What this 1 A automotive buck regulator does for your rail
The TPS6281109QWRWYRQ1 is an automotive-grade synchronous buck regulator that delivers a fixed 1.15 V output at up to 1 A from a 2.75 V to 6 V input rail — a common point-of-load for CAN transceivers, sensor supplies, or MCU core rails in body electronics or ADAS modules. The 1.8 MHz to 4 MHz switching range lets you size the inductor for a compact footprint while keeping switching losses in check — a practical choice when the ECU layout is tight and the 1 A load doesn't demand a large output cap.
Switching frequency and inductor sizing trade-off
At 4 MHz the inductor can drop to 0.47 µH or 0.68 µH, saving board area, but you give up some light-load efficiency. Dropping to 1.8 MHz recovers efficiency at lower output currents but needs a 1 µH to 2.2 µH inductor — a choice the designer makes by setting the RT pin resistor.
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Package and thermal handling for the 9-VQFN-HR
The 9-VQFN-HR (3x2 mm) package with wettable flank terminals is designed for automated optical inspection — the side plating lets the solder-paste fillet wick up the flank, giving a visible joint after reflow.