Optimizing ESP32 WROOM-E Devkit Power Supply

[alexander96]

Hello, I am currently developing a PCB with a ESP32 WROOM-E, I used the Devkit Schematics I found here:
https://dl.espressif.com/dl/schematics/ ... v4-sch.pdf

I am currently using this voltage regulator:
https://www.mouser.de/ProductDetail/Tex ... Dk3hw4bA==

Unfortunately the power supply of the micro usb port and 5V phone charger ist not reliable and so the ESP32 crashes if there is a power consumption peak.

My PCB should exactly work for this use case so I need to fix my PCB Design so it works even if there is a power consumption spike.

Is there a simple way in fixing the power supply by adding some components to the design or did anybody of you had similiar problems and solutions for this?

Sincerly
Alexander

[alexander96]

Does nobody has an idea?
The power spike occours when I read out a RFID Card with the RC522 RFID Modul an then immediately make an http request afterwards.
The problem also occours when I use the newest version auf the ESP32 Devkit with a ESP32WROOM-E so its not just my PCB design.

I also tried to change the capaciator next to the ESP32 and next to the voltage regulator from 22uf to 100uf but it didnt change anything..

[Sprite]

One of the things I noticed is that your LDO has a dropout voltage of 1.2V which is pretty high - it means proper working isn't guaranteed when the power supply drops to 4.5V. Perhaps you can change for a LDO with a less high dropout voltage?

[tommeyers]

https://www.electronicproducts.com/choo ... -supplies/

Start here.

[becorey]

What is your 5v phone charger rated for? 500mA, 1A, 2A?

Are capacitors close to the esp32 power supply pins? 100nF and 1uF