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电源转换选型

Other Parts Discussed in Thread: TPS62120

我现在的项目需要将9v电池供电转换为3.3v输出,电流要尽可能小,最好50mA以下,效率要尽可能的高,以延迟电池使用寿命,请帮忙推荐几个电源芯片,谢谢。