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CC2541使用小型锂电池供电问题

Other Parts Discussed in Thread: CC2541, TPS62730, TPS62740

请问如何通过锂电池(3V-4.2V)给CC2541(input: 2-3.6V)供电?选哪个型号的LDO(或者DC-DC?)能兼顾功耗小和PCB面积小(功耗最重要)?还要不要用TPS62730(输入1.9-3.9V,输出2.1V,只在BLE发送、接收数据时开启)?