1.25 MHz fixed-frequency buck — what the switching rate buys you
The TPS62044DGQR is a fixed-output (1.8 V) step-down converter from Texas Instruments, switching at 1.25 MHz and rated for 1.2 A continuous output.
Input rail and output — sizing the supply
The fixed 1.8 V output is set internally — no external feedback divider needed. The synchronous rectifier (integrated low-side FET) eliminates the external Schottky diode.
Package and thermal — the exposed pad matters
The 10-HVSSOP (3.00 mm × 3.00 mm) has an exposed thermal pad on the bottom. Without the pad soldered to a thermal land, the part derates significantly above 85 °C ambient.