SLOS941B May 2016  – June 2017 TPA3128D2 , TPA3129D2


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5DC Electrical Characteristics
    6. 6.6AC Electrical Characteristics
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 Gain Setting and Master and Slave
      2. 7.3.2 Input Impedance
      3. 7.3.3 Startup and Shutdown Operation
      4. 7.3.4 PLIMIT Operation
      5. 7.3.5 GVDD Supply
      6. 7.3.6 BSPx AND BSNx Capacitors
      7. 7.3.7 Differential Inputs
      8. 7.3.8 Device Protection System
      9. 7.3.9 DC Detect Protection
      10. 7.3.10Short-Circuit Protection and Automatic Recovery Feature
      11. 7.3.11Thermal Protection
      12. 7.3.12Device Modulation Scheme
      13. 7.3.13Efficiency: LC Filter Required with the Traditional Class-D Modulation Scheme
      14. 7.3.14Ferrite Bead Filter Considerations
      15. 7.3.15When to Use an Output Filter for EMI Suppression
      16. 7.3.16AM Avoidance EMI Reduction
    4. 7.4Device Functional Modes
      1. 7.4.1PBTL Mode
      2. 7.4.2Mono Mode (Single Channel Mode)
  8. Applications and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requriements
      2. 8.2.2Detailed Design Procedure
        1. the PWM Frequency
        2. the Amplifier Gain and Master/Slave Mode
        3. Input Capacitance
        4. Decoupling Capacitors
        5. Bootstrap Capacitors
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
    1. 9.1Power Supply Mode
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information


  • Supports Multiple Output Configurations
    • 2 × 30 W Into a 8-Ω BTL Load at 24 V (TPA3128D2)
    • 2 × 15 W Into a 8-Ω BTL Load at 15 V (TPA3129D2)
  • Wide Voltage Range: 4.5 V to 26 V
  • Efficient Class-D Operation
    • Very Low Idle Current: <23 mA for recommended LC filter configurations
    • Greater than 90% Power Efficiency Combined With Low Idle Loss Greatly Eliminates Need for Heat Sink
    • Adaptive Modulation Schemes based on Output Power
    • Smart Amplifier Drivers to Reduce the Requirement for RC Snubbers
  • Multiple Switching Frequencies
    • AM Avoidance
    • Master and Slave Synchronization
    • 300-KHz to 1.2-MHz Switching Frequency
  • Feedback Power-Stage Architecture With High PSRR Reduces PSU Requirements
  • Programmable Power Limit
  • Parallel BTL Mode and Mono-Channel Mode Support
  • Supports Both Single and Dual Power Supply Modes
  • Integrated Self-Protection Circuits Including Overvoltage, Undervoltage, Overtemperature, DC-Detect, and Short Circuit With Error Reporting
  • Thermally Enhanced Packages
    • DAP (32-Pin HTSSOP Pad Down for TPA3128D2 and TPA3129D2)


  • Bluetooth/Wireless Speakers
  • Soundbars
  • Mini-Micro Component, Docks
  • Home Theaters


The TPA3128D2 and TPA3129D2 have low idle power loss and helps to extend the battery life of Bluetooth/Wireless speakers and other battery-powered audio systems. The high efficiency of the TPA3128D2 device allows it to do 2 × 30 W without external heat sink on a dual layer PCB. The high efficiency of the TPA3129D2 device allows it to do 2 × 15 W without external heat sink on a dual layer PCB. This device proposed an efficiency boost Mode, which can dynamically reduced the current ripple of the external LC filter and the idle current .

The TPA31xxD2 advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences, which is achieved together with an option of either master or slave option, making it possible to synchronize multiple devices.

The TPA31xxD2 devices are fully protected against faults with short-circuit protection and thermal protection as well as overvoltage, undervoltage, and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.

Device Information(1)

TPA3128D2DAP (32)11.00 mm × 6.20 mm
TPA3129D2DAP (32)11.00 mm × 6.20 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Application Circuit

TPA3128D2 TPA3129D2 APP_CIR_SLOS941.gif