Power Electronics

Step-Down Regulators Combine Density, Efficiency

TEXAS INSTRUMENTS Incorporated (TI) introduced the industry's smallest, most efficient step-down regulators with integrated FETs to support up to 25 A for telecommunications, networking and other applications. The easy-to-use, 25-A, 14-V, TPS56221 synchronous SWIFT switcher with integrated NexFET MOSFETs achieves a power density greater than 200 W/in3 with greater than 90-percent efficiency at high loads from a 12-V input to a 1.3-V output, delivering up to 25 A of continuous output current at 500-kHz switching frequency. The new TPS56121 15-A, 14-V synchronous switcher is three percent more efficient at 5-V input to 1.2-V output and switches twice as fast as similar 15-A products in the market.

TI says that board-mounted power supplies are typically packed with circuitry and require greater power density and power efficiency - especially those systems operating at higher currents. These two new products expand our SWIFT family into higher current applications and allow users to achieve breakthroughs in power density, efficiency and thermal management - and ultimately more energy-efficient and reliable end equipment.

The TPS56221 and TPS56121 come in a thermally enhanced 5-mm × 6-mm QFN package, and achieve a total solution size of 315 mm2 — 30-percent smaller than other discrete solutions. Both devices are the first switchers to integrate TI's NexFET technology, providing increased thermal performance, protection, efficiency and reliability. The switchers offer three selectable frequencies of 300 kHz, 500 kHz and 1 MHz for design flexibility and support input voltages of 4.5 V to 14 V.

Texas Instruments Inc.
Dallas, TX


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