MIC5309-1.2YD6-TR: Powering Noise-Sensitive Applications with 300mA of Ultra-Clean Voltage

In the realm of modern electronics, the integrity of power supplied to sensitive circuits is paramount. Noise, ripple, and fluctuations on the power rail can severely degrade the performance of RF transceivers, precision analog-to-digital converters (ADCs), medical instrumentation, and audio processing chips. For these applications, a standard voltage regulator is insufficient. This is where specialized components like the MIC5309-1.2YD6-TR excel, providing a robust solution for ultra-low noise power regulation.

The MIC5309-1.2YD6-TR is a high-performance, 300mA low-dropout (LDO) voltage regulator from Microchip Technology. Its defining characteristic is its exceptionally low output noise, typically measuring a mere 30µVRMS over a 10Hz to 100kHz bandwidth. This is achieved through an innovative architecture that minimizes internal noise generation, ensuring the output voltage is exceptionally "clean" and stable. Furthermore, it boasts an outstanding power supply rejection ratio (PSRR) of 75dB at 1kHz. This high PSRR means the regulator effectively blocks noise and ripple coming from the input power source, such as a switching regulator upstream, preventing it from passing through to the sensitive load.

Despite its tiny 1.0mm x 1.0mm DFN-6 package, the MIC5309 delivers impressive performance. It features a very low dropout voltage of only 120mV at 150mA load, enhancing power efficiency and allowing it to remain in regulation even as the input voltage dips close to the output level. The fixed 1.2V output version (-1.2YD6-TR) is ideal for powering core voltages of low-power FPGAs, DSPs, and modern microprocessors. The device also includes crucial protection features like current limiting and thermal shutdown, safeguarding both the regulator and the system it powers.

Designing with the MIC5309 is straightforward. It remains stable with a small, space-saving 1.0µF ceramic output capacitor, making it an excellent choice for compact, portable consumer electronics. Its high accuracy (±1.5%) and low ground current make it equally suitable for battery-powered devices where stable voltage and long life are critical.

ICGOOFind: The MIC5309-1.2YD6-TR stands out as a premier solution for applications demanding ultra-low noise and high PSRR. Its combination of miniature size, robust 300mA output current, and exceptional noise performance makes it an indispensable component for designers aiming to achieve the highest possible performance from their noise-sensitive circuitry.

Keywords: Ultra-Low Noise LDO, High PSRR, 300mA Regulator, Precision Voltage Regulation, MIC5309-1.2YD6-TR.