Preface
In many applications, there is a mismatch between the supply and demand of energy, such as voltage changes, energy fluctuations, etc., and synchronous bidirectional buck-boost converter chips can solve this kind of problem, which can achieve step-up or step-down functions when the input voltage is higher or lower than the output voltage, respectively, so as to ensure a stable output voltage supply. Compared with the traditional one-way converter, the synchronous bidirectional buck-boost converter has better performance in energy feedback and energy loss, which greatly improves the energy utilization rate of the system.
Recently, Yuanxin Semiconductor has launched a new synchronous bidirectional buck-boost controller chip, Yuanxin YX2865, which can seamlessly switch between multiple buck-boost modes for the gallium nitride charger that is currently hot in the market, with a conversion efficiency of up to 98%.
Yuanxin YX2865
The YX2865 is a highly integrated synchronous bidirectional buck-boost controller IC designed to drive silicon MOSFETs or gallium nitride power transistors for efficient power conversion. The chip supports a wide input voltage range of 4V to 65V and a wide output voltage range of 2V to 65V, and can seamlessly switch between buck, buck-boost, and boost modes. The YX2865 achieves bidirectional power path conversion through the DIR pin, which is especially suitable for application scenarios that require flexible power management.
The YX2865 has a power conversion efficiency of up to 98% and supports an ultra-wide switching frequency range from 50KHz to 3MHz, which can be set via the frequency setting pin (RT). The chip provides programmable input and output current limiting and uses ISM for load current monitoring. In order to optimize the performance of the power switch, the YX2865 also has an adjustable dead time control function, which effectively reduces switching losses and further improves system efficiency.
In terms of safety and protection, the YX2865 integrates high-side and low-side gate drivers, and has UVLO protection to prevent failures caused by too low drive voltage. At the same time, YX2865 also supports external compensation, programmable soft start and other functions, effectively improving system reliability and user experience.
The YX2865 is available in 5x5mm and 4x4mm 32-pin QFN packages, making it easy for engineers to choose the right solution for their design, which can be widely used in bidirectional buck-boost DC-DC power supplies, USB Type-C power delivery, power interrupt protection systems, and industrial and automotive power supplies.
The figure shows the transition from buck-boost mode to step-up mode, and the switch node at the input end changes from switch to pass-through, showing the change of the switch waveform and inductor current waveform of the node.
The figure shows the transition from step-up mode to buck-boost mode, and the switch node at the input end changes from pass-through to switch, showing the change of the switch waveform and inductor current waveform of the node.
Summary of the charging head network
YX2865 supports a wide range of input and output voltages, and can seamlessly switch between buck, boost and buck-boost modes. Its bidirectional operation function enables bidirectional control of the power path through the DIR pin, and the power conversion efficiency is up to 98%. The ultra-wide switching frequency range and adjustable dead-time control optimize the switching timing and further improve the system efficiency. At the same time, the integrated multiple protection functions simplify the design and improve the reliability and safety of the system. YX2865 is very competitive in various application scenarios, whether it is a GaN charger, a bidirectional buck-boost DC-DC power supply, or a USB Type-C power supply and other high-demand fields, YX2865 can provide a stable and reliable power management solution.