Maxim Integrated Products rolls out five application-specific ICs for ADAS designers, focused on performance, size, efficiency, and protection

By Warren Miller, contributing writer

Advanced
driver-assistance systems (ADAS) are seemingly ubiquitous in newer-model
automobiles. ADAS functions do everything from engaging the brakes when a
collision is imminent to regulating the speed at which the cruise control is
set to optimizing the distance between your vehicle and the car in front of
you. Applications include collision avoidance, GPS/navigation, adaptive cruise
control, lane centering, lane-departure warning, and back-up/surround video.
With that in mind, Maxim Integrated Products, Inc. has recently released a new
series of power
management integrated circuits (PMICs) specifically designed for ADAS power
optimization
.

Managing DC power
in the harsh operational conditions commonly found in automotive environments
can be challenging for designers. Package size, electrical protection, and
operational efficiency all need to be optimized to ensure high performance. The
new Maxim PMIC series includes an array of devices that address the varying
needs of ADAS designers. These include the following devices:

  • The MAX20019 dual-synchronous step-down converter claims to be the smallest 3.2-MHz dual
    step-down power supply in a 2 x 3-mm package size.
  • The MAX20087 quad-camera power protector monitors as many as four 600-mA coax
    channels and can identify faults from individual cameras while an I2C
    interface reports on voltage fault conditions.
  • The
    MAX20075 and MAX20076 synchronous step-down converters boast a 91% high-peak efficiency
    rate while featuring the lowest quiescent current on the market, according to
    Maxim.
  • The MAX200014 triple-output converter provides a 2.2-MHz switching frequency
    as well as two synchronous step-down converters and a single synchronous boost
    converter, allowing for more compact and cost-effective designs compared to its
    nearest competitors, said Maxim.

(Each product link above provides access to
datasheets and ordering information.)

As seen in the graphic
below, ADAS uses multiple cameras to help drivers see and react to changes in
the environment. You can bet that the number of cameras used in ADAS is going
to increase as more applications are found that improve safety.

The MAX20087, by
delivering power over coax to up to four cameras, is well-positioned for
increased camera use in ADAS. According to the datasheet, the device can deliver
up to 600-mA load current to each output channel. Each output is individually
protected from short-to-battery, short-to-ground, and overcurrent conditions.
The device provides a convenient I2C interface to read system diagnostic
status. An on-board ADC enables reading of the current through each switch. The
ASIL B- and ASIL D-compliant versions include support for reading an additional
seven diagnostic measurements through the ADC, ensuring high-fault coverage.

Applications for Maxim PMICs in ADAS systems. Image source: Maxim.

“Designers
must meet demanding requirements along with difficult constraints, which
standard catalog parts cannot do effectively,” according to Warren Tsai,
director of business management for the Automotive Business Unit at Maxim
Integrated. “With this array of carefully tailored, application-specific ICs,
Maxim is addressing the complex and unique needs of ADAS designers.”