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TPS61291: Application Inquiry

Part Number: TPS61291

Hello Team,

My customer would like to operate this in constant boost mode. The boost chip is configured for a 3.0V output but the input voltage will be about 3.2V until it drains down below 3.0V. The converter operates cleanly when the input voltage is less than 3.0V but has about 135mV of ripple when they bring the input voltage up to 3.2V. We would like to know if this is normal and we can reliably operate this part this way.

And in this configuration, when the input voltage is > 3.0V, the output doesn't track the input voltage. It does rise above 3.0V to about 3.15V.

Thanks in advance