The TPS54040DGQ from Texas Instruments is a buck switching regulator IC with an adjustable output voltage between 0.8V and 5V. It has a 500 mA output current and is packaged in a 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width). This IC is ideal for applications such as low dropout linear regulation, LED lighting systems, switch-mode power supplies, and battery-powered systems. It features a low operating current and wide dynamic range operation, which allows it to handle large transients when needed. Additionally, it has built-in over-voltage, over-temperature, and current-limit protections.