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TPS61030 负载小的时候正常 负载大的时候芯片就烧了

Other Parts Discussed in Thread: TPS61030

锂电池系统,3.0V升压至4V,给GPRS模块供电;用的芯片是TPS61030  负载小的时候正常  负载大的时候芯片就烧了(GPRS模块工作的时候)  现象是SW脚短路;电感用 SWPA6020S6R8NT,换电流的电感结果也一样;原理图,PCB见附件;