What this part does in your rail
The TPS62826DMQR is a synchronous step-down (buck) regulator that delivers up to 3 A from a 2.4 V to 5.5 V input rail — typical for 3.3 V or 5 V buses, Li-ion battery packs, or USB-powered designs. The 2.2 MHz switching frequency keeps the inductor small enough to fit a 1.5x1.5 mm VSON package layout without sacrificing efficiency.
Output adjustability and thermal range
Output voltage is adjustable from 0.6 V up to 4 V, so it can power a 1.2 V core rail, a 1.8 V I/O rail, or a 3.3 V peripheral rail from the same BOM entry. Synchronous rectification is built in, which means no external Schottky diode and a higher efficiency at light loads. The 6-VSON-HR package (1.5x1.5 mm) with an exposed pad pulls heat into the PCB copper — the thermal pad layout is the one thing to get right on the board.
How it compares to a similar automotive-grade buck
The LMR33630APCQRNXRQ1 is an automotive AEC-Q100 buck with the same 3 A output and a similar 2.1 MHz switching frequency, but its input range starts at 3.8 V — so it cannot run from a 2.4 V rail. The TPS62826DMQR's wider 2.4 V minimum input lets it operate from a single Li-ion cell or a 3.3 V rail with margin, while the LMR33630 needs a 5 V bus or higher.