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TPS65217C VBAT的问题

Other Parts Discussed in Thread: AM3358

各位TI的工程师:

      你们好,am3358 + tps65217c的板子,和bbblack是一样的电路,AC 端5v输入,sys端5V输出正常,LDO和DCDC的输出电压也都正常,但是BAT端的输出却只有0.8V,请问是什么原因?

另外:tps65217c是否即使有5V的输入,DCDC和LDO输出端不接负载的话也无电压输出呢?因为我的同一个tps65217c的板子,接其中一个负载时,DCDC和LDO端输出的电压都正常,但接另一块板子时(板子电路和前一块相同),DCDC和LDO输出端就没有电压输出。