ESP32/STM32 Power Supply System

When you need to power any microcontroller such as the ESP32 and the STM32, you do not plug it directly into the wall power outlets. The power coming out of the wall is too much for the microcontroller. Therefore, you need to design a power supply system that is capable to help you achieve the goal of powering these microcontrollers. We shall be doing one such power system in this project.

In this project, am going to design an ESP32/STM32 power supply system. From the research, I have taken note that the ESP32 and the STM32 are powered by a 3V3 output power supply system. For this project, our input will be a 5V input which will be through a USB port.

Components
1. USB port – 5V
2. capacitor- 68uF SMD and electrolytic
3. Capacitor – 120 uF
4. IC- LM2594M- 3V3------------Voltage regulator which takes an input up to 60 VDC
5. Diode- Schottky type of diode
6. Inductor- 100 uH
7. Connector_01x02; Terminal block

Schematic:
Here, the schematic main part is the LM2594M-3.3 voltage regulator which regulates the input voltage by stepping it down from 5V to 3V3 volts which is necessary for powering our ESP32/STM32. The voltage regulator will receive the 5V from the USB port then regulate it and pass it to the terminal block which will be an output of 3.3V at 500mA of power.

PCB Layout:
The PCB layout is carried out and here all the routing process takes place to ensure that all the components and the ground are connected by drawing the copper traces.

3D view
Here we generate the actual view of how the final PCB outlook will appear. This is the point where you even set the colors of your PCB to the required colors.
Generation of the manufacturing files;
1. Gerber files
2. Pick and place files
3. Drill files
4. BOM files

Project Elements

schematic-33.png (PNG, 6.1 KB)

33-layout.png (PNG, 11.86 KB)

33-3d.png (PNG, 59.01 KB)

Discussion (3 comments)

Volker Schmidt 2 years ago

Do not explain to an old engineer how to work. He knows it very well. Of course, the standard applications of manufacturers are often a good choice. It should be natural to mention the use in the article as well.

Simon Munyua Mugo 2 years ago

Well sir. Your point is home.Thank you

1 Comment(s)

Volker Schmidt 2 years ago

Your creative performance in this project is limited. The circuit corresponds in detail to the circuit proposal in the data sheet of the LM2594. So it wasn't you who designed the circuit, but Texas Instruments.

Simon Munyua Mugo 2 years ago

The work of datasheet is to make your work easier when doing any design. You don't work without datasheet and if the datasheet has the schematic that you need in your design, you pull it and proceed to the next stage. Like those are the basic principles in design work. And am glad that you went through the datasheet to compare what am doing. I added to capacitors to make the output signal more smooth and also added a USB input port and a two pin output port.

Deltor 2 years ago

This is in fact the most uncreative "work" I've seen for years.
It seems that you haven't read the datasheet.
You just stupidly copied the "Typical application" on page 2 - which is for 12V input voltage!
You didn't even adjust the inductor's value for the much lower 5V USB voltage.
This should be 33µH (see fig. 21 on p. 16).
You also stupidly copied these crazy values for C1 (from E6 series) and C2 (from E12 series) instead of choosing some more common values.
And - finally - what did you add - as you told - to the capacitors "to make the output signal more smooth"?
Just adding two connectors to an application is not enough!
No, no, no!

BTW: the "layout" picture is a joke, isn't it?
Another question: is that a "6BuF" at C1?

Simon Munyua Mugo 2 years ago

Design yours and share. After all am here to learn.

Deltor 2 years ago

I've already designed some of these and will of course not share them with kiddies like you who will claim them as their own designs.
Go ahead and build a real one yourself - not only 3d paintings of some imaginary thingies!
I already gave you a hint (inductor) to make that circuit work better.
And, please, shorten the pcb!
It looks like a racing lane for cockroaches.
And learn to read data sheets!

Another question: the 0805 or 1206 inductor is a joke, too?
One more hint: mount the USB plug the right way round! 8-]

Simon Munyua Mugo 2 years ago

You are too noisy for nothing.

Deltor 2 years ago

I know.
Sorry for nothing.

1 Comment(s)

ElektorLabs 2 years ago

Please stop making advertisements in your posts.

Simon Munyua Mugo 2 years ago

Thank you for your comment. Your point is noted. Although I was just advising anybody interested in where I design my boards maybe some might be interested in moving such a project to manufacture.