NewsROHM’s New DC/DC Converter IC for ADAS Achieves Best-in-Class-Leading Stable Operation

ROHM’s New DC/DC Converter IC for ADAS Achieves Best-in-Class-Leading Stable Operation

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Updated Product Information Online September 27, 2022 ROHM designed the buck DC/DC converter IC (Switching regulator) with built-in MOSFET. This is for automotive applications like infotainment or ADAS (Advanced Driver Assistance Systems). These systems incorporate onboard sensors and cameras which are getting more advanced. As technological advances in autonomous driving and accident prevention have made it easier to meet safety standards in the automotive industry, so has the demand for safety. SoCs and MCUs controlling ADAS with onboard sensors or cameras are becoming more sophisticated, requiring power supply ICs to ensure that they operate well under extreme load current fluctuations. ROHM created Nano Pulse Control(tm), an ultra-high speed pulse control technology, which provides low output voltage at high switching frequency. QuiCur(tm), a high-speed load response technology, was established in 2021 to meet these requirements.

QuiCur(tm), a patented technology, allows for stable operation that is class-leading compared to automotive secondary DC/DC converter ICs of comparable performance. The new BD9S402MUF–C supports output voltages below 0.6V and 4A current at switching frequencies greater than 2MHz. It is compact enough to be used in secondary power supply applications that require high-performance MCUs and SoCs. It also incorporates proprietary QuiCur(tm), high-speed load responsive technology, and allows stable operation at a industry-leading 30mV. (measurement conditions are: 5V input voltage; 1.2V output voltage; 44mF output capacitance; load current variation 0-2A/2ms). This means that the output voltage fluctuation is 25% lower than standard products of comparable functionality. It’s ideal for use with the latest ADAS, which requires stable operation within 5% even under severe power supply conditions.

The BD9S402MUF–C also features a new load performance selection function. This allows users to switch priorities between ‘voltage fluctuation (for industry-leading stable operation) and ‘capacitance decrease’ (to ensure stable operation @ 22mF). Users can reduce the amount of resources needed for power circuit design by switching between ‘voltage fluctuation’ (for industry-leading stable operation) and ‘capacitance reduction’ (to ensure stable operation at 22mF) via terminal setting. ROHM intends to expand its range of power supply ICs that incorporate QuiCur(tm), in order to support a wider variety of applications. What is QuiCur(tm?) Technology? Named after ROHM’s original Quick Current’ high speed load response circuit, QuiCur(tm), QuiCur(tm), maximizes load transient response characteristics and doesn’t cause instability in power supply IC feedback circuits. This allows for stable operation with minimal output capacitance. It also allows linear adjustment of capacitance to achieve stable operation regardless of changes in specification. For more information about QuiCur(tm), click on the URL. New Product Details The BD9S402MUF-C, in addition to meeting the basic requirements of secondary DC/DC converter ICs in ADAS for 2MHz or higher operation and 4A output current, ROHM’s unique Nano Pulse Control(tm) ultra-high-speed pulse control technology delivers next-generation low voltage output down to 0.6V – much lower than the typical 1.0V voltage output required by current SoCs and MCUs. The QuiCur(tm), high-speed load response technology, ensures that the unit is stable.

It is ideal for secondary power supplies to the latest ADAS, as it can suppress voltage output variation by 5% even at low output voltages lower than 1.0V. The BD9S402MUF–C also features a load response performance select function. This allows users to switch priorities between ‘voltage fluctuation (to ensure industry-leading stability) or ‘capacitance decrease’ (to ensure stable operation at 22mF). In the case of a power supply that is high-performance and can handle rapid load fluctuations, the GAIN pin can be set to High. The GAIN pin can be set to Low to achieve a balance between performance, cost, and reliability when an MCU’s power supply doesn’t have to account for high voltage fluctuations. This allows for greater design flexibility and ease of use by application designers. Stable operation can be achieved both at the initial design stage as well as during model or specification changes. Part No. Data Sheet Part No. Data Sheet Input Voltage [V] Output Current (Max.] For more information, click on the URL. Application Examples * 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. Pricing: $2.00/unit (samples excluding tax). Online Sales Information: Digi-Key Mouser and Farnell Online Distributors Terminology: DC/DC Converter IC (Switching Regulation) A DC/DC converter IC generates an output voltage via switching operation. A step-up topology (boost), which increases the voltage, and a step down (buck), configuration that decreases voltage are available. The primary is the side responsible for 1st-stage conversion from a power source like a battery in an automotive power supply IC. The secondary is responsible for the 2nd stage conversion. This involves the conversion of voltage from 5V/3.3V up to lower output voltages.

Load Transient Reaction Characteristics (Load response), Load current From the perspective of the power supply IC all electronic circuits in subsequent stages, including MCUs, can be considered loads’. These loads can cause the output voltage of power supply ICs to fluctuate due to a load current. The response time to voltage changes due to load current fluctuations and power supply stabilization is called the Load Transient Response Characteristics. *QuiCur(tm), Nano Pulse Control ™, are registered trademarks or trademarks of ROHM Co. Ltd. The QuiCur(tm), technology maximizes load reaction 2.2MHz Automotive SecondaryDC-DC ConverterIC (PDF:580KB). Click here to inquire about our products

Michal Pukala
Electronics and Telecommunications engineer with Electro-energetics Master degree graduation. Lightning designer experienced engineer. Currently working in IT industry.