1 A at 4 MHz — the switching frequency defines the inductor choice
The TPS628610YCHR is a 1 A continuous-output step-down (buck) converter from Texas Instruments, switching at a fixed 4 MHz. That 4 MHz rate lets you use a small inductor — typically 0.47 µH to 1 µH — which keeps the overall footprint tight on a space-constrained board like a wearable or IoT module. The adjustable output goes from 0.4 V up to 1.9875 V, so it can power a 1.8 V or 1.2 V core rail directly.
Housed in an 8-pin DSBGA (0.66 x 1.36 mm) — a wafer-level chip-scale package. The 0.4 mm ball pitch demands a controlled solder-paste stencil and a reflow profile matched to the board thickness; a 4-layer PCB with a solid ground plane under the die helps thermal spreading. The synchronous rectifier is integrated, so no external Schottky diode is needed.