ROHM designed the buck DC-DC converter IC with built-in MOSFET (switching regulator), BD9S402MUF-C, for automotive applications covering infotainment and ADAS, including onboard sensors and cameras that are becoming more advanced.
The new device supports output voltages down to 0.6V and 4A output current at switching frequencies higher than 2MHz in a compact size needed by increasingly sophisticated secondary power supply applications for high-performance MCUs and SoCs. Also, it incorporates proprietary QuiCur high-speed load response technology and allows stable operation at an industry-leading 30mV (measurement conditions: 5V input voltage, 1.2V output voltage, 44µF output capacitance, load current variation 0 to 2A/2µs). This translates to a 25% decrease in output voltage fluctuation over class-leading standard products with equivalent functionality, making it excellent for usage in the latest ADAS with severe power supply conditions demanding stable operation within 5% even with low voltage output.
The device is also provided with a new load response performance selection function that enables users to easily switch priority between ‘voltage fluctuation’ (for industry-leading stable operation) and ‘capacitance reduction’ (to ensure stable operation at 22µF) through terminal setting. The result is that users can greatly reduce the resources needed for power circuit design, as stable operation can easily achieve not only at the initial design but also through specification or model changes.
The device, as well as meeting the basic necessities of secondary DC-DC converter ICs in ADAS for 2MHz or higher operation and 4A output current, its unique Nano Pulse Control ultra-high-speed pulse control technology provides next-generation low voltage output down to 0.6V – far lower than the typical 1V voltage output needed by current SoCs and MCUs. At the same time, equipped QuiCur high-speed load response technology accomplishes extremely stable operation. The capability to suppress voltage output variation within 5% even at low output voltages below 1V makes it excellent for secondary power supplies for the latest ADAS.