SBOSA42B June   2024  – December 2025 OPA2596

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information OPA596
    5. 5.5 Thermal Information OPA596
    6. 5.6 Electrical Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 MUX-Friendly Inputs
      2. 6.3.2 Thermal Protection
      3. 6.3.3 Advanced Slew Boost
      4. 6.3.4 Overload Recovery
      5. 6.3.5 Full-Power Bandwidth Improved
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Bridge-Connected Piezoelectric Driver
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 DAC Output Gain and Buffer
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
      3. 7.2.3 Single-Supply Piezoelectric Driver
      4. 7.2.4 High-Side Current Sense
      5. 7.2.5 High-Voltage Instrumentation Amplifier
      6. 7.2.6 Composite Amplifier
    3. 7.3 Creepage and Clearance
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
        1. 7.5.1.1 Thermal Considerations
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.5.1.1 Thermal Considerations

Through normal operation, the op amps can self-heat. Self-heating is a natural increase in the die junction temperature that occurs in every amplifier. This self-heating is a result of several factors, including quiescent power consumption, package thermal resistance, PCB layout, and device operating conditions.

Operate the OPAx596 within the rated junction temperature, TJ, range to avoid thermal shutdown. Use the Equation 3 to determine the estimated TJ

Equation 3. T J = P D   ×   R θ J A + T A

In a quiescent state, PD is given by the product of the power supply and the quiescent current of the op amp. Equation 4 shows the calculation of TJ for the OPAx596 assuming an 85V power supply is used and an operating temperature of 25°C.

Equation 4. T J = 85 V   × 490 μ A × 165.4 ° C W + 25 ° C
Equation 5. T J = 31.89 ° C

The low power consumption of the OPAx596 causes minimal self-heating even in a small SOT23-5 package as given by Equation 5. In a loaded condition, PD is equal to addition of the quiescent power, PDQ and the power dissipated by the output stage, PDL. The worst-case condition is given when the output voltage is equal to ½ of either supply rail (assuming symmetrical supplies, V+ and V-). In a worst-case condition, PDL is given by Equation 6.

Equation 6. P D L = ( V + ) 2 4 × R L

For example, assume the OPAx596 is powered with bipolar ±42.5V power supplies and drives a 5kΩ load, RL, to ground. The maximum increase in TJ is expected to be about 22°C as given by Equation 7. In this example, to keep the op amp within the Absolute Maximum Ratings, operate in TA well under 128°C to account for different factors. The calculation for a 5kΩ load is depicted visually in Figure 7-9.

Equation 7. ∆ T J = 41.7 m W + 90.3 m W × 165.4 ° C W

For high-voltage amplifiers such as the OPAx596, the junction temperature can easily be tens of degrees higher than the ambient temperature in a quiescent (unloaded) condition. As shown by Equation 3, the junction temperature depends on the thermal properties of the package, as expressed by the junction-to-ambient thermal resistance (RϴJA). If the device then begins to drive a heavy load, the junction temperature can rise and trip the thermal-shutdown circuit. Figure 7-9 shows the maximum output voltage versus ambient temperature to avoid exceeding the Absolute Maximum Ratings in both loaded and unloaded conditions for the SOT23-5 package version of the OPA596. The curve assumes a typical quiescent current and does not account for any temperature variation of quiescent current.

OPA2596 OPA596 (SOT23-5) Thermal Safe Operating AreaFigure 7-9 OPA596 (SOT23-5) Thermal Safe Operating Area
OPA2596 OPA2596 (VSSOP-8) Thermal Safe Operating AreaFigure 7-10 OPA2596 (VSSOP-8) Thermal Safe Operating Area