MIC5239-3.3YMM-TR: A 150mA Low-Dropout Linear Voltage Regulator with High PSRR

In the realm of modern electronic design, the demand for clean, stable, and noise-free power is paramount. Sensitive components like RF transceivers, precision sensors, and audio codecs require a power supply that is immune to the noise and ripple inherent in system power rails. The MIC5239-3.3YMM-TR from Microchip Technology stands out as a premier solution, expertly engineered to meet this critical need. This 150mA low-dropout (LDO) linear voltage regulator combines robust performance with a compact form factor, making it an ideal choice for a vast array of portable and noise-sensitive applications.

At its core, the MIC5239-3.3YMM-TR is designed to provide a fixed, precisely regulated 3.3V output from an input voltage range of 2.7V to 16V. Its defining characteristic is its remarkably low dropout voltage. With a dropout of just 115mV at 50mA and 270mV at the full 150mA load, the regulator can maintain stable operation even as the input voltage dips very close to the output level. This efficiency is crucial for maximizing battery life in portable devices, allowing the system to utilize almost every last bit of available energy.

However, the most significant feature of this LDO is its exceptional Power Supply Rejection Ratio (PSRR). PSRR measures an LDO's ability to reject noise and ripple from its input, preventing it from propagating to the sensitive output. The MIC5239 boasts an impressive PSRR of 70dB at 1kHz, which remains exceptionally high—above 50dB—even at frequencies up to 100kHz. This high PSRR acts as a powerful filter, ensuring that noise from switching regulators, digital circuitry, or other noisy elements on the input rail is effectively attenuated, resulting in an ultra-clean output voltage.

Beyond its electrical prowess, the device is packaged in a space-saving 1.23mm x 1.23mm 4-bump DSN package (YMM), which is critical for today's miniaturized PCB designs. It also incorporates essential protection features such as current limiting and thermal shutdown, safeguarding both the regulator and the load it powers under fault conditions. Its low ground current and fast transient response further enhance its performance profile, making it a comprehensive power management solution.

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In summary, the MIC5239-3.3YMM-TR is a high-performance LDO that excels where power integrity is non-negotiable. Its combination of high PSRR, low dropout voltage, and a 150mA output current capacity in a miniature package makes it an indispensable component for powering sensitive circuitry in applications ranging from medical devices and IoT modules to consumer audio and industrial equipment.

Keywords:

1. Low-Dropout (LDO) Regulator

2. High PSRR

3. 150mA Output Current

4. 3.3V Fixed Output

5. Noise Filtering