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DC/DC converter delivers accurate voltage reference

Posted: 18 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? power management? processors?

TPS54620 DC/DC converter

Texas Instruments Inc. has extended it s family of easy-to-use SWIFT power management ICs with the introduction of the single-chip, 6A, 17V step-down synchronous switcher with integrated FETs.

The high-performance TPS54620 is 60 percent smaller than competing multichip converters, resulting in a complete 6A power solution less than 195mm?one-fourth the size of a postage stamp. The 1.6MHz monolithic DC/DC converter supports input voltages from 4.5- to 17V, allowing it to manage space-constrained 5V and 12V point-of-load designs, such as a wireless base station or high-density server.

"As telecommunications designs become more dense and complex, they need more integrated, highly efficient power management devices that support a 12V power rail," said Steve Anderson, senior VP of TI's power management business unit. "We continue to develop smaller, more robust SWIFT converters, so designers can more quickly develop differentiated products for the market."

In addition to size improvements, the TPS54620 offers a high degree of performance and reliability, such as a highly accurate voltage reference with 1 percent accuracy over temperature. Achieving a 95 percent power conversion efficiency and a 25 percent lower Rds(on) than previous 6A SWIFT devices, the converter easily powers deep sub-micron TI DSPs and other embedded processors such as FPGAs and ASICs.

The SWIFT device also supports a 6A continuous, 8A peak load current and a power stage input voltage range from 1.6V to 17V. The 1.6MHz synchronous converter integrates two high-efficiency MOSFETs (26m? and 19m?) and comes in a space-saving, thermally enhanced 3.5mm x 3.5mm monolithic QFN package that minimizes footprint. In addition, synchronized switching frequency from a master clock eliminates beat noise in sensitive data acquisition circuitry. The feature-rich IC also includes power-good, enable and tracking pins for sequencing.

TI provides the broadest range of step-down converters in the industry, including its SWIFT and discrete DC/DC converters. In addition to the TPS54620, TI recently introduced its new TPS54418 4A switcher with integrated FETs, which supports input voltages from 2.95V to 6V. The device switches up to 2MHz, can be synchronized and achieve greater than 95-percent power efficiency in a small 3mm x 3mm QFN package.

The TPS54620 is available in volume now from TI and its authorized distributors in a 3.5 mm x 3.5 mm QFN package. Suggested resale pricing is $1.95 in 1,000-unit quantities. The TPS54418 has a suggested resale price of $2.15 in 1,000-unit quantities.

- Henri Arnold
EE Times Europe





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