Low EMI automotive power designs

February 05, 2015 //By Jeff Gruetter
Low EMI automotive power designs
Jeff Gruetter, Product Marketing Engineer, Linear Technology Corporation considers low EMI automotive power design issues.


As automobiles continue to add an ever increasing number of electronic systems to enhance safety, comfort, efficiency and performance while minimizing harmful exhaust emissions, it comes as no surprise that they require physically smaller power solutions with dramatically higher power levels. Additionally, with the proliferation of more EMI-sensitive systems within the vehicle, reducing EMI emissions from switching power supplies is of paramount importance, thereby creating more challenges for switching regulator IC design.

According to Strategy Analytics, “the demand for enabling semiconductor devices is expected to grow at a CAAGR (compound average annual growth rate) of five percent per year over the next seven years, with the total market worth over $41 billion by 2021, compared to $28.9 billion in 2014. The Strategy Analytics analysis also identifies that demand for microcontroller and power semiconductors will drive over 40 percent of revenues.”
Strategy Analytics provides a very quantitative description of forecasting the growth of electronics content in automobiles, but more interesting is the prevalent role that power ICs play in this growth. These new power IC designs must offer the following:
1)      Robust performance across a wide range of voltages, including handling of transients in excess of 36V

2)         Ultralow electromagnetic interference (EMI) emissions

3)      The highest efficiency possible to minimize thermal issues and optimize battery run time.

4)      The smallest solution footprints, demanding very high power densities with switching frequencies of 2MHz or greater needed to keep the switching noise out of the AM Radio band while keeping solution footprints very small

5)      Ultralow quiescent current (<10µA) to enable always-on systems such as security, environmental control and infotainment systems to stay engaged without draining the vehicle’s battery when its engine (alternator) is switched off  
The goals for the increased performance levels of power ICs are to enable the design of increasingly complex and numerous electronic systems. Applications fueling this growth are found in every aspect of

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