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求助电源管理芯片选型,成本敏感.

DeDeBug
Intellectual 930 points
Other Parts Discussed in Thread: TPS61240

系统是这样的,从USB接口供电,保险丝限流是200/400mA,输出稳定的5V/3.3V/1.8V/2.5V,其中USB接口未必足够5V,1.8V为内核电压,允许范围1.75 - 1.85V,电源还会带一个0805红色LED灯,470欧的限流电阻,实际系统负载在200mA以下.有单片解决方案,还是怎样组合,成本敏感.