MPM3612- Not supply 5V just supply 0.6V

DC-DC Power Converters
1

Hi, I have a problem with MPM3612 layout and I don’t know how fix it. I have 7,4V to 9V for input and I want 5V to output. I use R1=1613k and R2=220k to configure output and use a 22pF capacitor to stable Vf as schematic examples. But nothing works. To discard soldering and footprint issues, I test it with version MPM3612-33 that has same footprint and without divisor resistors and it works perfectly. Vout has 3,3V as MPM3612-33 says in datasheet.
I found in datasheet that if some issues happends, device will responds with 0,6V on Vout.
I will share you some images with layout and schematics.

schema
schema868×667 75.1 KB

bottom
bottom967×945 45 KB

top
top859×929 56.2 KB

Best regards and thanks in advance,
David

2

Hi David,

Welcome to MPS technical forums, sorry to hear that your facing issues with MPM3612.

MPM3612 has two versions, ‘-33’ is a dedicated fixed 3.3V output voltage version, whereas the one used in your design is an adjustable one.

Looking at the schematic it looks OK overall, what is the Vout you are observing and what load current?

Can you share some waveforms such as Vin & Vout?

Regards,
Adhish