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TPS61222,3.7V锂电池输入,输出却是3.4V,理论上应该是5V

如上图的电路图,我是参考芯片手册,但是当接上单节 14500型锂电池,锂电池实测电压为3.787V,输出2,4脚理应为5V,但测得确是3.359V,不知道如何解决