Finally I finished the prototype for the MPPT solar charger board with new Linear LT8490.
It´s a 4-layer board with a size of 30mm * 60mm, height about 15mm with correct SMD capacitors (those on the picture are temporary). The board is designed to connect battery and solar panel with terminal lugs, the UART output is available, there are two LEDs (status and fault), battery temperature sensor input and the component side is equally flat for attachment to a heat sink.
Special thanks to Tage Bjorklund from Linear Technology for support and recommendations on the board layout (which is indeed critical due to high currents and sensitivity to noise).
The board passed some initial tests with a 3S LiPo configuration. Here are a few numbers with different solar panel voltages.
| Solar Input | Battery Output |
| 28,3V/0,5A | 11,95V/0,95A |
| 31,3V/0,6A | 11,99V/1,20A |
| 33,5V/0,47A | 11,99V/1,28A |
| 33,1V/1,1A | 11,99V/2,7A |
| 33,7V/0,6A | 11,99V/1,75A |
| 21,3V/1,65A | 11,98V/2,69A |
| 18,5V/0,35A | 11,6V/0,6A |
| 21,7V/1,29A | 11,98V/2,34A |
| 10,8V/1,05A | 11,99V/1,3A |
| 10,7V/1,02A | 11,96V/0,9A |
| 10,77V/0,99A | 11,95V/0,95A |
A dedicated page with design details will be up soon. Stay tuned…
Oh, btw, looks like mine is the first DIY board for the LT8490 😎
Could you please post more design details about your DIY LT8490 board? I am also planning on building one. Thank you!
Not anytime soon…
Hello Michael,
do you have one of your LT8490 MPPT Solar Charger Boards for Sale?
Or do you know about any charging devices which are working with the LT8490?
I want to create a little solar isle solution for my home, to charge some Lead Acid Accus.
I found the LT8490 via soogle search and am very enthused about this IC.
But i have no idea how to get it…
Greetings from Lübeck!
Kevin