TPS2124 is a surface mount device and it was characterized as such. The TPS2124 is similar to the TPS2120 and so you can use the TPS2120 EVM as a reference for your design.
What is the event that is happening here? Is this waveform replicated on VOUT? ST following the IN1 voltage is acceptable/expected since it is connected to IN1 via a resistor divider network. Secondly, because the voltage recovers, there might…