LMR60440-Q1: Loop response

Hi Peter,

The loop response depends heavily on the external components used. Can you share the customer schematic?

Regards,

Niranjan

Hi Niranjan,

Please check the schematic here:  RE: LMR60440-Q1: Schematic review 

Regards,

Peter

Hi Niranjan,

Sorry I sent the wrong schematic before, please check the right one.

R2801224-TFT1N7A_TFT_1230150161520-A0_20250722_EP1(V00-C00) Copy.pdf

Regards,

Peter

Hi Peter,

Here the device is set to be in AUTO mode and the load is light (50 mA written on the schematic). So the device operates in PFM.

PFM is like a hysteretic mode of control and is inherently stable. Loop response is not very meaningful in that case. And the actual switching frequency would also be reduced at light loads. So the reduced crossover frequency is not anything to be concerned about.

Regards,

Niranjan

Hi Peter,

Let me know if you have any further questions. Otherwise you can close the thread by clicking the resolved button.

Regards,

Niranjan

Hi Niranjan,

They tested this bode plot in full load, not light load.

Regards,

Peter

Hi Peter,

Do they have any other capacitors on the 3.3V output rail? Maybe at any downstream components?

Regards,

Niranjan

Hi Niranjan,

Let me check tomorrow.

Regards,

Peter