Buck regulator with synchronous rectification for low-voltage rails
The TPS62227DDCT is a synchronous step-down (buck) converter from Texas Instruments, delivering a fixed 1.2 V output at up to 400 mA from a 2.5 V to 6 V input rail.
400 mA output and 1.25 MHz switching — sizing the rail
At 400 mA continuous output, this part targets low-power rails — think MCU core, I/O, or sensor supply — not a main system bus. The 1.25 MHz switching frequency is a middle ground: higher than the 400 kHz of the LMS3655MQURNLRQ1 buck (which lacks synchronous rectification), but lower than the 2.1 MHz of the LMR33630APCQRNXRQ1. That means you can use a smaller inductor than a 400 kHz design, but switching losses will be higher than a 2.1 MHz part — a trade-off that matters in thermally constrained enclosures.
SOT-23-5 Thin package — footprint and handling
The SOT-23-5 Thin package is a low-profile, 5-pin surface-mount package. It is compatible with standard SOT-23-5 land patterns.