ISL81601 UPS with low voltage battery/capacitor

Hello!

I would like build a UPS with only 1 cell of Li-Ion battery (max. 4.2V) or supercapacitor (max. 2.7V). System bus would be 5V.

According to the datasheet the minimum voltage on Vin should be minimum 4.5V, so I can't use the Vin side of the dcdc converter for the battery, as discribed in "Design Considerations for a Bidirectional DC/DC Converter" white paper. 

Is it possible to  swap the sides, and use the Vout side of the controller for the battery (min. 0.8V is low enough), and Vin for the system bus?

Thanks for help in advance.

Br,

Zoltan

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