5.3 A 2×70W monolithic five-level Class-D audio power amplifier

The consumer electronics trends of miniaturization and portability have been pushing the integrated Class-D audio power amplifier (PA) market for a number of years. This creates opportunities for new players in the market, through reduction of output LC filter size and reduction of power losses. In battery-powered applications, near-idle power loss is of particular interest, since the audio PA will typically run almost idle.