High-Performance Microchip MIC5319-3YD5-TR: 300mA Ultra-Low Noise LDO Voltage Regulator

In the realm of modern electronics, where sensitive analog circuits coexist with high-speed digital components, power integrity is paramount. Noise on the power supply rail can severely degrade the performance of RF transceivers, high-resolution audio codecs, precision sensors, and medical instrumentation. Addressing this critical need, the MIC5319-3YD5-TR from Microchip Technology stands out as a high-performance, ultra-low noise Low-Dropout (LDO) voltage regulator designed to deliver pristine, stable power.

This regulator is engineered to provide a fixed 3.3V output from an input voltage range of 2.5V to 5.5V, making it exceptionally versatile for a wide array of applications powered by lithium-ion batteries, 5V system rails, or 3.3V intermediate buses. Its core strength lies in its ability to supply up to 300mA of continuous output current with an impressively low 25µVRMS output noise (integrated from 10Hz to 100kHz). This ultra-low noise characteristic ensures that even the most noise-sensitive components receive a clean power signal, free from the disturbances that can cause signal degradation.

Furthermore, the MIC5319-3YD5-TR achieves this exceptional noise performance while maintaining high power supply rejection (PSRR). It offers a PSRR of 75dB at 1kHz, effectively filtering out ripple and noise originating from upstream switching regulators or other noisy power sources. This combination of low inherent noise and high noise rejection creates an ideal power conditioning solution for the critical load points in complex systems.

Beyond its electrical performance, the device is housed in a space-saving 1.6mm x 1.6mm 4-bump DSN package. This miniature footprint is crucial for today's compact and portable consumer electronics, Internet of Things (IoT) devices, and wearable technology, where board real estate is at a premium. Despite its small size, it incorporates key protection features such as current limiting and thermal shutdown, safeguarding both the regulator and the load under fault conditions.

Designing with the MIC5319 is notably straightforward. It requires only a small 1µF ceramic input and a 2.2µF ceramic output capacitor for stable operation, minimizing the external component count and total solution size.

ICGOODFIND: The Microchip MIC5319-3YD5-TR is a superior choice for designers who cannot compromise on power quality. Its winning combination of ultra-low noise, high PSRR, and a miniature package makes it an indispensable component for powering noise-sensitive loads in space-constrained, battery-powered applications, ensuring optimal system performance and reliability.

Keywords: Ultra-Low Noise, High PSRR, 300mA LDO, Miniature Package, Power Integrity