A buck boost voltage converter circuit has a capacitor pump circuit for boosting an input voltage in {TAIL ~ a first mode} of operation when {HEAD ~ an input voltage} is below a desired voltage level 
A buck boost voltage converter circuit has a capacitor pump circuit for boosting an input voltage in { TAIL ~ a first mode } of operation when { HEAD ~ an input voltage } is below a desired voltage level
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH