Could you provide BQ25570EVM evaluation data with piezoelectric generator?
My customer would like to know how it works when the energy generation is discontinuous.
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Unfortunately, I have no operational data using a piezo power source. Keep in mind that the piezo must be rectified to a dc voltage that charges the input capacitor and the open circuit voltage must clamped to 5.5V. The converter then pulls energy from the capacitor until the capacitor voltage drops below the MPP threshold. The datasheet plot below shows this type of operation, where VIN_DC in pink is the input capacitor voltage, the inductor current in blue and the switch node in green.