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DC/DC converter IC is tailor-made for ADAS applications

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By Christoph Hammerschmidt


Rohm has developed a buck DC/DC converter IC with an integrated MOSFET (switching regulator), which is said to be especially suitable for the increasingly demanding applications in vehicles due to its properties. The manufacturer cites infotainment and (Advanced Driver Assistance Systems) with integrated sensors and cameras as examples of use.

In the automotive sector, safety requirements are increasing due to technological progress in the field of accident prevention and autonomous driving. Accordingly, the SoCs and MCUs for controlling ADAS are becoming more and more powerful, which is why the power supply ICs have to operate stably even with strong load current fluctuations.

To meet these requirements, Rohm introduced the ultra-fast pulse control technology Nano Pulse Control for low output voltages at high input voltages and fast switching frequencies back in 2017. This was followed in 2021 by the high-speed load control technology QuiCur, which ensures stable operation at low output capacitance.

Romm’s new BD9S402MUF-C DC/DC converter chip uses these techniques. It supports output voltages down to 0.6 V and a maximum output current of 4 A. Its switching frequency is over 2 MHz. Its switching frequency is over 2 MHz. The IC features compact dimensions, which are demanded by the increasingly sophisticated secondary power supplies for high-performance MCUs and SoCs. Equipped with proprietary QuiCur technology, it enables stable operation at an industry-leading 30 mV voltage dip during transients of 2 A with a slew rate of 1 A/µs. This reduces output voltage fluctuations by 25% compared to class-leading standard products with equivalent functionality. The IC is therefore recommended for use in the latest ADAS with challenging power supply conditions that require stable operation within less than 5% voltage tolerance, even at low output voltage.

The BD9S402MUF-C also has a load cycling selection function. This takes advantage of the features of QuiCur technology and, by setting the GAIN pin high or low, allows the user to switch the priority between “voltage swing” (for very fast load swing responses) and “capacitance reduction” (to ensure stable operation at 22 µF). This feature greatly increases the flexibility of application designers when designing power supply circuits, as stable operation can be easily achieved both in the original design and in specification or model changes.

As examples of applications for the new chip, Rohm cites ADAS ECUs, sensors, cameras and radars; communication systems including wireless modules and gateways; and infotainment systems such as clusters and head-up displays (HUDs).

Samples of the BD9S402MUF-C are available now, with volume production starting in April 2023.

More information here


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