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TMS320F280045: LDO usage

Part Number: TMS320F280045
Other Parts Discussed in Thread: C2000WARE

Dear Sirs

I'm using the TMS320F280045RSHSR (VQFN 56 package) in a new design.  The design will have two SPI peripherals and six GPIO.  Although the hardware loading of the uC will be low, there will be considerable CPU loading due to mathematical calculations.  This package does not have the VREGENZ pin.  On page 64, it states "The smaller pin-count packages may not include the VREGENZ pin; therefore, the internal VREG is always enabled and, as such, is the required supply source for the VDD pins.".  Does this mean that the internal DC-DC regulator can not be used?  If so, what sort of heat dissipation should I expect, given that the LDO efficiency is only 20%?  Thank you.