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DCDC升压芯片SN61838SZ工作不正常,输出电压5.88V

麻烦各位帮忙看下SN61838SZ升压问题。SN61838SZ的电路完全是按照规格书推荐的电路连接的,可是输出电压是5.88V,已经超出了芯片最大的输出电压5.5V。拆掉一些外围元件也没有任何改变,开关频率也不正常(乱七八糟的波形),好像电路没有在工作,但就是有5.88V输出。各位帮忙看下会是什么问题。谢谢!