I was looking for inspiration from this example - TIDA-01632 BLE Car Access Satellite Node Reference design.
It utilises the regulator TPS7B8233QDGNRQ1
On its specification the output is is 5v(nom) 3.3V Min
It is used to supply the CC2640R2FTWRGZRQ1 which Normal operation: is 1.8 to 3.8 V
I do not understand, the datasheet of the regulator, states it is fixed output options of 3.3V or 5V.
I have read the datasheet too many times now and cannot see any differing part numbers or configurations to distinguish the voltage operation.
What have I stupidly missed this time?