What this PMIC was designed to do
The TPS658621AZGUT is a power management IC from TI's TPS658 family, packaged in a 169-ball BGA MicroStar array measuring 12x12 mm. It was specified for portable, battery-powered devices requiring integrated battery management, multiple regulated supply rails, and LED display driver outputs — think smartphones, tablets, handheld instruments, and similar mobile systems where a single PMIC handles the power tree.
Package footprint — the fit constraint
The 169-LFBGA package (TI's MicroStar, 12x12 mm) is a fine-pitch BGA. Surface-mount only; the Tape & Reel shipping format is standard for volume placement.