3W High Efficiency Mono Class-D Audio Amplifier

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The MP1740 is a high efficiency Class-D H-bridge audio amplifier. It utilizes a full bridge output structure capable of delivering 3W into 4O speaker. The device exhibits the high fidelity of a class AB amplifier with an efficiency of 91%. It also dramatically reduces solution size by integrating the following: 300mΩ (high side or low side) power MOSFETs (VCC=3.6V), Startup / Shutdown pop elimination, Short circuit protection, 9 Balls Wafer chip scale package (WLCSP) and requires a few external components. This amplifier also improves GSM power supply rejection, and operates on a single cellular Li-ion battery. The gain of this amplifier can be controlled easily by a few modification of external configuration while minimizing noise to 37 μVRMS.


  • 3W Into 4Ω with 5 V Supply @ 10% THD+N
  • Efficiency up to 90% at 1.7W Pout, 8 ohm load
  • 2.5V to 5.5V Supply Voltage Operation
  • THD+N = 0.1% @ 1.8W, 5V, 4Ω
  • 2mA Quiescent current and 0.5μA shutdown current
  • Full Bridge Output Drive
  • Internal 250kHZ Switching frequency
  • Fully Differential input
  • Improved CMRR Eliminates Two Input Coupling Capacitors
  • 1ms start-up time Eliminates pop
  • Integrated Short Circuit Protection
  • Integrated Thermal Shutdown
  • 9 Balls Wafer chip scale package (WLCSP)


  • PackageWLCSP-9
  • GradeCatalog
  • TypeMono BTL
  • Total Pout (max) (W)3
  • PSRR (dB)-62
  • THD+N (%) @1W0.1
  • Efficiency (%)90
  • Vin (max) (V)5.5
  • Vin (min) (V)2.5




The EV1740EC-00A is the evaluation board for the MP1740, a low-power mono BTL class-D audio amplifier. It is one of MPS’s products in a very small WLCSP package, high efficiency, and full bridge output structure capable of delivering 3W into 4Ω speaker.

The gain of this module is set at 2V/V, and can be easily programmed by changing the input resistors.

US$ 50.00 + tax