DC/DC converter IC has been developed by Rohm for ADAS 

Claimed to achieve best-in-class stable operation, the BD9S402MUF-C is a buck DC/DC converter IC with an integral MOSFET, developed by Rohm Semiconductor based on QuiCur technology.

The BD9S402MUF-C is for automotive applications such as infotainment and ADAS (advanced driver assistance systems), engine control units (ECUs), sensors, cameras and radars, communication systems including wireless modules and gateways and infotainment systems such as clusters and head-up displays (HUDs)

SoCs and microcontrollers that control ADAS incorporating onboard sensors and cameras need power supply ICs to be stable in operation, even under severe load current fluctuation conditions.

The QuiCur high-speed load response technology allows for class-leading stable operation compared with automotive secondary DC/DC converter ICs with equivalent performance, said Rohm.

The BD9S402MUF-C supports output voltages down to 0.6V and 4.0A output current at switching frequencies higher than 2.0MHz in a compact size. Stability is 30mV (measurement conditions: 5.0V input voltage, 1.2V output voltage, 44 microF output capacitance, load current variation 0 to 2.0A / two microseconds). This translates to a 25 per cent reduction in output voltage fluctuation over standard products with equivalent functionality, for use in the latest ADAS with severe power supply conditions requiring stable operation within five per cent even with low voltage output, confirmed Rohm.

The company also explained that user can set the ‘gain’ pin to ‘high’ in the case of a power supply for a high-performance SoC that needs to handle fast load fluctuations or set the gain pin to ‘low’ for a good balance between performance and capacitor cost when the power supply for a microcontroller does not need to consider high accurate voltage fluctuations. Stable operation can be achieved at initial design as well as during specification or model changes, Rohm advised.

The BD9S402MUF-C is also equipped with a new load response performance selection function that allows users to easily switch priority between voltage fluctuation (for industry-leading stable operation), and capacitance reduction (to ensure stable operation at 22 microF) via terminal setting. Users can 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, according to Rohm.

The BD9S402MUF-C also includes Rohm’s Nano Pulse Control high speed pulse control technology which delivers low voltage output down to 0.6V which is much lower than the typical 1.0V voltage output required by current SoCs and microcontrollers, said Rohm. 

The ICs are sampling now with volume production scheduled for April 2023.


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