onsemi NCP500SN28T1G: Ultra-Low Noise 28V LDO Voltage Regulator

In the world of precision electronics, power integrity is paramount. Sensitive analog circuits, RF transceivers, and high-fidelity audio components demand a clean, stable voltage supply, free from the noise and ripple inherent in many power conversion systems. Addressing this critical need, the onsemi NCP500SN28T1G stands out as a high-performance, ultra-low noise linear voltage regulator designed to deliver pristine power.

This regulator is engineered to provide a fixed 28V output voltage from an input voltage up to 30V, making it an ideal solution for a wide range of applications, including industrial instrumentation, medical imaging equipment, automotive infotainment systems, and telecommunications infrastructure. Its ability to operate with a relatively low dropout voltage ensures efficient regulation even as the input voltage approaches the output level.

The defining characteristic of the NCP500SN28T1G is its exceptional noise performance. It incorporates an innovative design that achieves an ultra-low output noise level of just 8.5µVrms (typical, 10Hz to 100kHz). This remarkable feature eliminates the need for additional external filtering components that are often required with conventional LDOs, thereby saving board space and reducing the overall bill of materials. Furthermore, it offers an outstanding power supply rejection ratio (PSRR) of 70dB at 1kHz, effectively blocking unwanted noise and ripple from the input source from contaminating the regulated output.

Housed in a space-saving SC-82AB surface-mount package, this regulator is built for modern, compact PCB designs. It also integrates key protection features such as current limiting and thermal shutdown, safeguarding both the IC and the downstream circuitry under fault conditions. With a output current capability of 50mA, it is perfectly suited for powering the most noise-sensitive sub-blocks within a larger system.

ICGOODFIND: The onsemi NCP500SN28T1G is a superior choice for designers who cannot compromise on power quality. Its combination of high voltage operation, ultra-low noise, and high PSRR makes it a critical component for ensuring the peak performance of sensitive analog and RF applications.

Keywords: Ultra-Low Noise, LDO Voltage Regulator, High PSRR, 28V Output, Power Management