TPS73733DCQ (Texas Instruments) is a 1 A low-dropout (LDO) linear regulator with a fixed 3.3 V output and reverse current protection, in a SOT-223-6 package.

• 2.2 V to 5.5 V input voltage range · 1 A output current
• Stable with a 1 µF or larger ceramic output capacitor
• 1% initial accuracy · less than 20 nA typical shutdown current
• Thermal shutdown and current limit · NMOS topology with low reverse leakage current

Data per Texas Instruments TPS737 datasheet.