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BQ27441-G1: pls help recommend a power solution..

Part Number: BQ27441-G1

we are designing a system with an battery and dc power supply, the dc-power in is 5V, battery is one cell need charge.  the power rail on board is 3.3v@850mA,  5v@2A, 1.8V@50mA;

if DC-IN exist, the power should come from DC-IN, after remove DC-IN, the power is from battery. could you help recommend a solution?