MIC5323-1.8YD5-TR: Powering Noise-Sensitive Applications with 1.8V Precision

In the realm of modern electronics, particularly for RF circuits, high-fidelity audio, and precision data converters, clean and stable power is not a luxury—it is an absolute necessity. The MIC5323-1.8YD5-TR from Microchip Technology stands out as a premier solution designed specifically for these demanding applications. This ultra-low-noise LDO (Low-Dropout) voltage regulator delivers a fixed 1.8V output at up to 500mA of continuous current, setting a high bar for performance in power management.

The defining characteristic of the MIC5323 is its exceptionally low output noise performance of 30µVRMS (10Hz to 100kHz). This ultra-quiet operation is crucial for powering sensitive load circuits like voltage-controlled oscillators (VCOs), LNAs (Low-Noise Amplifiers), and analog-to-digital converters (ADCs), where even minor power supply perturbations can drastically degrade signal integrity and overall system performance.

Beyond its noise performance, this regulator excels in power supply rejection ratio (PSRR), achieving greater than 70dB at 1kHz. This high PSRR effectively blocks unwanted AC ripple and noise from upstream switching regulators or other noisy power sources, ensuring that the clean 1.8V output remains uncontaminated. The device also features a low dropout voltage, enabling it to continue regulating its output even when the input voltage is very close to 1.8V, which is essential for maximizing battery life in portable devices.

Housed in a space-saving, thermally enhanced 1.5mm x 1.0mm 5-pin μDFN package, the MIC5323-1.8YD5-TR is ideal for compact, portable electronics such as smartphones, tablets, and IoT modules. Its full suite of protection features, including internal current limit and thermal shutdown, ensures robust and reliable operation under fault conditions.

ICGOOODFIND: The MIC5323-1.8YD5-TR is an exceptional ultra-low-noise LDO that provides a critical blend of high current output, outstanding noise performance, and excellent PSRR. It is the optimal choice for designers who need to ensure pristine power delivery for the most sensitive components in their systems.

Keywords: Ultra-Low-Noise LDO, 1.8V Output Voltage, 500mA Output Current, High PSRR, μDFN Package.