Texas Instruments Inc. has introduced a new class of voltage regulators designed to deliver the industry's lowest-noise 1-A switching power supply. The TPS54120 reduces switching noise by up to 99 percent. The device 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 of the TPS54120

-99-percent noise reduction: 9µVRMS at 100Hz to 100kHz, and 17µVRMS at 100Hz to 1MHz

-Performance: High power supply rejection ratio (PSRR) of 83db at 10kHz, 70dB at 100kHz

-Design flexibility: Synchronizable to external clock from 200kHz to 1.2MHz

-Wide input voltage range of 4.5V to 17V, adjustable output of 0.8V to 6.0V

The TPS54120 is now available in thermally enhanced 4x4mm, 20pin QFN or TSSOP package. The suggested resale price of the device is pegged at $1.95 each in 1,000-unit quantities. The easy-to-use TPS54120EVM-103 contains all of the external components required for a low noise, 1-A solution with internal thermal and current limit shutdowns, power good output monitor, tracking and enabling/disabling circuitry.