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|
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 😎