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Step-down regulators deliver high power density in small package

Dallas, Tex. — Texas Instruments Inc. (TI) has claimed 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 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 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, according to TI.
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The TPS56221 and TPS56121 are available in a thermally enhanced 5 x 6-mm QFN package, and achieve a total solution size of 315 mm2, which TI says is 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.

Availability:The TPS56221 and TPS56121 are available in a 22-pin, 5 x 6-mm QFN package with a single PowerPad thermal pad. Samples and evaluation modules are expected at the end of March.
Pricing: $5.25 for the TPS56221 and $4.35 for the TPS56121 in quantities 1,000.
Resources: NexFET Power Block CSD86350Q5DEVM-604 evaluation module, Power Stage Designer software design tool, SWIFT DC/DC step-down converter portfolio, and NexFET power MOSFETs portfolio.