Dear Monolithic Power Systems,
I want to bring to your attention an issue we encountered while utilizing the MPQ4572GQB-P Buck IC for our 1.3V power supply design.
In our design, we have successfully created a 1.3V power supply with an input voltage (VIN) of 6.5V, following the circuit diagram and component values obtained from the Monolithic DC DC Designer Online tool. However, during our testing phase, we observed some instability in the output voltage.
At no load, the output voltage of the converter initially reads 1.3V, but it fluctuates intermittently. Upon probing the PG signal, we noticed that it experiences a low period followed by a high period. Additionally, when we applied a load to the 1.3V output, the output voltage dropped significantly to 0.4V, and the PG signal remained consistently low.
We have attached a waveform graph displaying the behavior of the PG signal at no load for your reference.
Could you please assist us in identifying the root cause of this instability in the output voltage and the behavior of the PG signal?
Blue Waveform is of PG signal and Pink Waveform is output of 1.3V
