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12V buck converter simplifies CE power design

Posted: 29 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:power management IC? buck converter? consumer electronics?

Texas Instruments Inc. has released the first dual-output fully synchronous SWIFT power management IC. The TPS54290 1.5-/2.5A converter simplifies power design in consumer electronics with a 12V power supply, such as a STB or DTV.

The SWIFT device operates from a 4.5V to 18V input supply voltage and supports output voltages as low as 0.8V with a 90 percent power efficiency rating. The TPS54290 is set at a fixed frequency of 300kHz. Two other family members, the TPS54291 and TPS54292, provide switching frequencies of 600kHz and 1.2MHz, respectively, further reducing the DC/DC solution size.

The dual output synchronous buck converter with four integrated MOSFETs provides fully synchronous conversion with 90 percent efficiency, while using 35 percent less board space compared to non-synchronous conversion solutions.

The device also features current mode control that simplifies external compensation, giving the designer greater flexibility when choosing different types of output capacitors.

In addition, a 180 degree out-of-phase operation minimizes ripple current through the input capacitor. Input capacitance is reduced by up to 50 percent, which helps lessen electromagnetic interference.

TPS54290, TPS54291 and TPS54292 SWIFT converters are available in volume now from TI and its authorized distributors with a suggested resale price of $2.95 in 1,000-unit quantities. Samples, evaluation modules and application notes are available.

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