SBOS557E August   2011  – April 2018 OPA170 , OPA2170 , OPA4170

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Smallest Packaging for 36-V Operational Amplifiers
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions: OPA170
    2.     Pin Functions: OPA2170
    3.     Pin Functions: OPA4170
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information: OPA170
    5. 7.5 Thermal Information: OPA2170
    6. 7.6 Thermal Information: OPA4170
    7. 7.7 Electrical Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Operating Characteristics
      2. 8.3.2 Phase-Reversal Protection
      3. 8.3.3 Electrical Overstress
      4. 8.3.4 Capacitive Load and Stability
    4. 8.4 Device Functional Modes
      1. 8.4.1 Common-Mode Voltage Range
      2. 8.4.2 Overload Recovery
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Unity-Gain Buffer
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 TINA-TI™ (Free Software Download)
        2. 12.1.2.2 DIP Adapter EVM
        3. 12.1.2.3 Universal Operational Amplifier EVM
        4. 12.1.2.4 TI Precision Designs
        5. 12.1.2.5 WEBENCH Filter Designer
        6. 12.1.2.6 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Community Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.4 Capacitive Load and Stability

The dynamic characteristics of the OPAx170 have been optimized for common operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for example, ROUT equal to 50 Ω) in series with the output. Refer to Figure 39 and Figure 40 illustrate graphs of small-signal overshoot versus capacitive load for several values of ROUT. Also, refer to applications bulletin AB-028, Feedback Plots Define Op Amp AC Performance, for details of analysis techniques and application circuits.

OPA170 OPA2170 OPA4170 G023_BOS557.gif
100-mV Output Step G = 1
Figure 39. Small-Signal Overshoot vs Capacitive Load
OPA170 OPA2170 OPA4170 G024_BOS557.gif
100-mV Output Step G = –1
Figure 40. Small-Signal Overshoot vs Capacitive Load