High-Efficiency 5V/150mA Low-Dropout Regulator with ENABLE Using Microchip MIC5166YML-TR

In modern electronic systems, power management efficiency and board space are critical design constraints. The Microchip MIC5166YML-TR addresses these challenges as a high-efficiency, low-dropout (LDO) linear regulator capable of delivering up to 150mA of output current at a fixed 5V output. Its compact MLF-4 (2x2mm) package makes it ideal for space-constrained applications such as portable devices, IoT modules, and battery-powered systems.

A key feature of this LDO is its ultra-low dropout voltage—typically 100mV at full load—which maximizes efficiency and extends battery life by allowing operation with very small headroom between input and output voltages. This is particularly valuable in applications where the input voltage source is close to 5V, such as in systems powered by a single lithium-ion cell or a USB power supply.

The integrated ENABLE pin provides on/off control of the regulator, allowing the system to place the device into a low-quiescent-current shutdown mode (typically <1µA). This feature is essential for power-sensitive designs, enabling longer standby times and smarter power management sequencing. The enable function is compatible with standard logic levels, making it easy to interface with microcontrollers or system power management ICs.

Furthermore, the MIC5166YML-TR offers excellent line and load regulation, along with built-in protection features such as current limiting and thermal shutdown. These safeguards enhance system reliability by protecting the regulator and downstream components under fault conditions. Its low output noise and fast transient response also make it suitable for powering noise-sensitive analog and RF circuitry.

ICGOODFIND: The MIC5166YML-TR is an optimal solution for designers seeking a compact, efficient, and feature-rich 5V LDO regulator. Its combination of low dropout, enable control, and robust protection makes it a versatile choice for modern low-power applications.

Keywords: Low-Dropout Regulator, Enable Pin, 150mA Output, MIC5166YML-TR, Power Efficiency