3-Level Buck Controller with Passthrough Mode

The RAA489300 is a high-performance buck controller designed for a 3-level buck topology. This topology delivers exceptional efficiency and significantly reduces the required inductance for output voltage regulation. Its innovative design minimizes power loss and reduces system size, making it ideal for compact, high-performance applications. Additionally, the controller ensures a seamless switching mode transition across the entire output voltage range.

The advanced Renesas R3™ technology enhances performance by enabling highly efficient light-load operation, fast transient response, and seamless transitions between discontinuous conduction mode (DCM) and continuous conduction mode (CCM).

The RAA489300 is well-suited for applications requiring versatile input sources, such as high-power barrel adapters and USB Power Delivery (USB PD) adapters. For USB PD applications, it complies with PD specifications and supports Programmable Power Supply (PPS) and Adjustable Voltage Supply (AVS) operation. Independent control loops for input and output voltages and currents ensure precision, safety, and flexibility.

The device features passthrough mode (PTM) in both forward and reverse directions, maximizing efficiency when the input and output voltages are identical. This makes it especially suitable for applications demanding high efficiency and low power loss.

Beyond its core functionality, the RAA489300 incorporates system-level features such as isolation MOSFET control and an adjustable output voltage. Its robust protection mechanisms, including overcurrent protection (OCP), overvoltage protection (OVP), undervoltage protection (UVP), and over-temperature protection (OTP), ensure reliable and safe operation under all conditions.

The controller also supports serial communication through SMBus/I2C to allow the programming of critical parameters for tailored performance. Customizable parameters include minimum input voltage, maximum output voltage, input current limits, and output current limits, offering flexibility and adaptability for diverse applications.