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TPS63020: TEC Driver per App Note PMP9759

Part Number: TPS63020
Other Parts Discussed in Thread: PMP9759

When using the TPS63020 as a TEC driver, and configured per the app note PMP9759, does the power supply that is feeding the TPS63020 input need to be able to sink current?  When the TEC is being driven such that the TPS63020 output is in boost mode, does the reverse current from TEC flow back into the TPS63020 input?  Or will the current try to flow into the power supply that's feeding it?  The app note seems to imply the reverse current will sink back into the TPS63020 but I wanted confirmation.  I wanted to make sure that the feeding power supply did not need to be able to sink current as well.