Input range and output adjust — supply rail compatibility
The 9 V maximum input covers 5 V and 9 V rails cleanly but does not reach 12 V or 24 V industrial buses — those need the higher-voltage TPS621x0 variants. The adjustable output is set with a resistor divider; the 0.8 V reference means a 3.3 V output requires a 3.125:1 divider ratio, which is straightforward with 1% resistors.
The 8-SOIC package's thermal resistance limits full 500 mA operation unless the board has a pour plane under the IC.