Rohm BD9S

BD9S series of automotive secondary buck DC/DC converters for assisted driving systems, which are requiring high reliability and low power consumption in a compact form factor, such as radars, cameras, and sensors used in ADAS.

Key features

• Enable control and Output voltage indicator to improve system reliability
  These IC’s includes an enable function to adjust the startup time and a built-in output (Power Good function) indicating correct output voltage.


• Class-leading miniaturization and efficiency
  For automotive-grade secondary buck DC/DC converters requiring greater miniaturization and high performance operation, a class-leading 2mm² size with full synchronous operation is offered, while the optimized design ensures the best-in-class* power conversion efficiency among functionally equivalent products (90% at 3.6V input/1.8V output).
  The current mode control loop with fixed 2.2MHz frequency fluctuations makes it possible to reduce the size of peripheral components and eliminate interference from the AM radio band. A dedicated light load mode improves efficiency in the lower current load region. The result is higher miniaturization and power savings in safe driving support modules.


• Broad lineup includes output currents up to 4.0A
  ROHM offers ultra-compact models in output currents ranging from 0.6A to 4.0A. This contributes to model optimization and supports sudden system changes

^{**BD9S110NUX-C and BD9S111NUX-C are under development}

Applications

• ADAS sensors, cameras, and radars
• Drive recorders
• Other automotive applications requiring high efficiency, superior reliability, and greater compactness

Block diagram