12-V dual-channel synchronous buck converter with integrated FETs

Mar 8, 2010 11:31 AM

Texas Instruments Incorporated (TI) introduced its first dual-output fully synchronous SWIFT power management integrated circuit. The TPS54290 1.5-A/2.5-A converter simplifies power design in consumer electronics with a 12-V power supply, such as a set top box or digital TV.

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

• 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.
• Current mode control simplifies external compensation, giving the designer greater flexibility when choosing different types of output capacitors.
• 180º 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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