2.7W Mono Class D Low-EMI High-Efficiency Audio Amplifier



The MP1720 is a high efficiency Class-D audio amplifier. It utilizes a full bridge output structure capable of delivering 2.7W into 4Ω speaker. This device exhibits the high fidelity of a class AB amplifier with an efficiency of 90% which dramatically reduces solution size by integrating the following:

l  250mΩ power MOSFETs (VIN =3.3V)

l  Startup / Shutdown pop elimination

l  Short circuit /Thermal overload Protection

The MP1720 features a pin-selectable 1MHz or 1.3MHz frequency control or can be synchronized to an external clock source. The flexible switching frequency and internal EMI-reduction scheme eliminates the need for an   output LC filter and passes emission standards without filter & with considerable cable.

The MP1720 has five fixed gain options. MP1720-3: 3dB; MP1720-6: 6dB; MP1720-9: 9dB; MP1720-12: 12dB; MP1720-216: 21.6dB.

The MP1720 is available in 10-pin MSOP-EP and 10-pin QFN packages.


  • Passes FCC-Radiated Emissions Standards with 24inch of Cable without output filter
  • 2.7W Into 4Ω with 5V VIN @ 10% THD+N
  • Up to 90% Efficiency
  • Flexible Switching Frequency setting
  • Low Noise (53μV Typical) with 3.3V VIN
  • 15ms Start-up time Eliminates pop
  • Low Quiescent Current (4mA @3.3V)
  • Low Shutdown Current (0.1μA)
  • Full Bridge Output Drive
  • Fully Differential Input
  • Short circuit Protection
  • Thermal Shutdown


  • PackageMSOP-10, QFN-10 (3x3)
  • GradeCatalog
  • TypeMono BTL
  • Total Pout (max) (W)2.7
  • PSRR (dB)-60
  • THD+N (%) @1W0.13
  • Efficiency (%)90
  • Vin (max) (V)5.5
  • Vin (min) (V)2.5