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UCD9222和UCD7242组合提供6678的CVDD电源中遇到的问题

Other Parts Discussed in Thread: UCD7242

我在低温零下40摄氏度时,使用5V供电,发现5V输入存在向下波动,最低降到3.8V,波动一段时间后,CVDD瞬间不输出,输入电压恢复到5V且不波动,请问下输入端的波动有可能是UCD7242芯片引起的吗?我把供电芯片换为LTM4616输入端5V就没有波动了。