MP2225 PFM/PWM switching point

DC-DC Power Converters
1

Hi,

I can’t figure out from the datasheet what is the switching point between the PFM/PWM modes?
If I have a load of 400mA, what will be the mode of operation? PFM or PWM? does it depend on the output voltage?
Does the “MPS DC DC Designer” simulates the PFM mode? I tried decreasing the Iout but haven’t noticed any increase in the voltage output ripple or change in the switching frequency.

Thank you in advance,
Alex

2

Hi Alex.Kucherov,

Welcome to the MPS Technical Forum. I will look into your questions concerning the MP2225 mode of operation and provide an update soon.

3

Hi Alex.Kucherov,

Thank you for your patience. On Pg. 12 of the datasheet under the section “AAM Operation” you’ll find this paragraph:

image

I realize this is not clear on what exactly is defined as the “light load condition”. I am currently in contact with our AEs for clarification. Regarding the DC/DC Designer, the “Typical Waveforms” in the simulator show behavior related to PWM mode, but I am working on confirming this for you as well.