300 mA step-down for rail generation
The TPS62205DBVRG4: The fixed 2.5 V output eliminates the feedback divider, saving two resistors and one feedback-node noise source on the board. The synchronous rectifier keeps efficiency above 90 % in the middle load range — relevant if this rail runs a sensor or a low-power MCU core.
Package and footprint — SOT-23-5 layout
The device comes in a SC-74A / SOT-753 package, also listed as SOT-23-5. Five pins on 0.95 mm pitch — the layout is straightforward: input cap and output cap close to the respective pins, inductor between SW and output. The 1 MHz switching lets the inductor drop to 4.7 µH or 10 µH, keeping the total solution footprint under 30 mm². No exposed pad to solder, so the thermal path relies on the copper area connected to the GND pin.