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1A step-down power converter reduces switching noise by 99 percent

April 04, 2012 | Julien Happich | 222904395
1A step-down power converter reduces switching noise by 99 percent Texas Instruments' TPS54120 voltage regulator is designed to deliver the industry's lowest-noise 1A switching power supply without sacrificing efficiency and power performance.

The TPS54120, the first in TI’s family of QuietSupply regulators, reduces switching noise by up to 99 percent compared to other power conversion devices, claims the manufacturer. It helps maximize the performance of precision data converters and amplifiers and sensitive clock distribution circuits used in applications, such as telecommunications, test equipment, and high-end audio and video equipment. Key features and benefits of the TPS54120 include a 9 µVRMS at 100Hz to 100kHz, and 17 µVRMS at 100Hz to 1MHz. The device has a high power supply rejection ratio (PSRR) of 83 db at 10kHz, 70dB at 100kHz. It is synchronizable to an external clock from 200kHz to 1.2MHz and takes a wide input voltage range of 4.5 to 17V, while offering an adjustable output of 0.8 to 6.0V. The TPS54120 comes in a 4x4mm, 20-pin QFN or TSSOP package.


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