The RJK0331DPB-01J0 is a switching regulator IC manufactured by Renesas. It is a fixed 3-channel, low-dropout regulator with a 0.8V to 5.5V output voltage range. It is designed for use in high-density applications, providing precise voltage regulation, fast transient response, and low quiescent current. The IC includes short-circuit protection, overcurrent/thermal protection, soft-start, and output voltage tracking, making it suitable for many applications.