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