Buck controller for USB-C power boosts performance, cuts size
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Renesas Electronics has introduced the RAA489300/RAA489301 high-performance buck controller, designed with a three-level buck topology for battery charging and voltage regulation in USB-C systems. These include multiple-port USB-PD chargers, portable power stations, PC docking stations, robots, drones, and other applications requiring a high-efficiency DC/DC controller.
The three-level buck converter topology delivers exceptional efficiency and significantly reduces the required inductance for regulating the output voltage. Its innovative design minimises power loss and reduces system size, making it ideal for compact, high-performance applications.
The three-level topology consists of two additional switches and a flying capacitor compared to a conventional two-level buck converter. The flying capacitor reduces voltage stress on the switches, allowing designers to use lower voltage FETs with better figures of merit. The result is reduced conduction and switching losses. This topology also enables the use of a smaller inductor with a peak-to-peak ripple of only about 25 percent of that of a two-level converter, enabling reduced inductor core and direct current resistance losses.
“This three-level buck controller topology is a prime example of Renesas’ worldwide leadership in battery charging,” said Gaurang Shah, Vice President of the Power Division at Renesas. “The innovative technology includes patent-pending breakthroughs that offer our customers clear advantages over competing USB-C power offerings.”
The 3-Level DC-DC RAA489300/RAA489301 battery charger and voltage regulator offers superior thermal performance, which reduces cooling requirements and results in cost and space savings. This innovative approach addresses the growing demand for compact and efficient power management systems.
The RAA489300/RAA489301 battery charger and voltage regulator offer a wide range of input and output voltages for use in voltage battery packs and with various PD adapters. The buck controller has integrated safety features with built-in protection mechanisms against overcharging, overheating, and voltage anomalies. Scalability ensures easy adaptation to multiple power levels and application requirements. An optimised switching architecture divides the voltage across power switches, improving efficiency. Lower power consumption contributes to greener, more sustainable designs, while lower thermal stress enhances system reliability and extends product lifespan.
Renesas offers the RTK-251-SinkCharger-240W and the 240W Dual-Port Daughter Card Winning Combinations that minimise the effort required for customers to design USB-C battery charging into their products.
The RAA489300/RAA489301 is available today in a 4×4 mm 32-lead TQFN package. Comprehensive design support and tools, including the RTK-251-SinkCharger-240W Kit and the RTKA489300DE0000BU Evaluation Board, are also available.
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