MIC5239-5.0YS-TR: A 150mA Low-Dropout Linear Regulator for Power-Sensitive Applications

In the realm of modern electronics, efficient power management is critical, especially for portable and battery-operated devices where every milliwatt counts. The MIC5239-5.0YS-TR from Microchip Technology stands out as a high-performance, 150mA low-dropout (LDO) linear regulator designed specifically for power-sensitive applications. This component excels in providing stable and clean power while minimizing energy loss, making it an ideal choice for space-constrained and battery-dependent designs.

One of the key features of the MIC5239-5.0YS-TR is its extremely low dropout voltage, typically 90mV at 150mA load. This allows the regulator to maintain regulation even when the input voltage is only marginally higher than the output voltage, significantly extending battery life in portable devices. With a fixed 5.0V output, it delivers a reliable supply voltage for microcontrollers, sensors, and other low-power components, ensuring consistent performance as the battery discharges.

The device also boasts very low ground current, typically 65μA under full load, which further enhances energy efficiency. This is particularly beneficial in always-on or standby-mode applications where quiescent current directly impacts overall power consumption. Additionally, the MIC5239-5.0YS-TR incorporates built-in protection features such as current limiting and thermal shutdown, safeguarding both the regulator and the downstream circuitry from fault conditions.

Housed in a compact SOT-23-5 package, this LDO is suited for designs with stringent board space constraints. Its minimal external component requirement—only input and output capacitors—simplifies layout and reduces the total solution cost. The high power supply rejection ratio (PSRR) performance helps attenuate noise from input sources, making it suitable for noise-sensitive analog and RF circuits.

ICGOOODFIND: The MIC5239-5.0YS-TR is an excellent solution for designers seeking a balance of efficiency, size, and reliability in low-power applications. Its ultra-low dropout voltage and quiescent current make it indispensable for extending battery life in portable electronics, IoT devices, and medical instruments.

Keywords: Low-dropout regulator, 150mA LDO, Power-sensitive design, Low quiescent current, SOT-23 package.