Linear Technology LTC4224CMS-2#PBF Hot Swap Controller

The LTC4224CMS-2#PBF from Linear Technology is a compact, low voltage Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. Designed for use in systems with dual supply voltages, this controller operates over a voltage range of 2.5V to 5.5V, which makes it ideal for protecting systems that run on low voltage supplies.

This device provides a safe and controlled manner of power-up sequencing by controlling the gate voltages of external N-channel MOSFETs to limit inrush current during plug-in. The LTC4224CMS-2#PBF ensures that the MOSFETs remain in the safe operating area (SOA) while the supply capacitors are charged. This feature is critical for preventing damage to circuit components and connectors, as well as avoiding voltage drops on the main supply that could reset other system components.

The LTC4224CMS-2#PBF is designed with an overcurrent protection feature that protects the host and the hot-swappable board from damage due to short circuits or excessive load currents. This is achieved through the use of a timed circuit breaker function that limits the duration of the overcurrent condition. Furthermore, the product offers an adjustable overvoltage protection and undervoltage lockout to ensure the connected load operates within the safe voltage range.

For ease of design and space-saving considerations, this Hot Swap controller is available in a 10-lead MSOP package. Its low quiescent current and the absence of a need for a separate power supply make it an efficient choice for portable and space-constrained applications. The LTC4224CMS-2#PBF also features a power good output that can be used to enable a downstream converter, indicating that the load capacitor has been sufficiently charged and the output voltage is within regulation.

Overall, the LTC4224CMS-2#PBF is a reliable and robust solution for hot swap applications in servers, network cards, and other electronic systems that require safe insertion and removal of circuit boards without interrupting system operation.