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芯片上写着 25TI AXL,好像是个LDO,但TI的网站上找不到，TSSOP-8封装
AXL表面打印的芯片为TPS79401，楼主可以再确认一下。
另外，表面打印信息查询的地址如下
http://www.ti.com/general/docs/partmarking/partmarkinglookup.tsp?startPosition=0&navigationId=10649&templateId=1&siteFlag=7&keyword=OBCQ%2b&searchType=partmark
