The Texas Instruments TPS658642ZQZT is a power management IC (PMIC) designed for portable equipment — battery-powered handhelds, tablets, and similar devices that need multiple regulated rails from a single controller.
Package reality — 120-VFBGA Microstar Junior
The part comes in a 120-VFBGA (120-ball fine-pitch BGA) with a 6x6 mm body, designated as Microstar Junior by TI. That is a dense, low-profile package — 0.50 mm ball pitch, no exposed thermal pad.
Obsolete — no official successor named
Buyers should expect to qualify any alternative from the TPS658 family on pinout, register map, and power-up sequencing before committing a board spin.