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TPS23861PW PSE芯片很容易烧坏

小批量了200PCS,目前发现有100多PCS会在重启或者开机的时候烧坏TPS23861PW芯片,都是3.3V短路导致。3.3V我们尝试用LDO和DC/DC供电都会导致TPS23861PW烧坏,拆掉3.3V外围电路,连接48V和3.3V,反复断电开机十几次也会烧坏。我们现在的上电顺序:48V先上电,2S后3.3V上电,然后200mS再复位。用示波器测量3.3V的电压平稳无尖峰,请教下还有什么原因会导致3.3V烧芯片。