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TPS65000请教,急~~~~~~~~~~~~~~~~

Other Parts Discussed in Thread: TPS65000

电路设计图如下:

现在情况是锂电池输入4.2V,正常输入电流是50mA左右,这两天调试整机时连续碰到:整机各功能模块都正常,但是输入电流变大到130mA左右,导致锂电池工作时间变短。测量发现芯片5脚(SW)对地电阻只有30欧姆左右,更换TPS65000,一切正常,请问,这我需要从哪方面去分析找问题?可能是什么原因导致芯片产生了问题了?