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The term "buck-boost" originally referred to a converter that took a positive voltage and converted it to a negative voltage. Now, the term refers to a converter that provides an output voltage from an input voltage range that can be higher and lower than the output voltage. There are four switch, single inductor converters (e.g. TPS63000) that change from being a buck converter if Vin>Vout to a boost converter if Vin<Vout. A boost converter or boost converter based WLED driver with external synchronizing switch can be configured as a SEPIC converter, with two inductors and additional capacitor (instead one inductor in a boost configuration) in order to provide a positive output voltage that is in between the positive input voltage range. A high-side, PMOS buck converter with external synchronizing switch can be configured as ZETA converter, with two inductors and additional capacitor (instead of one inductor in a buck configuration) in order to provide an positive output voltage that is in between the positive input voltage range.
In this case, what you would call an inveted Buck Boost?
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