MIC2951-02YM-TR: A 150mA Low-Dropout Voltage Regulator with Error Flag Output

In the realm of power management, ensuring a stable and reliable voltage supply is paramount for the consistent operation of electronic circuits. The MIC2951-02YM-TR from Microchip Technology stands out as a robust solution, combining the efficiency of a low-dropout (LDO) voltage regulator with the critical diagnostic capability of an error flag output. This integrated circuit is specifically engineered to deliver up to 150mA of output current while maintaining exceptional performance and protection features.

The core functionality of the MIC2951-02YM-TR is to provide a tightly regulated voltage from a higher, often noisy, input source. Its key advantage lies in its very low dropout voltage. Typically, at the full 150mA load, the dropout voltage is a mere 350mV. This high efficiency means the regulator continues to provide a stable output even as the input voltage dips very close to the output level, significantly minimizing power loss and extending battery life in portable applications.

Beyond basic regulation, this device incorporates a sophisticated error flag circuit. This output acts as an early warning system, signaling when the output voltage has fallen out of regulation by approximately 5%. This can occur under two primary conditions: first, if the input voltage sags too low (i.e., approaches the dropout region), and second, if the device goes into thermal shutdown due to excessive power dissipation. This error flag feature is invaluable for microprocessor-based systems, allowing the microcontroller to be interrupted or reset before erratic operation caused by low voltage can lead to system failures or data corruption.

The MIC2951-02YM-TR is designed for resilience. It includes built-in protection against overcurrent conditions and overtemperature scenarios. In the event of a short circuit or excessive junction temperature, the IC will shut down, safeguarding itself and the downstream components from damage. Available in a space-efficient SOT-223 package, it offers an excellent balance of power handling and board footprint, making it suitable for a wide array of applications, including battery-powered devices, smart instruments, and automotive subsystems.

ICGOOODFIND: The MIC2951-02YM-TR is a highly reliable, feature-rich LDO regulator. Its exceptionally low dropout voltage maximizes efficiency, while its integrated error flag output provides a critical diagnostic tool for system health monitoring, making it an superior choice for designing fault-tolerant and robust power systems.

Keywords: Low-Dropout Regulator, Error Flag Output, 150mA Output Current, Overcurrent Protection, Thermal Shutdown.