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OMAPL138/AM1808的电源问题

Other Parts Discussed in Thread: TPS65070, LM1117

CPU的1.8V电源通过TPS65070的LDO1提供,系统启动后,电源芯片发热严重。在3.3v电路中串联5.2欧姆电阻测得电流是100多mA(还有为其它电路供电),1.8V电路中串联进这个电阻后,在CPU管脚一端的电压竟然达到了2.2V左右。好像是电压从CPU出来的一样,好几个板子都是这样,求解!!