The TPS40170QRGYRQ1 from Texas Instruments is a positive-output step-down DC-DC buck regulator controller Integrated Circuit in a 20-VQFN (3.5x4.5) package.
The TPS40170RGYR from Texas Instruments is a positive output step-down DC-DC buck regulator controller Integrated Circuit in a 20-VQFN (3.5x4.5) package.
The TPS40170RGYT from Texas Instruments is a buck DC-DC controller Integrated Circuit with positive output and step-down, in a 20-VQFN (3.5x4.5) package.