The TPS62221DDCRG4 is a fixed-output step-down (buck) converter from Texas Instruments, delivering a regulated 1.5 V from an input range of 2.5 V to 6 V. It targets low-power rails — think MCU core voltage, sensor bias, or wireless-module supply in battery-powered or 3.3 V/5 V systems. The fixed output means no external feedback divider; the 1.5 V is set internally, saving two resistors and one feedback-node noise source.
400 mA output — sizing the load budget
Rated for 400 mA continuous output, this regulator fits sub-400 mA rails. The 1.25 MHz switching frequency lets the designer use a small inductor (typically 2.2 µH to 4.7 µH) and a 10 µF output cap, keeping the BOM compact.
It comes in a SOT-23-Thin (TSOT-23-5) package — five pins, 2.9 mm × 1.6 mm footprint, 1.1 mm max height. The thin profile fits low-profile enclosures like SSD modules or handheld instruments.