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I reversed engineered a buck-boost converter module because i was unable to find the schematic of it. more in comments : r/AskElectronics
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Figure 3 from A synchronous buck-boost converter on a Silicon-On-Sapphire 0.5µm process | Semantic Scholar
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Single-IC Converter Operates Buck and Boost to Provide an Output that is Within the Input Voltage Range | Analog Devices
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