The　widely　utilization　of　renewable　energy　with　low　output　voltage　makes　the　high　voltage　ratio　boosting　converter　more　popular.　This　article　introduces　a　non-isolated　low　input　ripple　high　step-up　extendable　hybrid　DC-DC　converter.　The　proposed　converter　is　based　on　a　two-phase　interleaved　BOOST　converter　and　switch-capacitor　(SC)　boost　circuit.　One　of　the　BOOST　channels　charges　the　capacitors　in　the　SC　circuit,　and　the　other　BOOST　channel　is　connected　in　series　with　the　capacitors　to　supply　power　to　the　load.　Benefiting　from　this　structure,　the　converter　achieves　high　voltage　gain,　reduced　semiconductor　voltage　stress,　and　low　input　current　ripple.　Moreover,　the　converter　can　be　extended　by　increasing　the　number　of　switch-capacitor　boost　units　or　the　parallel　BOOST　channels　to　perform　better　in　voltage　gain,　input　current　ripple,　and　power　density.　The　principle　of　operation,　theoretical　analysis,　expansion　scheme,　and　comparison　with　similar　topologies　are　introduced　in　detail.　Finally,　a　100W　prototype　is　implemented　to　verify　the　validity　of　the　theoretical　analysis.　©　2019　IEEE.