ROHM developed the buck DC/DC converter IC with built-in MOSFET (Switching regulator), BD9S402MUF-C, for automotive applications such as infotainment and ADAS (Advanced Driver Assistance Systems) incorporating onboard sensors and cameras that are becoming more advanced.
The new BD9S402MUF-C supports output voltages down to 0.6V and 4A output current at switching frequencies higher than 2MHz in a compact size demanded by increasingly sophisticated secondary power supply applications for high performance MCUs and SoCs. What’s more, it is incorporating proprietary QuiCur™ (‘Quick Current’ high-speed load response circuit) high-speed load response technology and enables 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% reduction in output voltage fluctuation over class-leading standard products with equivalent functionality, making it ideal for use in the latest ADAS with severe power supply conditions requiring stable operation within 5% even with low voltage output.
The BD9S402MUF-C is also equipped with a new load response performance selection function that allows users to easily switch priority between ‘voltage fluctuation’, and ‘capacitance reduction’ (to ensure stable operation at 22μF) via terminal setting. The result is that users can significantly reduce the resources required for power circuit design, as stable operation can be easily achieved not only at the initial design, but also during specification or model changes.
| Application Examples |
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| ADAS ECU, sensors, cameras, and radars Communication systems including wireless modules and gateways Infotainment systems such as clusters and head-up displays (HUDs) Along with secondary power supplies in automotive applications that employ high-performance SoCs, MCUs, and DDR memory, etc. |
