**LTC4380HMS-4#WPBF: A Robust Surge Stopper and Overvoltage Protector for Demanding Applications**

In the realm of electronic systems, voltage transients and overvoltage events pose a constant and severe threat to circuit integrity and longevity. Protecting sensitive downstream components from these unpredictable surges is paramount, especially in industrial, automotive, and telecommunications applications. The **LTC4380HMS-4#WPBF** from Analog Devices stands out as a highly robust and integrated solution designed to meet this critical challenge head-on.

This device is not merely a simple voltage clamp; it is a sophisticated **surge stopper and overvoltage protector** that controls an external N-channel MOSFET to create an ideal diode function with a very low forward voltage drop. Its primary mission is to **shield sensitive circuitry from high-voltage transients** by swiftly regulating the output voltage during surge events, while also providing protection against negative voltages.

A key strength of the LTC4380HMS-4 lies in its **wide operating voltage range of 4V to 80V**, making it exceptionally versatile for both standard and high-voltage systems. It can withstand transient surges far beyond this range, up to 100V. The device features an adjustable **overvoltage (OV) and undervoltage (UV) lockout** threshold, allowing designers to set precise window limits for system operation. When an overvoltage condition is detected, the LTC4380 quickly transitions into a constant-current mode, limiting the current through the external MOSFET and preventing the output voltage from exceeding a safe, user-defined level. This **fast response time is critical for safeguarding modern, delicate ICs** that can be damaged in microseconds.

Furthermore, the LTC4380HMS-4 incorporates advanced **foldback current limiting** during short-circuit events. This feature drastically reduces the power dissipation and thermal stress on the external MOSFET, enhancing overall system reliability. The device is offered in a compact **MSOP-10 package with an operating temperature range of -40°C to 125°C**, ensuring robust performance even in the harshest environmental conditions.

ICGOODFIND: The LTC4380HMS-4#WPBF is an exceptional choice for engineers designing systems where reliability is non-negotiable. Its blend of wide voltage range, precise fault protection, and robust construction makes it an indispensable component for automotive load-dump protection, industrial control systems, and telecom infrastructure, ensuring operational continuity and enhanced system lifespan.

**Keywords:**

* Overvoltage Protection (OVP)

* Surge Stopper

* Voltage Transient

* Current Limiting

* Fault Protection