BD9533EKN is a switching regulator controller with high output current which can achieve low output voltage (0.7V to 2.0V) from a wide input voltage range (4.5V to 28V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H3RegTM is a Rohm proprietary control method to realize ultra high transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. For protection and ease of use, the soft start function, variable frequency function, short circuit protection function with timer latch, over voltage protection function and REF synchronous function are all built in. This switching regulator is specially designed for the DDR-SDRAM core.
The BD9533EKN is a switching regulator controller designed for DDR‑SDRAM cores. It operates from a wide input voltage range (4.5 V – 28 V) and provides low output voltages (0.7 V – 2.0 V) with high efficiency using an external N‑MOSFET. The device incorporates ROHM’s H’Reg™ control method, Simple Light Load Mode (SLLM), and multiple protection features.
The document includes absolute ratings, electrical characteristics, pin descriptions, block diagram, ordering information, and application notes for use in laptops, desktops, LCD‑TVs and other electronic equipment.