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Power supply for car audio slashes power use down to 65%

Posted: 01 Feb 2016     Print Version  Bookmark and Share

Keywords:ROHM  power supply  car audio  DC/DC converter  infotainment 

ROHM has introduced what it touts as a system power supply IC that features the lowest power consumption in the market. According to the company, the BD49101AEFS-M is an optimised system based on a high-efficiency DC/DC converter, minimising power usage by 65 per cent to deliver 4.66W, compared to similar products with 13.3W.

Suppressing heat generation makes it possible to adopt a surface mount package without requiring an external heat sink, simplifying thermal designs considerably while contributing to greater space savings. In addition, integrating all system power supplies required for car audio systems on a single chip, such as a USB with a cable impedance function, contributes to a lighter design load.


In recent years, along with the continued computerisation comes a greater need for reducing power consumption and improving fuel consumption in vehicles. However, at the same time the growing demand for power consumption to meet the expanding functionality of car infotainment systems (i.e. USB and Bluetooth) is becoming of increased concern. And conventional car audio system power supply ICs, although are generally easy to design, often are centred on a linear regulator that suffers from poor efficiency, reducing the operating efficiency of the entire system. In response, ROHM's DC/DC converter-based system power supply IC provides much greater efficiency, enabling support for the latest high-performance car audio systems stated the company.

1. Industry-low operating power with minimal standby current


BD49101AEFS-M product features

During normal operation

Typically, high-efficiency DC/DC converters require many external parts, leading to increased costs along with larger mounting area. In contrast, ROHM conducted a thorough review of the entire system and optimally combined a DC/DC converter and linear regulator in order to cut the dual converter design and improve efficiency while reducing costs. As a result, power consumption of the entire system during operation is reduced to industry-low levels.

During standby

In DC/DC converters, because efficiency drops when the load current deceases (i.e. during standby), the BD49101AEFS-M integrates a low-current linear regulator dedicated for continuously powering the MCU. During standby operation the IC switches from the DC/DC converter to the linear regulator, reducing quiescent current that flows when the engine is idle to 100µA (typ.).

2. Space-saving surface mount package


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