I’m considering to use the MPM3810 or MPM3820 for a battery powered and wearable controller. The system requires a single 3.3V rail capable of >1A, thus the aforementioned chips seem suitable. But I noticed that only the MPM3820 is “ideal for single cell Lithium batteries”. But I could not find any difference apart from the value of the integrated inductor and a lower R_dson. Is there more to this?
I’m also wondering about the chip’s behavior when V_in approaches V_out. If V_in reaches 3.3V, will it enter 100% duty cycle and remain stable? Or should there be a save delta voltage between the in and output, and how big would this be? A smaller minimum delta results in more usable capacity of the battery, which is very valuable to my compact design.
Is its stability at low delta effected by whether it’s a fixed output or has external feedback resistors?
Thank you in advance for your time and help.