Stock Code: 603160

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Audio Amplifier

TFA9891: 9.5V Highly Power-Efficient DSP Embedded Class-D Audio Amplifier


The TFA9891 is a high efficiency Class-D audio amplifier with a sophisticated speaker boost and protection algorithm. It can deliver 7.2 W peak output power into an 8Ohm speaker at a supply voltage of 3.6 V. The internal boost converter raises the supply voltage to 9.5 V, providing ample headroom for major improvements in sound quality.

Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to accurately calculate both the temperature and the excursion, allowing the TFA9891 to adapt to changes in the acoustic environment.


  • Boost Voltage – 9.5 V

  • Output power: 3.6 W (RMS) into 8 Ohm at 3.6 V supply voltage (THD = 1%)

  • I2C-bus control interface (400 kHz)

  • High efficiency and low power dissipation

  • Sample frequencies from 8 kHz to 48 kHz supported in I2S mode and 16 kHz to 48 kHz in PDM mode

  • 3 bit clock/word select ratios supported (32x, 48x, 64x) in I2S mode

  • Bit clock speed from 2.048 MHz up to 6.144 MHz in PDM mode

System Block Diagram

Application Block Diagram






  • TFA9891_SDS_Rev.2.1 DS-VAA-00039-EN Rev.2.1 2020-04-30 PDF

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