The LTC4354CDDB is a sophisticated controller designed by Linear Technology to manage diode-OR applications where negative voltages are involved. This component is ideal for systems that require power redundancy to enhance reliability and uptime. It seamlessly controls external N-channel MOSFETs to function as ideal diodes, creating a low loss power path compared to traditional Schottky diodes.

Key Features

• Low Loss Replacement for Schottky Diodes: The LTC4354CDDB uses N-channel MOSFETs to replace power Schottky diodes, significantly reducing power dissipation and heat generation.
• Wide Operating Voltage Range: This device is designed to operate over a broad range of input voltages, typically from -9V to -80V, catering to various negative voltage applications.
• Smooth Switchover: It ensures smooth switchover between power sources without oscillation, providing a stable power supply to load.
• Reverse Input Protection: The controller prevents reverse current flow from output to input, protecting the power sources and the load.
• Gate Drive for External MOSFETs: It provides powerful gate drive for the external MOSFETs, enabling them to turn on and off efficiently.
• Charge Pump for Enhanced Performance: The built-in charge pump ensures that the MOSFETs are fully enhanced, even at low input voltages.
• Status Indicators: The LTC4354CDDB includes status flags that indicate the presence of an input supply and whether a MOSFET is on or off, simplifying system monitoring.

Applications

The LTC4354CDDB is versatile and can be used in a variety of applications, such as:

• Redundant Power Supplies
• Telecommunication Systems
• Data Storage Systems
• Industrial Power Systems

Package and Reliability

Encased in a small 10-lead DFN package (3mm x 3mm), the LTC4354CDDB is designed for compact and space-constrained environments. It is characterized for operation from -40°C to 85°C, ensuring reliable performance across a wide range of environmental conditions.

Conclusion

The LTC4354CDDB from Linear Technology represents a robust solution for systems that require efficient, reliable, and seamless power sharing or redundancy. Its ability to control negative voltage rails with precision and minimal losses makes it an ideal choice for critical applications where uptime is paramount.