High-Performance Microchip MIC5309-2YMT-TR 150mA Ultra-Low Noise LDO Voltage Regulator

In the realm of modern electronics, where sensitive analog circuits coexist with digital subsystems, power integrity is paramount. Noise on the power supply rail can severely degrade the performance of components like RF transceivers, high-resolution audio codecs, precision sensors, and medical instrumentation. Addressing this critical need, the MIC5309-2YMT-TR from Microchip Technology stands out as a high-performance, ultra-low noise Low-Dropout (LDO) voltage regulator designed to deliver pristine, stable power.

Exceptional Noise Performance

The defining feature of the MIC5309 is its ultra-low output noise performance of just 12µV RMS (typical over 10Hz to 100kHz). This remarkably clean output is achieved through an advanced internal design that minimizes inherent noise generation. For the most noise-sensitive applications, an external bypass capacitor can be added to the BP (Bypass) pin, further reducing noise to an astonishing 4µV RMS. This capability makes it an ideal power source for voltage-controlled oscillators (VCOs), phase-locked loops (PLLs), and analog-to-digital converters (ADCs), where even minor power rail fluctuations can introduce errors and reduce signal fidelity.

High Accuracy and Low Dropout Voltage

The MIC5309 provides a fixed output voltage with high accuracy of ±0.5% under specified conditions, ensuring that connected circuits receive precisely the voltage they require for optimal operation. Furthermore, it features a low dropout voltage of typically 110mV at 150mA load. This allows the regulator to continue regulating its output effectively even when the input voltage dips very close to the output level, maximizing efficiency and extending battery life in portable devices.

Superior Power Supply Rejection and Stability

Another critical attribute is its excellent Power Supply Rejection Ratio (PSRR), which exceeds 70dB at 1kHz. This high PSRR means the MIC5309 effectively blocks ripple and noise originating from the upstream power supply, such as a switching regulator, preventing these disturbances from reaching the sensitive load. The regulator is also stable with a small, space-saving 1µF ceramic output capacitor, simplifying board design and reducing the overall bill of materials and footprint.

Robust Protection and Compact Package

Housed in a tiny 4-bump, 0.65-pitch WLCSP (Wafer-Level Chip-Scale Package), the MIC5309-2YMT-TR is built for compact, modern PCB designs. Despite its small size, it incorporates robust protection features including current limiting and thermal shutdown, safeguarding both the regulator itself and the downstream circuitry during fault conditions.

ICGOODFIND Summary

The Microchip MIC5309-2YMT-TR is a premier solution for applications demanding ultra-clean, stable, and reliable power. Its industry-leading combination of ultra-low noise, high PSRR, low dropout voltage, and miniature form factor makes it an indispensable component for powering the most sensitive circuits in telecommunications, audio, medical, and industrial systems.

Keywords:

Ultra-Low Noise

LDO Voltage Regulator

High PSRR

150mA Output

WLCSP Package