PMICs combine small size with high efficiency for automotive subsystems

PMICs combine small size with high efficiency for automotive subsystems

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By Christoph Hammerschmidt

ADAS functions, which are already mandatory today or will soon be mandatory, increase vehicle safety and improve the driving experience. These include intelligent braking functions for collision avoidance, GPS/navigation, adaptive speed control, lane keeping assistants and reversing/environment cameras. Although much attention is paid to these functions in development, the handling of power supply in electrically harsh vehicle environments is a challenge for ADAS system developers that is not so much considered but nevertheless critical.

Maxim’s application-optimized ICs regulate, control and protect the power supply. These products solve difficult problems for ADAS system designers by offering a unique combination of package size, high operating efficiency, low quiescent current, integrated ASIL B/D electrical protection and reduced EMI.

The PMIC series introduced by Maxim includes the following components:

  • The MAX20019 dual-channel synchronous down-converter: it provides the industry’s smallest dual-channel 3.2 MHz power supply with a package size of 2 mm × 3 mm (compared to the nearest competitor solutions offering single-channel components in either 2 mm x 2 mm or 3 mm x 3 mm packages).
  • MAX20087 quad camera power protection: The ASIL B/D camera module protection IC contains an I2C interface for reporting over/undervoltage and fault conditions; it monitors up to four 600 mA coaxial channels and isolates faults from individual camera modules.
  • MAX20075 and MAX20076 synchronous down-converters: They provide the industry’s lowest quiescent current with peak and valley mode current control functions; achieve a high peak efficiency of 91% when used in always-on applications while having a 40 V load-dump tolerance.
  • The MAX20014 three-output DC/DC converter: It includes one synchronous up-converter and two synchronous down-converters for smaller, simpler and more cost-effective designs (competitive products require two ICs plus discrete components); it has a switching frequency of 2.2 MHz and a spread spectrum function for reduced interference radiation and is available in a 4 mm x 4 mm small package.

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