Please review the schematic and resistor settings for TPS2121 and provide the feedback. The resistor calculation also attached below.
Both inputs are 20V, Input1 is DOCK station and Input2 is from VBUS (USBC). The default power path is DOCK if the dock voltage reaches less than 17.5V the output switch to Input2 which is VBUS from USBC. We are using automatic switchover mode. The current through the mux will be 2.25A continuous in both input cases (ours is 45W system).
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Let me know if you need more info to review the design.
Thanks
Mani