**LTC4359HMS8#WTRPBF: Ideal Diode Controller for High Availability Systems**

In mission-critical applications where system uptime is paramount, power supply redundancy is a fundamental design requirement. Traditional Schottky diodes have long been used to OR power sources together, but their significant forward voltage drop leads to wasteful power dissipation, heat generation, and reduced efficiency. The **LTC4359HMS8#WTRPBF** from Analog Devices provides an elegant and robust solution, **replacing power-wasting diodes with a near-ideal diode function** using a low-loss N-channel MOSFET.

This controller seamlessly manages the transition between two or more power supplies, ensuring continuous power to the load even if one source fails. It operates by **controlling an external N-channel MOSFET to emulate an ideal diode** with a very low forward voltage drop—typically just tens of millivolts. This drastic reduction in voltage drop translates directly into **substantially lower power loss and reduced heat generation**, eliminating the need for large heat sinks and enabling more compact, reliable designs.

A key feature of the LTC4359 is its **fast turn-off capability, which prevents reverse current flow** and protects the system if an input voltage drops below the output voltage or fails completely. This swift response is critical in maintaining system integrity and protecting sensitive downstream components. Furthermore, the device includes **programmable current limiting** to safeguard the external MOSFET during fault conditions like short circuits or in-rush currents, enhancing overall system robustness.

Housed in a compact MSOP-8 package, the LTC4359 is designed for high availability systems such as telecommunications and networking equipment, servers, storage arrays, and industrial automation. Its ability to **ensure seamless power source switchover** with minimal loss makes it an indispensable component for architects designing for reliability and efficiency.

**ICGOODFIND:** The LTC4359HMS8#WTRPBF is a superior solution for power ORing and redundancy, offering high efficiency, thermal management advantages, and critical protection features that are essential for modern high-availability systems.

**Keywords:** Ideal Diode Controller, Power ORing, High Availability Systems, Reverse Current Protection, Low Voltage Drop.