Recently, MPS CoreSys (NASDAQ code: MPWR) has released a new generation of automotive-grade power management integrated circuit (PMIC) - MPQ70340FS-AEC1. This product is developed based on the MPsafeTM functional safety development process and complies with the ISO 26262 ASIL-B hardware standard. It has also passed the AEC-Q100 Grade 1 certification. Integrating three high-efficiency synchronous buck converters and one low-noise LDO, MPQ70340FS-AEC1 supports a maximum input voltage of 40V. It provides a highly integrated and highly reliable power management solution for applications such as vehicle cameras, driver monitoring systems (DMS), and in-cabin sensors. 

With the rapid development of ADAS and intelligent cabins, automotive perception systems have raised higher requirements for the number of cameras, image quality and real-time processing capabilities. This undoubtedly poses a challenge for traditional solutions. In the new generation of vehicle vision systems, the integration degree of SoC, MCU, ISP and high-resolution CMOS image sensors is constantly increasing. Along with the requirement for miniaturized structure space, the module often needs to provide multiple voltage rails such as 1.8V, 1.2V, 2.8V, 3.3V, etc. within the module, and has strict requirements for startup timing, power ripple, EMI performance and thermal design. The traditional discrete power supply solution not only occupies a large PCB area but also has a complex system design and high difficulty in EMI debugging. The highly integrated PMIC is gradually becoming an important development direction for the power architecture of automotive cameras. MPQ70340FS-AEC1 is precisely a high-performance automotive-grade PMIC product designed to address these trends. It supports battery-powered architecture and provides engineers with flexible solution design options. 

High-efficiency wide-input architecture, covering various vehicle power supply scenarios

The current power supply methods for automotive cameras are diverse. DMS, OMS, and some cabin sensor system solutions are increasingly adopting power supply from the vehicle's 12V battery. However, this requires the PMIC to be able to adapt to complex conditions such as cold start, battery fluctuations, and Load Dump. Therefore, the camera PMIC not only needs to have a wide input range but also needs to maintain high conversion efficiency and good parameter performance under high-voltage input conditions. 

MPQ70340FS-AEC1 supports a maximum input voltage of 40V, with two Buck circuits supporting an input range of 3.5V to 36V. The product adopts a two-stage 36V buck architecture, enabling higher efficiency under high-voltage input conditions. It is particularly suitable for low-voltage power rails such as 1.8V CMOS image sensor I/O, optimizing thermal performance while reducing power consumption. 

For the currently rapidly popularized 8-megapixel or higher resolution cameras, the power consumption of image sensors and ISP is continuously increasing, and the thermal management pressure has significantly risen. MPQ70340FS-AEC1 optimizes the power conversion path to reduce the system power consumption while improving the thermal performance of the module. This can help customers enhance the long-term operational stability and reduce the pressure of heat dissipation design. 

Low-noise high-frequency design, meeting strict automotive-grade EMC requirements

In the automotive vision system, power noise directly affects the output quality of the CMOS image sensor, thereby impacting image recognition, target detection, and the stability of ADAS algorithms. Therefore, EMI performance has become one of the core indicators in the design of camera PMICs. 

In response to the stringent EMC/EMI requirements for vehicle-mounted electronics, the MPQ70340FS-AEC1 adopts the MeshConnectTM Flip-Chip Package and a symmetrical layout, which reduces parasitic parameters while minimizing noise interference. The fixed 2.2 MHz switching frequency can reduce the peripheral inductors and output voltage ripple, helping to meet the CISPR 25 Class 5 standard requirements and providing support for the stable operation of the image link. At the same time, the device adopts a constant conduction time (COT) control architecture with a phase-locked loop (PLL), which can achieve rapid transient response in dynamic load change scenarios, ensuring power supply stability while also considering the overall EMI performance.