LTC1642IGN - Hot Swap Controller from Linear Technology

The LTC1642IGN is a sophisticated and reliable Hot Swap Controller designed by Linear Technology, now part of Analog Devices, to ensure safe board insertion and extraction from live backplanes. This component is ideal for protecting systems against high inrush currents that can damage connectors, cause voltage drops, or disrupt the stable operation of existing circuits on the power bus.

Encased in a narrow 16-pin SSOP package, the LTC1642IGN offers a compact solution for hot swap applications. Its primary function is to control the gate voltage of an external N-channel MOSFET to gently power up capacitors, thereby limiting the inrush current during the insertion of a card. It also provides a controlled discharge path for capacitors when a card is removed.

The device features an adjustable overcurrent threshold and time delay, which allows designers to tailor the protection to their specific needs. The LTC1642IGN also has a current monitor output that provides a real-time analog voltage output proportional to the load current, which can be useful for system diagnostics and monitoring purposes.

Another key feature of the LTC1642IGN is its undervoltage and overvoltage lockout capabilities, which protect the load from operating outside of its safe supply voltage range. The controller ensures that the MOSFET remains off if the supply voltage is not within the preset undervoltage and overvoltage thresholds.

For enhanced safety, the LTC1642IGN includes an automatic retry feature that turns the MOSFET off after a fault condition and then periodically attempts to turn it back on until the fault is cleared. This auto-retry function helps to prevent damage from persistent overcurrent conditions.

With its robust feature set, the LTC1642IGN Hot Swap Controller is a critical component for creating hot-swappable systems that require high reliability and protection. Its precise control and monitoring capabilities make it a top choice for telecom and datacom applications, as well as industrial and high-availability systems where uninterrupted operation is essential.

Designers looking for a high-performance hot swap solution will find the LTC1642IGN to be a versatile and dependable option that enhances the safety and integrity of their systems.