What the 1.5 A, 3.3 V fixed output means for your rail
The TPS62111RSAT delivers a fixed 3.3 V output at 1.5 A continuous from a 3.1 V to 17 V input rail — a common intermediate bus or battery voltage range. Switching at 1 MHz lets you use a small inductor — typically 2.2 µH to 4.7 µH — which shrinks the board footprint. The 16-QFN (4x4 mm) package with exposed pad pulls heat into the PCB copper, so the 1.5 A rating holds up to 125°C junction with proper thermal design.
The base product number TPS62111 covers a family of fixed-output voltage options, so if a future revision needs a different output voltage, the pin-compatible sibling is available without a layout change.
Package and mounting — 16-QFN with exposed pad
Surface-mount 16-VQFN Exposed Pad, supplier device package 16-QFN (4x4 mm). The 1 MHz switching edge demands a tight loop from input cap to VIN pin to GND plane; keep the input capacitor within 2 mm of the IC.