Voltage regulator targets automotive infotainment

MUNICH, Germany — Active antennas for car radios are the target applications for Infineon's voltage regulator chip with integrated protecting functions. The device supports most active antenna standards.

The TLF 4277 low drop out (LDO) voltage regulator has adjustable output voltage to support the majority of standard active antennas, including FM/AM, DAB, as well as XM and SIRIUS satellite radio bands. With its integrated current monitor and adjustable current limitation, the TLF 4277 enables reduction in the number of discrete components for active antenna applications by approximately 50 percent, the vendor promises.

According to Infineon, more than 95 percent of all cars now produced worldwide are equipped with active antennas for radio program reception. Active antennas are small enough to fit into the windscreen, front bumper or the stub antenna on the car's roof. According to current market researchers, about 52 to 55 million cars are expected to be produced globally in the year 2009. On average, cars are typically equipped with two active antennas and as a result with two active antenna voltage regulators, Infineon reckons.

The company claims to be the first chip supplier to produce a monolithic single-chip voltage regulator with integrated current monitor function for diagnosis and system protection as well as adjustable current limitation. The integration of these functions is expected to improve the reliability of car radios. The monitor function of the TLF 4277 allows detection of failures and integration of a failure analysis function in an infotainment system. The AEC-Q100 qualified device is protected against failure situations, such as short-circuit of the output against ground or battery voltage, over-temperature and over-current.

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