LT4254CGN#PBF

PMIC - Hot Swap Controllers

The LT4254CGN#PBF is a dual Hot Swap controller from Analog Devices. It is a high-performance, low-cost device that can be used to regulate voltage inefficiencies and power interruptions in high-current applications. This article will explore the application field of the LT4254CGN#PBF as well as its working principles.

Application Field

The LT4254CGN#PBF is designed for a wide variety of applications demanding the highest performance levels while still meeting tight budget requirements including:

• Point-of-load power converters
• High-current FETs
• High-power switching/sequencing/protection
• High-current transient protection
• Power system management

This device is capable of providing precision, high-voltage regulation for applications requiring up to 40V isolation. The combination of intelligent monitoring, polyfuse protection, over-current and over-voltage protection, and programmable power sequencing add robustness and safety when using this device in demanding applications.

Working Principle

The LT4254CGN#PBF is a Hot Swap controller that enables safe insertion and removal of equipment from a live system. In its simplest form, the Hot Swap controller provides an output signal that can turn on or off an external switch (usually an MOSFET) that in turn can power on or off system loads.

Its operating principle is based on two main functional blocks, the main controller and the sensing circuit. The main controller provides monitoring and control of the voltage on the outputs and the current through the external switch. The sensing circuit is used to measure the current, voltage and temperature of the system, and provide protection against over voltage, over current and over temperature. The sensing block can be used to support various monitoring and protection features like power cycling, auto-restart and thermal shutdown.

The LT4254CGN#PBF also provides an additional protection feature called “hot swap” that allows components or systems to be inserted or removed from a live load without impacting the rest of the system. This feature is enabled by the UVLO (Under Voltage Lock Out) that shuts down the system when the voltage drops below a certain point. When the voltage rises again, the system can be powered up without losing any data or damaging the equipment.

Conclusion

The LT4254CGN#PBF is an ideal Hot Swap controller for high-current applications needing high levels of performance while still meeting tight budget requirements. Its combination of intelligent monitoring, polyfuse protection, over-current and over-voltage protection, and programmable power sequencing add robustness and safety to any system. The hot swap feature ensures components and systems can be inserted or removed from a live system without impacting the rest of the load. In total, the LT4254CGN#PBF is an excellent choice when looking for a high-performance Hot Swap controller with smart safety features.