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TPS2121电源切换问题

Other Parts Discussed in Thread: TPS2121, TPS2113

想用TPS2121去做电源切换,1路是DCDC供电(适配器提供),另外1路是电池供电,插入适配器时优先切换到DCDC供电,拔掉适配器时切换到电池供电,目前遇到的问题是拔掉适配器时,输出电压会瞬间跌落到2.9V,导致主芯片不能正常工作,会重启启动系统,但是电池切换到DCDC就不会,请问有办法解决这个切换掉电的问题吗?在输出端加大电容也不能解决,电路如图:还有个问题时,带载2.5A负载时,输入跟输出有0.22V的压差,规格书上内阻是56m欧,理论计算压差是0.112V