Fixed 3.3 V rail for sensor and MCU loads
The TPS62237DRYR is a synchronous step-down converter from Texas Instruments that delivers a fixed 3.3 V output at up to 500 mA from an input range of 2.05 V to 6 V.
Input range and output current — sizing the rail
With a minimum input of 2.05 V, this part can run directly from a single Li-ion cell (3.0 V to 4.2 V) or a regulated 3.3 V bus. The 6 V maximum input limits it to low-voltage supplies — not for 12 V or 24 V industrial rails. The 500 mA output ceiling covers small MCU cores, sensor transmitters, and Bluetooth/Wi-Fi modules; anything above that needs a higher-current sibling in the TPS6223x family. The 2 MHz switching also pushes ripple into a band that is easier to filter with small ceramics.
Temperature grade and package — where it fits physically
The 6-UFDFN package (1.45 mm x 1 mm) is a tiny SON with a centre pad for thermal dissipation; the board layout must match the recommended land pattern in the datasheet to avoid solder bridging and ensure adequate heat transfer.
The base product number TPS62237 covers multiple output voltage options and package variants; the DRYR suffix identifies the 6-UFDFN tape-and-reel variant.