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DC/DC converter offers fast response for CE

Posted: 19 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? consumer electronics? LCD?

MB39A145 DC/DC converter

Fujitsu Microelectronics Ltd debuts a new two-channel DC/DC converter IC with fast transient response for use in digital consumer products such as LCD TVs and DVRs.

The MB39A145 converter uses a "bottom detection comparator method" and includes new enhanced circuits which provide changes in voltage, for changes in current to realize a more stable and low ripple output voltage. This improved stability reduces the number of external components that are needed, thus reducing space. The IC also includes pulse frequency modulation (PFM) that is highly efficient in low-current ranges, and allows the equipment to have low power consumption in stand-by mode.

Today's consumer AV equipment, such as LCD TVs and digital video recorders, have increasingly larger screens, come with multiple functions and use advanced video compression technologies. These are supported by ICs required to provide high-speed and multi-functionality. To supply power to those ICs, power supplies must handle the requirements of large currents and fast transient response.

To meet these needs, Fujitsu Microelectronics has been providing DC/DC converter ICs that use a "bottom detection comparator method" to give fast transient response to rapid changes in output current. This new IC enhances some of the comparator circuits, to provide even greater stability in output voltage. Also, for low current ranges below 100mA, the use of PFM reduces the power consumption in stand-by mode.

The MB39A145 chip is jointly developed by Fujitsu Microelectronics and Fujitsu VLSI Ltd. Samples will be available in January 2010, at a sample price of JPY 200 ($2.24).

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