ADP2108AUJZ-3.0-R7 generates 3.36 volts and it looks like it's hot

Here I captured an image of the output voltage.

Hi DominusDRR,

Can you send on the board files for your design (Schematic, Layout, BOM) for us to review. You can send it directly to my email if you want.

Also, do you have some scope shot of the switch node together with VIN and VOUT that you can share. (No load and with 330ohm load).

Thanks and regards,

Jefferson

Hi.

Thank you very much for answering.

I attach the necessary information.

Input voltage of 5 V:

Vout (with 330 ohms load)

Voltage on terminal 4 (SW):

Vout with load:

The PCB is very small and there is not much space, possibly that's the reason:

The elements used are:

The inductor is: LQM21PN1R0MCHD:

https://www.mouser.ec/ProductDetail/81-LQM21PN1R0MCHD
 
 
The output capacitor is: VJ0805G106KXQTW1BC:
 
https://www.mouser.ec/ProductDetail/77-VJ0805G106KXQTBC

And input capacitor is: 

https://www.mouser.ec/ProductDetail/77-VJ0805V475MXQTBC   

Thanks again.

I forgot the schematic:

Hi DominusDRR,

Thank you for the files.

What caught my attention was the layout where I noticed that the SW node (encircled with blue) has three connections rather than having only one (inductor only) - can you clarify. Also, I noticed that the GND pin is connected to a very thin trace and don't see any local via that will connect it to a GND plane to keep the VIN - CIN - GND & SW - L - COUT -GND loop short.

Can you provide me with a snapshot of the layers (on the ADP2108 site) for me to see the connections clearly.

Thanks and regards,

Jefferson

Thanks for your help. Actually there is a confusion between pins 4 and 5. I made some bridges and cut some PCB tracks to "fix" the error and now the voltage is 3.0V without noise and with a load of 330 ohms.

Fortunately, we are in the prototype stage. Sorry 

Hi DominusDRR,

Good to know that the error are now fixed.

Since you are still in the prototype stage, I suggest that in your actual design you made some adjustments and make the high current paths thicker and short as possible. These paths includes the connection of CIN, L and COUT to ADP2108.

You can route the EN pin at the bottom  (with thinner trace) so that you can widen the Pin 5 to L trace or to have a shorter GND connection from CIN, Pin2 and COUT.

Happy to help.

Regard,

Jefferson