The TPS62135RGXR from Texas Instruments is an adjustable buck switching regulator Integrated Circuit with 1 output at 0.8 V, with 3.5 A and 4 A current ratings, in an 11-VFQFN package.
The TPS621351RGXR from Texas Instruments is a buck switching regulator Integrated Circuit with positive adjustable 0.8 V output, with 1 output at 4 A and a 3.5 A rating, in an 11-VFQFN package.
The TPS621351RGXT from Texas Instruments is an adjustable buck switching regulator Integrated Circuit with 0.8 V output, 1 output at 4 A and a 3.5 A rating, in an 11-VFQFN package.