SBOSA39A April   2025  – October 2025 THS3470

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
    5. 5.5 Electrical Characteristics ±VS = ±30V
    6. 5.6 Electrical Characteristics ±VS = ±20V
    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 Output Current Limit
      2. 6.3.2 Output Current Enable
      3. 6.3.3 Over Temperature Flag
      4. 6.3.4 Output Current Flags
      5. 6.3.5 Output Current Monitoring
      6. 6.3.6 Die Temperature Monitoring
      7. 6.3.7 External Compensation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Power Modes
      2. 6.4.2 Choosing a Feedback Resistor
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 High-Voltage, High-Precision, Composite Amplifier
        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 120V Bootstrap Amplifier
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Performance Plots
    3. 7.3 Short Circuit Protection
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Thermal Considerations
        1. 7.5.1.1 Top-Side Cooling Benefits
        2. 7.5.1.2 THS3470 Safe Operating Area
      2. 7.5.2 Layout Guidelines
      3. 7.5.3 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 TAPE AND REEL INFORMATION

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • REB|42
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.4 Output Current Flags

The THS3470 output current flags, ISNK_FLAG and ISRC_FLAG, are used to monitor when the current limits set by ISNK_LIMIT and ISRC_LIMIT and are met or exceeded on the VOUT pin of the device. If the ISNK_LIMIT current sinking limit (current entering the device output) is exceeded, the ISNK_FLAG pin is pulled low to DGND. If the ISNK_LIMIT current sinking limit is not exceeded, the ISNK_FLAG pin is pulled high to the internal VDD voltage of 5V. If the ISRC_LIMIT current sourcing limit (current exiting the device output) are exceeded, the ISNK_FLAG pin is pulled low to DGND. If the ISRC_LIMIT current sourcing limit is not exceeded, the ISNK_FLAG pin is pulled high to the internal VDD voltage of 5V.

Note: The output current flags function the same, regardless of the state of the output current enable flags.

There are two primary use cases for the output current flags. The first use case is to connect the ISNK_FLAG to the ISNK_LIMIT_EN pin to allow the device to self-limit the current into VOUT. The second use case is to connect ISNK_FLAG to a digital input/output pin of a microcontroller and monitor the pin as a current-warning flag. For more information regarding each of these use cases, see also Section 6.3.2.

THS3470 ISNK_FLAG Schematic Figure 6-5 ISNK_FLAG Schematic