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BQ24133: BQ24133 Boost / Buck operation

Part Number: BQ24133
Other Parts Discussed in Thread: BQ25886

I am designing a battery charger / pack using the BQ24133.  The battery consists of two (2) 3.7V Li-Poly cells in series for a total pack voltage of 8.4V.  The datasheet for the BQ24133 states that the minimum input voltage is  4.5V.  My question is; Does the BQ24133 provide both buck and boost functions, i.e. the input voltage is less than the battery pack voltage?  If so, I would need to use a 9.0V source voltage vs. the 5.0V that I had intended to use.