Li-ion battery based ESP32-WROOM-32 board
Li-ion x1 cell operation voltage is 2.8V ... 4.2V The power supply voltage of ESP32-WROOM-32 is 3.3V.
To get 3.3V efficiently, TI's Switching Regulator IC TPS63000DRCR, which can switch Step-Down / Step-Up automatically, is attractive.
However, this chip has narrow pins, making it difficult to solder even if a board is made. So, I tried the Fusion PCBA. I registered Gerber data on 5/30 and received boards on 6/15. Incredibly fast! The finish is also Good and I am satisfied!
However, there was one point that was disappointing. The space between five lands was expanded by the Fusion side. This board was designed with L1 = GND and L2 = 3.3V, so L1 were short-circuited with the L2 by the four outer lands...
Fortunately, the short detection of TPS63000 has been successful.
As a countermeasure, insulation was obtained by scraping the land surface with a 3.5mm drill. :D
