MULTI-PHASE BUCK-BOOST CHARGER ARCHITECTURE

A multi-phase buck-boost converter system can include an external discrete component power stage and a controller integrated circuit. The external discrete component power stage can include a first and second phases each respectively having an input half bridge including first and second or third and fourth discrete switching devices and corresponding first and second discrete inductors operable as first and second buck stages. The controller integrated circuit can include a first and second output half bridges respectively corresponding to the first and phases and respectively having fifth and sixth or seventh and eighth integrated switching devices respectively coupled to the first or second discrete inductors and respectively operable as first and second boost stages in conjunction with the first and second buck stages as a first buck-boost converter and controller circuitry that operates the first and second buck-boost converters to produce a regulated output voltage from an input voltage.