Buck boost mode control circuitry controls {HEAD ~ the buck boost voltage regulation circuitry} using {TAIL ~ peak current mode control} in a buck mode of operation and valley current mode control in boost mode of operation responsive to the monitored input current 
Buck boost mode control circuitry controls { HEAD ~ the buck boost voltage regulation circuitry } using { TAIL ~ peak current mode control } in a buck mode of operation and valley current mode control in boost mode of operation responsive to the monitored input current
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