ROHM Semiconductor has released the BD9S402MUF-C, a new buck-boost DC-DC converter evaluation board designed to support automotive applications. According to the company, the board simplifies the development of power supply circuits for infotainment systems and advanced driver-assistance systems (ADAS) by providing a stable output voltage despite fluctuations in input power.
Technical Specifications and Performance
The evaluation board centers on the BD9S402MUF-C, an automotive-grade DC-DC converter that utilizes a buck-boost topology. Unlike standard buck converters that only step down voltage, this architecture allows the device to maintain a constant output even when the input voltage drops below the required output level—a common occurrence during engine cranking in vehicles.
According to ROHM’s technical documentation, the device operates with a wide input voltage range of 2.7V to 36V. The evaluation board is configured to demonstrate the chip’s ability to transition smoothly between buck and boost modes, maintaining efficiency across varying load conditions. The board includes integrated circuitry to mitigate electromagnetic interference (EMI), a critical requirement for automotive electronic control units (ECUs) that must comply with strict CISPR 25 standards.
Integration in Automotive Systems
Modern automotive architectures increasingly rely on stable power rails for sensors and processors. The BD9S402MUF-C is AEC-Q100 qualified, meaning it has passed rigorous stress tests for reliability in harsh automotive environments.
The evaluation board provides engineers with a pre-configured platform to test:
- Voltage Stability: Performance during transient input conditions.
- Thermal Management: Heat dissipation under high-current loads.
- Efficiency: Power conversion rates at different switching frequencies.
By using this board, developers can bypass the initial breadboarding phase, accelerating the transition from prototype to production. The layout is optimized to minimize parasitic inductance, which helps in achieving the low-noise performance required for sensitive automotive communication buses.
Availability and Development Support
ROHM has made the evaluation board available through global distribution channels. The company provides a suite of supporting documentation, including schematic diagrams, bill of materials (BOM), and layout guidelines, to assist hardware engineers in integrating the converter into final product designs.
For designers looking to compare this solution with prior generations, the BD9S402MUF-C offers a smaller footprint compared to discrete buck-boost controller designs. The integration of high-side and low-side MOSFETs into a single package reduces the total component count, which is a primary concern for space-constrained automotive modules.
Summary of Key Features
- Input Voltage Range: 2.7V to 36V for flexible power rail management.
- Automotive Compliance: AEC-Q100 qualified for high-reliability applications.
- Topology: Buck-boost configuration for stable output during voltage dips.
- EMI Mitigation: Designed to meet CISPR 25 automotive noise standards.
- Application Focus: Suitable for ADAS sensors, infotainment displays, and camera modules.
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