OVERVIEW

Max8815 board is Step-up converter based on MAX8815.

The project is designed according to MAX8815 data sheet:

https://datasheets.maximintegrated.com/en/ds/MAX8815A.pdf

This circuit is useful for powering a 3.3v - 5v circuit (such as a microcontroller) through a lower voltage battery, such as: lithium cell, LTO cell, Ni-cd, etc ...

Max8815 is a high efficiency circuit: this feature is essential in a battery powered system, where every single mA saved is important for the battery life!

I decided to share this project to allow everyone to use, try and experience the MAX8815 IC.

The project is shared on Github and open to modifications and improvements.

The circuit has the following features:

Input: 1.5V - 5V

Output: 5V fixed or 3.3V - 5V (adjustable).

The max output current depends on input voltage. the board goes into protection when the input current exceeds 1A

INSTRUCTIONS

5V Fixed output:

1. Set J3 shunt to "OFF" position
2. Set J4 shunt to "Normal" position
3. Set J5 shunt to "5v" position
4. Connect Input power supply (range 1,5v - 5v)
5. Set J3 shunt to "ON" position
6. Check D1 led lights ON
7. Connect the output load

Adjustable output:

1. Set J3 shunt to "OFF" position
2. Set J4 shunt to "Normal" position
3. Set J5 shunt to "Adj" position
4. Connect Input power supply (range 1,5v - 5v)
5. Set J3 shunt to "ON" position
6. Check D1 led lights ON
7. Set the output voltage (from 3,3v to 5v) by RV1 potentiometer

Other settings:

By J4 shunt it is possible to set "FPWM" mode according to MAX8815 data sheet

OPENSOURCE HARDWARE CERTIFICATION

Max8815 board has been certified as open source hardware by the Open Source Hardware Association, with the UID: IT000008.