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推荐一款电源切换芯片

Other Parts Discussed in Thread: TPS2121

dear TI工程师

电源切换芯片要求:输入电压支持2.5-6V(输入源2个,1个是DC输入=4.3V,另外1个锂电池输入:3.4-4.3V),电流>4A,内阻<40m欧,静态电流要小于200uA,要求带载3A的时候切换能做到不掉电,有优先选择输入的管脚,插入DC优先选择DC供电,没有DC的时候才是锂电池供电,之前用过TPS2121效果不是很好,切换的时候会掉电,或者有没有充电芯片是支持不带电池的时候,VSYS输出也是很稳定的?