Little ATmega 328 Board (Arduino Nano compatible) with 2 power MOSFET´s

My next project is on the way. It's (as almost always) an Atmega328 board again. This MCU still meets almost all of my requirements and it is cheap to buy. The dimensions are only 40mm x 50mm.

On the board there is again a power supply for 5V (buck regulator). I did not use reverse polarity protection because this is not absolutely necessary due to the use of a power input socket (but If the power socket is not to be used, a screw terminal can also be installed). There is also an EEPROM as well as a 9 mm buzzer and connection options for a USB / TTL converter and I2C bus.

The special feature are 2 Power MOSFETs. These are controlled by a LowSide MOSFET driver in order to achieve good switching behavior with very short pulses (PWM duty cycle close to 0% or 100%). I also hope that this will reduce the power loss (heat generation), because each of the MOSFETS should be able to reliably control 3A at 1kHz PWM (this is the maximum for the JST sockets and the thickness of the conductor tracks are dimensioned that way). The operating voltage is 7V - 18V (the limiting factor is the used MOSFET driver (MIC4427: 18V)).

 

 

 

 

My KiCAD project files can be downloaded from my Google Drive.

 

 

KiBoard4.zip
MD5: 66CA7C3D6ED62249DBB1EDCADB2F57A1
SHA256: 30567949E02D2276559D1115135B24047BAA9E08B93609C10C0325357B58657E

There is another archive in the ZIP files. This can be uploaded directly to a board manufacturer (I use Seedstudio or JLCPCB) to order professional PCBs in your desired color.

My project is free for private use. It is aimed at experienced people. I take no guarantee! Duplication is at your own risk and responsibility!

You are welcome to customize or modify my project and publish it. However, you always have to refer to the origin!