Description: The Texas Instruments PTH04000WAST is a 3A adjustable, synchronous step-down DC-DC converter in a horizontal, surface-mount package. It is designed to provide a regulated output voltage of 3.3V or 5V from an input voltage of 4.5V to 18V.

Features:
- High efficiency: up to 95%
- Low quiescent current: - Output voltage adjustable from 0.8V to 5V
- Output current up to 3A
- Over-temperature protection
- Over-current protection
- Short-circuit protection
- Thermal shutdown

Applications: The PTH04000WAST is suitable for a wide range of applications, including portable electronics, automotive, industrial, and consumer applications. It can be used to power microcontrollers, FPGAs, ASICs, and other digital logic circuits. It is also suitable for powering LED drivers, RF transceivers, and other low-power analog circuits.