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LM2735升压电路出现故障,无故烧芯片...

Other Parts Discussed in Thread: LM2735, TPS61169

LM2735Y把3.7V的电池电压升压到5V使用,在没有接负载的情况下,一上电LM2735就发烫,输出电压没有变化,反馈脚的电压是0.9V左右,断电之后测量发现SW对地电阻变为1K或者为0

已经烧了十几片了,完全是按照手册上的接法来的,检查过各个脚的电压都是正常的,但是一接上芯片就烧,不知道是什么原因。