esigning power solutions for automotive applications requires special care of several conditions that are
specific for automotive environment: The very wide operating temperature range, input voltage fluctuations
and stringent requirements on EMI/noise generation due to the nearby car radio receiver. Therefore, automotive
applications require high reliability and good safety protections. Richtek has launched robust automotive products
and design tools that simplify the automotive power design considerably.
Richtek Automotive Power Solutions
Richtek provides a wide range automotive solutions from DC/DC converters, LDOs, power switch, LED drivers,
PMICs to USB PD products for the variety of automotive/industrial applications. Featuring input operating voltage
up to 40V and output current up to 4A (converter), Richtek automotive products with high performance and
reliability in effectively thermal packages have successfully been selected by automotive manufacturers worldwide.
Product Quality
Richtek offers both AEC-Q100 Grade 1, 2 & 3 qualified and automotive/industrial standard products for automotive
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applications. Based on AEC-Q100 guidelines, products which meet AEC-Q100 qualification are clearly designated in Richtek product datasheets and
marked as Grade 3 operating from -40˚C to 85˚C, Grade 2 operating from -40˚C to 105˚C and Grade 1 operating from -40˚C to 125˚C.
AEC-Q100 is a failure mechanism based stress test for automotive packaged integrated circuits. It was defined by major automotive manufacturers as a
common part-qualification.
Wide ranges of automotive power ICs from Richtek in different applications
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Infotainment: Controller operating panel (HMI) and display, head-up display, head unit, Audio, Video, navigation (AVN) and others.
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Advanced Driver Assistance Systems: Multi-camera system with central processing (AVM), mmWave radar, rear and front camera, and others.
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Others including Power Switch, LED lighting, USB PD solutions and so on.
Automotive Design Considerations
Richtek automotive products are defined as two major categories for different applications: products with input voltage up to 6V and input voltage up to
40V.
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Products connected to the vehicle battery rails require 36V input voltage to support load dump and down to 4.5V for start-stop. The output voltages
of systems normally range from 1.8V to 5V. In some cases such as cold-crank where battery rail can drop as low as 3V during cranking of the engine,
it is not possible to maintain regulation when input voltage approaches the regulated voltage, and some voltage drop is allowed.
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Devices for vehicle interface processors in subsystems require input voltage up to 5.5V. The vehicle subsystem monitors temperature, voltage levels,
etc.
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A radio receiver nearby has high sensitivity in electromagnetic fields in its operating bands, and will easily be affected by converter switch noise.
Selecting a suitable switching frequency can help to avoid radiating noise in sensitive frequency bands. Richtek provides products with programmable
switching frequency, which allows best trade-off between efficiency and component size. Some products with external clock synchronization can be
set to avoid sensitive frequency bands and shift the second harmonic out of the tuned frequency band.
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Richtek also provides products with the low quiescent and low shutdown current, which is ideal for devices in standby mode.
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