Fairchild : Buck regulator offers high efficiency for DVS applications

Fairchild Semiconductor gives system design engineers a highly efficient power management solution for new Dynamic Voltage Scaling (DVS) platforms found in today’s cell phones, portable media players (PMPs) and other portable applications. The FAN5355, an 800mA/1000mA 3MHz Buck converter, has been designed with a proprietary ultra-fast architecture that consumes very low quiescent current and yet delivers ultra-fast transient response. Typical quiescent current in PFM mode is 37µA and even with this meager standby current, the FAN5355 is able to provide best-in-class 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 PWM mode.

The FAN5355 is equipped with an I2C 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 lead-free (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 Directive on the restriction of the use of certain substances (RoHS).

Price (1000, pcs.): AN5355 in MLP packaging: US $0.84. FAN5355 in WL-CSP packaging: US $0.94

Availability: Samples available now

Delivery: 8 weeks ARO

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For a datasheet in PDF format, please go to:

About Fairchild Semiconductor:

Fairchild Semiconductor (NYSE: FCS) is a global leader delivering energy-efficient power analog and power discrete solutions. Fairchild is The Power Franchise®, providing leading-edge silicon and packaging technologies, manufacturing strength and system expertise for consumer, communications, industrial, portable, computing and automotive systems. An application-driven, solution-based semiconductor supplier, Fairchild provides online design tools and design centers worldwide as part of its comprehensive Global Power ResourceSM. Please contact us on the web at

Fairchild Semiconductor
Alfred Hesener
Marketing Director Europe
Fairchild Semiconductor GmbH
Oskar-von-Miller-Str. 4e
D-82256 Fuerstenfeldbruck
Tel +49 8141 6102 143
Fax +49 8141 6102 100
Mobile +49 172 8598 143

Note: The above text is the public part of the press release obtained from the manufacturer (with minor modifications). EETimes Europe cannot be held responsible for the claims and statements made by the manufacturer. The text is intended as a supplement to the new product presentations in EETimes Europe magazine.

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