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MAX8815 Step up converter

In this project I wanted to make a step up converter based on the high efficiency MAX8815 integrated circuit.
MAX8815 is a great component!

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This step-up converter 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

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.

Max8815  board

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

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

PCB production.

The board was made by PCBway.


I decided to order the pre-assembled PCB with the SMD components.

The result was excellent.
I greatly appreciated the assistance with continuous communication on the progress of the production.

Before shipping, they sent me photos of the product, to receive my "ok": this is very important!

Where to buy.

if you want to test this circuit, you can purchase the PCB pre-assembled with the smd components  at the following link:  https://www.pcbway.com/project/shareproject/MAX8815_step_up_converter_7f76c33b.html

It is possible to purchase  only the PCB if you prefere

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 development application.

The project was created using Kicad

Opensource Hardware certification.

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

License.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. https://creativecommons.org/licenses/by-sa/4.0/

Green_BMS_max8815_00.pdf

Electrical diagram

Adobe Portable Document Format - 71.22 kB - 01/12/2022 at 10:00

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