I would like to use MPM3833C to converter 5V to 3.3V. I have used the DC DC designer online to check how much the 5V input swing range can be allowed. The Min. input voltage is 5V, otherwise a notice come up- Vout is too large due to the minimum off time limitation under this switch frequency.
Will the MPM3833C not convert 4.8V to 3.3V properly?
Qingshan
I am also interested in the question, is it possible to have an answer?
Hello all,
I am looking into this issue, and will get back to you all in couple of days.
Thank you,
Vinh Tran
Field Applications Engineer
Hello all,
The DCDC Designer tool has some headroom for voltage drop on the inductor and FET. So although the calculated duty cycle is ~68%, the actual maybe higher and not supported.
Try checking out the MPM3834C.
Thank you,
Vinh Tran
Field Applications Engineer
Hi Vinh,
your answer mean you don’t recommend using MPM3833C in 5V to 3.3V conversion?
Hello antonio.galli,
This should still work from 5V → 3.3V. We have EVM3833C (monolithicpower.com) if you would like to test out the chip.
Regards,
Vinh Tran
Hi Vinh,
I had already ordered the EVM3833C to check the device to replace the EN5337QI present on several of our projects.
The choice to use the MPM3833C was made keeping in mind your indications for replacing Intel / Empirion devices in EOL https://www.monolithicpower.com/en/design-tools/reference-design-partners/power-replacements- for-intel-enpirion.html # Intel_Enpirion / and I was expecting a firmer confirmation of the choice.
In the next few days I will carry out tests with the EVM3833C and I will keep you informed.
Best regards,
Antonio
Hi there,
I’am in same situation looking for Empirion replacement and looking for 5v → 3.3V Dc/Dc.
I have selected confidently the MPM3833C but now I’am doubting about that product. I’am reading contraditoring thing between datasheet and DCDC designer, more precisely on Switching frequency which is 1150KHz on datasheet, and 1250Khz on my DC DC designer tools.
I’am trying to fix the confusion and MPS Engineer is requiered !!
best regards.
Hello,
The switching frequency should be 1150 kHz as specified in the datasheet. You can check the sizing of any external discrete components with your module using the sizing equations as specified in the MPM3833C datasheet to verify the sizing of the parts as recommended by the DC/DC designer.
The output resistors you have should be fine. Double check the sizing of input and output capacitors as they are functions of the switching frequency.
Thank you for bringing this to our attention.
Best,
Krishan
