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TPS61029 Output Regulation

Other Parts Discussed in Thread: TPS61029

Hi, we are using the TPS61029 with the output voltage set to 3.3V but have encountered a situation where the output voltage jumps to 8V.  The plot shows the input voltage, output voltage and load current.  As you can see, when the load current spikes the input voltage drops (we are running of a simulated battery using a benchtop supply and series resistance) but stays above the 0.9V minimum.  After the period of higher load current the output voltage jumps to 8V and stays there.  What could be causing this behavior?