Step-down regulators offer highest power density, efficiency in smallest package
March 08, 2011 // Paul Buckley
Texas Instruments Incorporated has introduced at the 2011 Applied Power Electronics Conference (APEC) what the company claims is 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.
The TPS56221 and TPS56121 come in a thermally enhanced 5-mm x 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.
Key features and benefits of the TPS56221 and TPS56121 include:
- High-current performance and efficiency: Provides greater than 90-percent efficiency at 25-A and 15-A peak-load currents from an input voltage range from 4.5 V to 14 V
- Small size and greater power density: Total solution size of 315 mm2 minimizes footprint, while achieving a power density greater than 200W/in3
Availability and Pricing
The TPS56221 and TPS56121 come in an easy-to-solder, 22-pin, 5-mm x 6-mm QFN package with a single PowerPad thermal pad. Samples and evaluation modules are expected at the end of March 2010. Suggested resale pricing for the TPS56221 is $5.25 and the TPS56121 is $4.35 in 1,000-unit quantities.
TI's booth at APEC (#608) is hosting a live demonstration of the new device.
More information about the TPS56221 step-down regulator
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