MIC2091-1YM5-TR: Microchip's 1.5A, 28V Load Switch with Programmable Current Limit

In the realm of power management, efficiently and safely controlling power distribution to various system loads is paramount. The MIC2091-1YM5-TR from Microchip Technology stands out as a robust and highly integrated solution designed to meet these critical demands. This advanced load switch offers a compelling combination of programmable current limiting, high voltage handling, and a small form factor, making it an ideal choice for a wide array of applications from consumer electronics to industrial systems.

At its core, the MIC2091-1YM5-TR is designed to connect or disconnect a power source from a load with minimal power loss. It supports a continuous load current of up to 1.5A and can handle input voltages as high as 28V, providing significant headroom for various power rails. A key differentiator of this IC is its programmable current limit feature. By utilizing a single external resistor, designers can set the precise current threshold at which the device will engage its protection circuitry. This allows for tailored protection of sensitive downstream components, preventing damage from overloads and short circuits while ensuring system reliability.

The device incorporates a low on-resistance (R₄ₛ(ₒₙ)) N-channel MOSFET, which minimizes voltage drop and power dissipation during operation, thereby enhancing overall system efficiency. Furthermore, the MIC2091-1YM5-TR features a controlled turn-on time, which mitigates inrush current—a common cause of voltage sag and system glitches when powering up capacitive loads.

Additional built-in protection features include thermal shutdown, which safeguards the IC from damage due to excessive junction temperature, and an undervoltage lockout (UVLO) function that keeps the switch off until the input voltage reaches a stable, sufficient level. The enable (EN) pin is compatible with low-voltage logic signals, simplifying interface with microcontrollers and other digital logic circuits. Housed in a space-saving 5-pin SOT-23 package, it is an excellent choice for compact, board-space-constrained designs.

ICGOOODFIND: The MIC2091-1YM5-TR is a highly integrated and versatile load switch that excels in simplifying power sequencing and providing robust protection for sensitive circuitry. Its ability to offer programmable current limiting in a miniature package makes it an exceptionally valuable component for designers aiming to improve system reliability and safety without compromising on board space.

Keywords: Programmable Current Limit, Load Switch, 28V Rating, Thermal Shutdown, Power Management.