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New Fujitsu 6MHz Buck-Boost DC/DC Converter Extends Mobile Device Battery Life with Minimum Footprint

SUNNYVALE, Calif. Feb. 3, 2011 http://www.mobileworldcongress.com February 14-17 June 2011

The Fujitsu MB39C326 PMIC is designed to power the radio frequency power amplifiers (RFPAs) in mobile handsets and other mobile products that use a single-cell Li-ion battery. The converter switches at 6MHz compared with the 2 to 3MHz or lower switching rates of conventional converters, enabling designers to use a smaller inductor. The result is a reduction of up to 50 percent in the overall board space of the power management circuits.

The buck-boost functionality of the Fujitsu MB39C326 PMIC prolongs battery life and efficiency. When a Li-ion battery is fully charged, it starts with a high operating voltage. As the Li-ion battery is discharged, its operating voltage declines to the point at which the battery cannot provide sufficient power to its host device even if some charge remains. The MB39C326 switches automatically between a buck operation (stepping down the voltage) when the battery is fully charged and a boost operation (stepping up the voltage) as the battery is discharged, which maximizes the battery’s overall operating voltage and provides a stable power supply to the power amplifier. The result is a more consistent voltage level and a mobile device that can operate longer on a single charge.  

Akio Nezu

The Fujitsu MB39C326 PMIC provides up to 800mA of output current over an input voltage range of 3.1V to 4.6V. The device features a built-in, internal, field-effect transistor (FET); over-temperature protection; and an input-under-voltage lockout. The MB39C326 is available in a 20-pin, 0.4mm-ball-pitch, 2.15mm x 1.94mm WL-CSP (wafer level chip size) package.

About Fujitsu Semiconductor America, Inc.

South America

Sunnyvale, California Japan Japan Asia Europe

http://us.fujitsu.com/micro/power , [email protected]

Reference Material

http://www.fujitsu.com/downloads/MICRO/fma/pdf/MB39C326_PMIC_FS_Web.pdf

Company and product names mentioned herein are trademarks or registered trademarks of their respective companies. Information provided in this press release is accurate at time of publication and subject to change without advance notice.

SOURCE Fujitsu Semiconductor America, Inc.

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