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Power switch

Pes
Prodigy 40 points

Hi,

    I' m looking for a power switch which can supply from a first voltage if present (3.3V with USB connected) or from a second voltage (battery) if not.
    The circuit must supply 300mA from the first or the second voltage.
    I would like to have a low quiscent current <1µA if possible.
    
    from a main 300mA from one Voltage 3.3V if USB is present) and 300mA or from another. If the first Voltage (from USB) is present. The switch can integrate or no an LDO function for the first Voltage.
    
    Do you have such a integrated circuit for me?
    
    Thank you