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→‎Components: U7 LMR51440SDRRR 5v
= Components =
== TPS54202DDCR Buck Converter (3v3) ==
* Voltage In: 4.5-28 (12-28v typical)
* [https://www.lcsc.com/datasheet/lcsc_datasheet_2410010331_Texas-Instruments-TPS54202DDCR_C191884.pdf Data Sheet]
Voltage In is provided from the first 4 pins of <code>J1</code> and this component is placed at <code>U9</code> with output voltage set point resistors <code>R25/R26</code> with values 100K and 22.1K respectively. Given the equation <code>(100/22.1 + 1) * 0.596 = 3.29</code>, the voltage output provided thru inductor <code>L2</code> in this configuration is set for 3.3 volts and provides the power to the ESP32 and related components. The 3v3 rail is also accessible at [TP](8) and voltage feedback at (TP13). == LMR51440SDRRR Buck Converter (5v) ==* Voltage In: 4-36* Voltage Out: 0.8-28* Max Current: 4 Amp* Package: 12 Pin WSON 0.8mm Height The component is placed at <code>U7</code> and there is a bodge jumping the voltage set point pin via <code>R19/R20</code> with a 1K resistor to correct for an in initial routing error of <code>R21/R18</code> ~18K and 100K respectively. This all results in a designed output voltage of 5 volts thru inductor <code>L1</code> and accessible at [TP](3) along with the voltage feedback at (TP10).
== M.2 (NGFF) Key E ==