Enrique,
The DC/DC is usedto reduce the current from the battery in active mode thereby increasing the lifetime of the battery.
The regular reference design shows how to use it without a DC/DC: www.ti.com/.../cc2541em-rd
.:svend
Other Parts Discussed in Thread: CC2541 , CC2541EM-RD , CC2541-POSTAGE-STAMP-RD Does TI has any suggested ways to make the PCB layout for CC2541?
Can it achieve by making 2 layers PCB?