Featuring the MIC2129 DC-DC controller, this compact, high-efficiency solution delivers up to 10A with excellent voltage regulation, scalability, and built-in protections—ideal for EVs, e-scooters, telecom supplies.
The 48V to 12V Power Conversion Reference Design is a robust, fully validated, and ready-to-use platform centered on the MIC2129 controller. Utilizing a buck converter topology, this design efficiently steps down a nominal 48V input voltage to a stable 12V output, delivering up to 10A of continuous current. It supports a broad input voltage range of 18V to 60V, making it highly adaptable to a variety of demanding power applications. The system is particularly suited for high-voltage, high-power, and high-efficiency scenarios such as those found in automotive and e-mobility sectors, including electric vehicles (EVs), e-scooters, and 2- or 3-wheeler applications.
Designed to extend battery life and ensure safe, reliable operation, the reference design integrates key protection features that help mitigate electrical faults and maintain system integrity. The architecture ensures excellent line and load regulation, maintaining consistent output voltage despite changes in input or load conditions. Additionally, the design offers low output voltage ripple and noise, which is essential for powering sensitive electronic components and systems.
The heart of this reference design is the MIC2129, a 100V DC-DC step-down controller equipped with selectable gate drive options and remote sensing capability. This component allows for precise voltage regulation and efficient switching performance. The MIC2129’s Constant On-Time (COT) control architecture enables rapid response to load transients, thereby minimizing voltage variations and enhancing overall system stability.
Key benefits of this design include its scalability to different output voltages and current requirements, making it a flexible solution for diverse power management needs. The use of MOSFET-based current sensing eliminates the need for additional components, reducing PCB footprint and cost. This efficient layout contributes to improved thermal performance and overall power efficiency.
Target applications include industrial and telecom power supplies, battery chargers, and low-power electric vehicles. The design’s adaptability and reliability make it an ideal reference for engineers developing power systems in modern transportation and industrial sectors. By offering a compact, efficient, and feature-rich solution, the 48V to 12V reference design simplifies the development process and accelerates time to market for power electronics solutions in rapidly evolving industries.
Microchip Technology has tested this reference design. It comes with a bill of materials (BOM), schematics, assembly drawing, printed circuit board (PCB) layout, and more. The company’s website has additional data about the reference design. To read more about this reference design, click here.
