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请教LDO效率问题

Other Parts Discussed in Thread: TPS62125

锂电池6v-8.4v想转成3.3v 使用LDO好还是DCDC好呢?希望纹波越小越好。

但是担心LDO效率不高而且发热。

有什么好办法吗?LDO的前面加几个二极管怎么样?