In recent years, safety requirements in the automotive sector have increased as technological innovations in accident prevention and autonomous driving have continued to advance. In this regard, SoCs and MCUs that control ADAS systems equipped with onboard sensors and cameras are becoming more sophisticated, requiring integrated power supply circuits to operate more stably even under challenging conditions of fluctuating charging current.
To meet these needs, ROHM created Nano Pulse Control™ ultra-high-speed pulse control technology in 2017, which provides low output voltage at high switching frequencies. This was followed in 2021 by QuiCur™ high-speed load response technology, which ensures stable operation. ICs adopting QuiCur™ technology enable class-leading stable operation compared to equivalent-performing automotive secondary DC/DC converter ICs.
The new BD9S402MUF-C supports output voltages as low as 0.6 V and output currents of up to 4 A at switching frequencies above 2 MHz in a compact size demanded by increasingly sophisticated secondary power applications for high-performance MCUs and SoCs. It also incorporates patented QuiCur™ high-speed load response technology and enables stable operation at an industry-leading 30 mV (measurement conditions: input voltage 5 V, output voltage 1.2 V, output capacitance 44 µF, load current variation 0 to 2 A/2 µs). This translates to a 25% reduction in output voltage fluctuation compared to leading standard products with equivalent functionality, making it ideal for use in the latest ADAS with challenging power supply conditions requiring stable operation within a 5% margin, even at low output voltages.
The BD9S402MUF-C is also equipped with a new load response performance selection function that allows users to easily switch priorities between "voltage fluctuation" (for industry-leading stable operation) and "capacitance reduction" (to ensure stable operation at 22 µF) via terminal configuration. As a result, users can significantly reduce the resources required for power supply circuit design, as stable operation can be easily achieved not only in the initial design but also during model or specification changes.
In the future, ROHM plans to expand its range of power supply integrated circuits by incorporating QuiCur™ to support a wider range of applications.
New Product Details:
The BD9S402MUF-C, in addition to meeting the basic requirements of secondary DC/DC converter ICs in ADAS for 2 MHz or higher operation and 4 A output current, features ROHM's unique Nano Pulse Control™ ultra-high-speed pulse control technology, delivering a next-generation low-voltage output as low as 0.6 V – significantly lower than the typical 1.0 V output voltage required by today's SoCs and MCUs. Simultaneously, the patented QuiCur™ high-speed load response technology ensures extremely stable operation. Its ability to suppress output voltage variation within a 5% margin, even at low output voltages below 1.0 V, makes it ideal for secondary power supplies for the latest ADAS.
The BD9S402MUF-C is also equipped with a load response performance selection function that leverages QuiCur™ technology, allowing users to easily switch priorities between "voltage fluctuation" (for industry-leading stable operation) and "capacitance reduction" (to ensure stable operation at 22 µF) by adjusting the GAIN pin's High/Low setting. For example, the user can set the GAIN pin to "High" for a high-performance SoC power supply that needs to handle rapid load fluctuations.
Alternatively, the user can set the GAIN pin to "Low" for a good balance between capacitor cost and performance when the power supply for an MCU does not need to account for high-precision voltage fluctuations. This contributes to a significant increase in design flexibility for application designers, as stable operation can be easily achieved both in the initial design and during model or specification changes.
*ROHM also offers another range of secondary DC/DC converter integrated circuits.
Application examples
ECUs, sensors, cameras and radars ADAS
Communication systems including gateways and wireless modules
Infotainment systems such as instrument clusters and head-up displays (HUDs)
Along with secondary power supplies in automotive applications that employ DDR memory, MCUs, high-performance SoCs, etc.
Availability: immediate (samples), April 2023 (in mass production)
