1.2A buck — the fixed 1.8V rail regulator
The Texas Instruments TPS62044DRCRG4 is a step-down (buck) DC-DC converter delivering a fixed 1.8V output at up to 1.2A from input voltages between 2.5V and 6V. It integrates a synchronous rectifier for higher efficiency in the load range typical of low-voltage logic rails — think 1.8V VDD for DDR memory terminations, FPGAs, or MCU I/O banks in portable or embedded systems. The 1.25MHz switching frequency keeps the inductor small, around 4.7 µH to 10 µH, which helps when board area is tight.
Obsolete — no new designs here
That means Texas Instruments has ended production; there is no last-time-buy window remaining through the authorized channel. No official successor is listed on the record, so a pin-compatible drop-in replacement is not confirmed from the manufacturer. If this is a new design, skip this part and look at current TI buck converters in the same 1.2A / 6V input class.
10-VSON footprint and thermal reality
The TPS62044DRCRG4 comes in a 10-VFDFN Exposed Pad package (supplier device package 10-VSON, 3x3 mm). The 1.25MHz switching edge also makes the input loop layout critical: keep the input capacitor (10 µF ceramic recommended) within a few millimetres of the VIN and PGND pins to avoid ringing that eats into efficiency.