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Fujitsu outs DC/DC converter for mobile devices

26 Jul 2012

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Fujitsu Semiconductor Asia Pte Ltd (FSAL) has unveiled a DC/DC converter for mobile devices, which by automatic step-up/down switching mode, its range of power supply voltage can be expanded. The MB39C326 contains an oscillation FET and adopts a small package, hence it forms a power supply system with small mounting area and low BOM cost, noted the company.

The MB39C326 is a synchronous step-up/down DC/DC converter with high efficiency and low noise. It is mainly designed for mobile devices that use a single cell Li-ion battery. This product supports APT and ET function, hence the PA operating efficiency can be greatly enhanced in 3G/4G application, and system power can be saved up to 40 percent or above. The oscillation frequency of MB39C326 is 6MHz, and a smaller inductor (0.47uH) can be applied when comparing with traditional converter with 2MHz to 3MHz, thereby the total space of PCB can be reduced by half.

In addition, step-up/down operation can be automatically switched by inputting voltage through the unique voltage step-up/down circuit. When the voltage of Li-ion batteries change, MB39C326 delivers a stable voltage and effectively extends the life of Li-ion batteries, described the company.

The device can be applied to a range of mobile devices including mobile phones, smartphones, e-book terminal and PDAs. It can also be used in products with Li-ion batteries, RF power amplifiers (PA) and RF-PC card.

The MB39C326 comes in a WL-CSP package (2.15x1.94x0.625mm), 20 pins with up to 93 percent efficiency. Its input voltage range is from 2.5V to 5.5V, while the output voltage range ranges from 0.4V to 5V. (Output voltage can be changed arbitrarily by adding a resistor to the feedback resistor of DAC signal input). The maximum output current can reach 1200mA (for voltage step-down).

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