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

7.2.2 120V Bootstrap Amplifier

The THS3470's unique combination of high supply voltage (60V), high output current (1.35A DC, 2A Peak), and fast slew rate (3kV/us) make the device an attractive option for many applications. Despite the already high voltage of the THS3470 amplifier, many applications demand higher voltage requirements with the unique feature set that the THS3470 already provides. Creating a 3-Amplifier "Bootstrap" design allows designers to increase the voltage headroom while mostly preserving the electrical performance and diagnostic features of the THS3470.

Amplifier bootstrapping uses a resistor divider, a doubled supply range, and two additional amplifiers to move the "signal amplifier" supplies dynamically as the output voltage is moving. The amplifier that is connected to the input signal, as shown in Figure 7-6, is known as the "signal amplifier" and provides the output voltage and current to the application. The "supply amplifiers" are connected such that VCC/VEE = 60V/0V for the top supply amplifier which provides the signal amplifiers VCC connection. Conversely, the bottom supply amplifier has a supply voltage of VCC/VEE = 0V/-60V and provides the signals amplifiers VEE connection. By providing multiple supplies in this way, and using the resistor divider, every amplifier can operate within the operating maximum of the THS3470 (60V) and enable a 100VPP output signal.

THS3470 120V Bootstrap Amplifier Example Figure 7-6 120V Bootstrap Amplifier Example