Power supply IC targets car audio applications, slashes power consumption

January 28, 2016 // By Julien Happich
Rohm has developed the BD49101AEFS-M, a system power supply IC that leverages the company's expertise in car audio power system design to achieve an optimized system based on a high-efficiency DC/DC converter.

As a result, power consumption is reduced by 65%, from 13.3W with the company’s previous parts to 4.66W.

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 – including for USB with a cable impedance function – contributes to a lighter design load.

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 100uA (typically). The chip comes in a compact surface-mount package with small backside heatsink. This eliminates the need for thermal counter measures and results in 14x less volume compared with conventional products.

Visit Rohm at www.rohm.com