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Buck regulator touts highest efficiency for DVS apps

Posted: 21 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? buck converter? power management? DVS application?

Fairchild Semiconductor has developed a highly efficient power management solution for new dynamic voltage scaling (DVS) platforms found in cellphones, portable media players and other portable applications.

The FAN5355, an 800mA/1000mA 3MHz buck converter, has been designed with an ultra-fast architecture that consumes very low quiescent current and yet delivers fast transient response. Typical quiescent current in PFM mode is 37?A and even with this meager standby current, the device is able to provide high transient response, making the application more resilient to unexpected fluctuations in load. In addition, this architecture creates lower ripple during PFM mode, reducing system noise and drastically improving light load efficiency to 85 percent even at loads of only 1mA. For more moderate to heavy loads, careful optimization of the power train contributes to a conversion efficiency of more than 90 percent during pulse-width modulation mode.

In addition, the FAN5355 is equipped with an I?C interface allowing the system to dynamically adjust the digital core's power supply voltage based on the processor workload. Typical cores benefiting from DVS are application processors, graphics processors and DSPs in mobile applications. By tailoring the power supply voltage level to the processing state of the core, energy consumption is reduced leading to longer battery life. In order to maximize the effectiveness of the DVS, the FAN5355's digitally programmable output voltage has a range of 0.75V to 1.975V and can be adjusted in 12.5mV increments.

To accommodate the needs of portable applications, the FAN5355 is available in 3mm x 3mm MLP packaging and 12 bump, 0.5mm pitch WL-CSP packaging. The FAN5355 utilizes Pb-free terminals and has been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. All of Fairchild's products are designed to meet the requirements of the European Union's RoHS directive.

Samples of FAN5355 are available. Pricing for the FAN5355 is at 84 cents in 1,000-unit quantities for the MLP package and 94 cents for the WL-CSP package. Delivery is eight weeks ARO.

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