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This paper presents a high power efficient class-D audio power amplifier. The proposed class-D amplifier adopts the synchronized controlled oscillation modulator (SCOM), which is suitable for mobile applications. The THD+N at half the maximum output power is below 0.01% and the efficiency is better than 92% in an 8 Ω speaker load. The one-chip integrated circuit is implemented in a 0.35 μm CMOS technology, with a supply voltage range of 1.6 V-3.6 V. it occupies a chip area of 1.2×1.2 mm2 and dissipates only 1.3 mA at idle.