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Hi ZhiDong:
按照TPS76325 官网的Marking 介绍: www.ti.com.cn/.../topsidemarking.tsp
芯片上标示应该是芯片名称,请确认?
(TPS76325亦然)
datasheet中都会标注出来,例如TPS76325 datasheet 第一页:

对于未知芯片的Marking Code查询,我的经验是Marking Code(前提是你要看对了,不要把PBBI看成PBB1)+封装名称+google,供参考。
http://focus.ti.com/general/docs/partmarking/partmarkinghome.jsp
http://welltechcom.taobao.com 主营TI ADI产品,支持工程师的小批量研发采购,从样品做起,汇您所需