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PNMini – Positive/Negative Power Supply Module


High-performance Easy-to-use Mini Power Modules for Makers. Innovative circuitry enables positive/negative supply in one module.

What is PNMini?

PNMini is a family of high performance, easy-to-use DC/DC Power Modules for DIY electronics.

PNMini can be used as positive supply or negative supply. If both positive and negative supply rail are needed, just connect two PNMini modules together. No hardware changes are required.

Positive and Negative Configuration


Dual Supply Configuration



PNMini is available in a small PCB package that enhances thermal performance and allows for hand soldering or plugin use. It provides +3.3V/-3.3V, +5V/-5V, or +12V/-12V output directly to your circuits requiring no external components.

PNMini family has two output current options to meet your system needs:

  • PNMini-500mA: supports up to 500mA output current
  • PNMini-2A: supports up to 2A output current

Shown in the figure below is a PNMini-2A module. All the application instructions given below use PNMini-2A as an example

How do I use it?

Supply Rail Configuration

PNMini is extremely easy to use. There is no external component required. The three terminals of PNMini are input voltage VIN, output voltage VOUT, and ground connection GND. The VIN pin is always fixed as Pin 3. Depending on the system requirements, Pin 1 can be positive output VOUT(+) or GND; Pin 2 can be GND or negative output VOUT(-).

Input Range

The input range of the PNMini family is very wide to cover more DIY electronics applications. For PNMini-2A, the input range for positive output is 3.5V to 27V. The input range for negative output is 2.7V to 27V.

Output Programming

The output voltage is programmable through three feedback resistors connected from VOUT terminal to GND terminal.



Application Examples

PNMini can be used in all kinds of DIY electronics projects. Below are two application examples:

1. Arduino drone with longer battery life

PNMini can be used to power your Arduino drone. A miniature Arduino board is usually powered by 3.3V. The motors and sensors are usually 5V. You can use 3 li-ion battery stack and two PNMini to get the voltage you want! It’s more efficient than LDO. PNMini provides up to 92% efficiency while LDOs can hardly achieve more than 50% efficiency. That’s a 40% longer battery life for your design!


2. A simple ECG amplifier

Another application example is a simple ECG amplifier which can display your ECG waveform on a oscilloscope. For sensor or amplifier applications, dual supply is often preferred. Positive supplies are everywhere, but sometimes it’s difficult to find a negative power supply. PNMini solves the problem by generating both positive and negative supply from a single source.


The author Pantech