TPA3156D2 - 2x70-W, 4.5V-26V, Analog Input, Class-D Amplifier With Low Idle Power Dissipation

TPA3156D2 - 2x70-W, 4.5V-26V, Analog Input, Class-D Amplifier With Low Idle Power Dissipation - TPA3156D2

Recommended alternative parts

  • TPA3221  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   For higher output power and up to 100-W stereo or 200-W mono, see the TPA3221 Class-D amplifier.


The TPA3156D2 has 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 TPA3156D2 device allows it to do 2 × 70 W with external heat sink on a dual layer PCB. This device integrates an efficiency boost mode, which dynamically reduces the current ripple of the external LC filter and the idle current .

The TPA3156D2 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 TPA3156D2 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.


  • 2 × 70 W Into a 4-Ω BTL Load at 24 V
  • 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
    • Adaptive Modulation Schemes based on Output Power
  • 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
    • DAD (32-Pin HTSSOP Pad Up)
  • Pin to Pin Compatible with TPA3116D2 and TPA3126D2

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Parametrics Compare all products in Speaker Amps

Audio Input Type
Speaker Channels (Max)
Power Stage Supply (Min) (V)
Power Stage Supply (Max) (V)
Output Power (W)
Load (Min) (ohms)
SNR (dB)
THD + N @ 1 kHz (%)
Iq (Typ) (mA)
Control Interface
Closed/Open Loop
Analog Supply (V) (Min)
Analog Supply (V) (Max)
Power to Parallel Bridge Tied Load (Max) (W)
Operating Temperature Range (C)
TPA3156D2 TPA3116D2 TPA3126D2 TPA3128D2 TPA3136D2
Analog Input    Analog Input    Analog Input    Analog Input    Analog Input   
Class-D    Class-D    Class-D    Class-D    Class-D   
Stereo    Stereo    Stereo    Stereo    Stereo   
4.5    4.5    4.5    4.5    4.5   
26    26    26    26    14.4   
70    50    50    30    10   
2    4    4    2    4   
102    102    102    102    102   
0.1    0.1    0.02    0.1    0.04   
17    20    23    17    35   
Hardware    Hardware    Hardware    Hardware    Hardware   
Closed    Closed    Closed    Closed    Closed   
4.5    4.5    4.5    4.5    4.5   
26    26    26    26    14.4   
100    100    100    60    20   
70    70    70    70    80   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85