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Replying to @l0wagner

3.6V is fine inasmuch as the RT6150 power supply in the Pico can work with it, but I’m not sure whether there’s any benefit; at low current draw — we’re always below 10 mA — it seems happier boosting than bucking. https://www.richtek.com/assets/product_file/RT6150A=RT6150B/DS6150AB-04.pdf

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