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几点要求：
1、尽量小，单电源
2、无需大电容隔直输出的
3、非CHARGE PUMP方式的，即将耳机地接耳放直流偏压。想对比下这种耳放和CHARGE PUMP方式的电流差多少。
你好，TI的耳放 可以在以下链接找到：
http://focus.ti.com.cn/cn/paramsearch/docs/parametricsearch.tsp?familyId=925§ionId=630&tabId=2701&family=analog&uiTemplateId=AUDIO_PRDSRCH_T&familyAliasId=1100925
推荐 TPA6120A2。
