Audio IC

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MA12040 Class-D Audio Amplifier is a filterless and super-efficient audio power amplifier based on proprietary multi-level switching technology. The device supports a wide supply voltage range, allowing it to be used in many different applications. Multi-level switching enables very low power loss during operation. In addition, it allows the amplifier to be used in filterless configurations at full rated power in a wide range of audio products.

The MERUS™ MA12040 features an embedded digital power management scheme. The power management algorithm dynamically adjusts switching frequency and modulation to optimize power loss and EMI across the output power range. A 4th order feedback loop ensures low distortion and a high PSRR. The MERUS™ MA12040 operates from a single power stage supply voltage (PVDD) and a 5V system supply voltage (DVDD, AVDD). Highly flexible output stage configurations are offered, ranging from four single-ended outputs to a single parallel-BTL output.

The MERUS™ MA12040 features protection against DC, short-circuits, over-temperature, and under-voltage situations. Flexible “Power Mode Profiles” allow the user to utilize the multi-level switching technique for very low power loss or very high audio performance. Device configuration is controlled through an I2C interface as well as dedicated control pins.


  • Proprietary Multi-level Switching Technology
    • 3-level and 5-level modulation
      • Low EMI emission
      • Filterless amplification
    • Digital Power Management Algorithm
  • High Power Efficiency (PMP4)
    • >79% Efficiency at 1W power (1kHz sine, 8Ω)
    • >92% Efficiency at Full Power (1kHz sine, 8Ω)
  • Audio Performance (PMP2)
    • >107dB DNR (A-w, rel. to 1% THD+N power level)
    • 55µV output integrated noise (A-w)
    • 0.003% THD+N at high output levels
  • 4th Order Feedback Error Control
    • High suppression of supply disturbance
    • HD audio quality
  • Supply Voltages: +4V to +18V (PVDD) and +5V (A/DVDD)
  • Selectable Gain (20dB/26dB)
  • 2×40W peak output power (18V PVDD, RL = 4Ω, 10% THD+N level)
  • 2×20W continuous output power (RL = 8Ω at 18V, PMP4, 10% THD+N level, without heatsink)
  • 2.0, 2.1, 4.0, 1.0 Output Stage Configurations
  • Protection
    • Under-voltage-lockout
    • Over-temperature warning/error
    • Short-circuit/overload protection
    • Power stage pin-to-pin short-circuit
    • Error-reporting through a serial interface (I2C)
    • DC protection
  • I2C control (four selectable addresses)
  • Heatsink free operation with EPAD-down package


  • Battery Operated Speakers
  • Wireless and Docking Speakers
  • Soundbars
  • Multi-room Systems
  • Home Theater Systems