Selecting the Right Power Supply Regulators for Automotive Secondary Rail Applications: Page 6 of 6

June 02, 2016 //By Jerome Johnston, Intersil Corporation
Selecting the Right Power Supply Regulators for Automotive Secondary Rail Applications
Today’s car manufacturers are focusing their innovations on the sophisticated cockpit electronics that improve driver safety and the overall driving experience. More and more consumers are factoring a car’s advanced driver assistance systems (ADAS) and infotainment features into their buying decisions. These systems combine several features that require heavy-duty signal processing, such as forward-looking smart cameras for detecting and classifying objects, back-up camera electronic control units (ECUs), and head-unit center information displays, to name a few. As a result, they require higher current power supply regulation at low voltages.
package enhances verification of automotive manufacturing quality as it enables optical inspection to verify proper soldering joints as shown in Figure 7.

Figure 7. Visual close up of ISL78235 wettable flank QFN package
with reliable solder joints



Today’s growth in sophisticated cockpit electronics is requiring higher current power supply regulation at lower voltages. POL power supplies need buck regulators that generate very low voltages for GPUs and other higher current devices powered from a primary supply rail of 5V or 3.3V. System designers want to save design time by using the same POL devices across their entire vehicle line up from entry-level to luxury car models.

To achieve these goals, we’ve shown that synchronous buck regulators that use high-side P-channel MOSFETs and other architectural enhancements deliver the optimized secondary power rail solution demanded by power supply designers. With auto manufacturers driving for higher levels of innovation, they look to their semiconductor suppliers to deliver the flexible, rugged and higher performance ICs that can help them realize their system design goals.



About the author:

Jerome Johnston is an Applications Engineer with Intersil Corporation’s Central Applications team. He has more than 30 years of analog system design and applications experience, and is the recipient of 13 U.S. patents. Jerome received his BSEE from the University of Nebraska.

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