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可考虑TPA2013D1这款,内部集成了boost converter正如datasheet中描述This provides a louder audio output than a stand-alone amplifier connected directly to the battery. It also maintains a consistent loudness, regardless of battery voltage. 满足您的需求
http://www.ti.com/product/TPA2013D1?keyMatch=TPA2013&tisearch=Search-EN-Everything