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HT8699 integrates a boost converter with a filter-less stereo class D audio power amplifier to provide 2×5.5W continuous power into a 4Ω speaker when operating from a Li-battery voltage boosted to 7V. Meanwhile, the boost output voltage is adjustable.Class AB amplifier mode is also available for HT8699. Once the EMI Interference from class D and Boost Converter becomes an annoying problem, HT8699 can be switched into Class AB mode.HT8699 has a filter-less modulation circuit which directly drives speakers while realizes low distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications.HT8699 has the independent Shutdown function which can minimize the power consumption at standby and MUTE function. As for protection function, over current protection, over temperature protection function, and low supply voltage malfunction preventing function are also prepared.