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Keywords: automobile radio head unit, auto power management, automotive power controller
APPLICATION NOTE 5837
AUTO RADIO HEAD UNITS: MORE DEMANDS,
HARSH ENVIRONMENT DRIVE NEED FOR
SOPHISTICATED POWER-MANAGEMENT ICS
By: Dan Dempsey, Executive Director
Abstract: Two integrated regulators are optimized for automotive design in the radio head unit. They offer
superior voltage, temperature, and EMI performance. The MAX16993 provides one high-voltage and two
low-voltage outputs; and the MAX16930 provides two high-voltage outputs supported by a preboost.
Introduction
While in-cabin automotive data and display get much of the attention, behind-the-scenes power
management is vital to achieving reliable, effective operation.
Key Points:
The automobile “radio head unit” in the console and instrument cluster is an increasingly crowded
place supporting many electronic functions.
Providing the various required DC power rails is a difficult challenge, with most designers resorting to a
complicated, diverse mix of regulators.
Ensuring that these regulators meet the stringent requirements for electrical, thermal, and EMI
performance (voltage load dumps and transients, wide-temperature operation, and low noise
generation) is a major design challenge.
Maxim offers two integrated regulators optimized for automotive design, with superior voltage,
temperature, and EMI performance: the MAX16993, providing one high-voltage and two low-voltage
outputs; and the MAX16930, providing two high-voltage outputs supported by a preboost regulator.
There’s a large element of irony in the design of today’s cars. They are increasingly energy efficient, yet
they also have many more electrical demands being placed on them. These demands range from an array
of safety-related functions to numerous in-cabin convenience, connectivity, and entertainment features,
such as basic AM/FM radio, satellite radio, multimedia systems interface, GPS, cellular support,
Bluetooth
, Internet/Wi-Fi , and much more.
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