loads. In unity gain, these op amps perform well with large capacitive loads. See also the Figure 6-14 typical characteristic curves.

Figure 8-1 shows one method of improving capacitive load drive in the unity-gain configuration is to insert a 10Ω to 20Ω resistor in series with the output. This configuration significantly reduces ringing with large capacitive loads; see the Frequency Response for Various CL Values typical characteristic curve. However, if there is a resistive load in parallel with the capacitive load, RS creates a voltage divider. This voltage division introduces a DC error at the output and slightly reduces output swing. This error can be insignificant. For instance, with RL = 10kΩ and RS = 20Ω, there is an error of approximately 0.2% at the output.

OPA620 Series Resistor in Unity- Gain Configuration Improves Capacitive Load Drive Figure 8-1 Series Resistor in Unity- Gain Configuration Improves Capacitive Load Drive