SBOS659B January   2022  – August 2022 OPA593


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Current Limit
      2. 7.3.2 Overcurrent Flag
      3. 7.3.3 Overtemperature Flag
      4. 7.3.4 Output Enable and Disable
      5. 7.3.5 Mux-Friendly Inputs
    4. 7.4 Device Functional Modes
  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 Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. PSpice® for TI
        2. TINA-TI™ Simulation Software (Free Download)
    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
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

Output Enable and Disable

The OPA593 incorporates an enable and disable feature that uses the E/D pin to disable the output stage of the amplifier, which lowers the power consumption of the op amp and switches the output to a high-impedance state.

The E/D pin is referenced to the E/D Com pin. If left floating, the E/D pin is internally pulled up to enable the device. If externally controlled, the E/D pin must be supplied with a voltage between 2.5 V and 5 V greater than the E/D Com pin voltage. Even though the OPA593 output is enabled with a floating E/D pin, a moderately fast, negative-going signal capacitively coupled to the E/D pin can overpower the internal pullup and cause device shutdown. If the enable function is not used, a conservative and recommended approach is to connect E/D through a 30-pF capacitor to a low-impedance source. Another alternative is to connect an external current source from V+ (positive supply) that is sufficient to hold the enable level greater than the shutdown threshold. Figure 7-3 shows a circuit that connects E/D and E/D Com.

Figure 7-3 E/D and E/D Com

When the E/D pin is dropped to a voltage between 0 V and 0.65 V greater than the E/D Com pin voltage, the output of the OPA593 is disabled. Because the inputs are still active, an input signal can be passed to the output of the amplifier, despite being in a high-output-impedance state. The voltage at the amplifier output is reduced because of a drop across this output impedance, and can appear distorted compared to a normal operation output.