Linear Technology LTC4215IUFD Hot Swap Controller

The LTC4215IUFD from Linear Technology is a sophisticated, compact hot swap controller that is designed to manage the insertion and removal of circuit boards from a live backplane. This component is housed in a 24-lead QFN package and offers a wide range of features to ensure the safety and reliability of high-availability systems.

The LTC4215IUFD enables safe board insertion by controlling an external N-channel MOSFET to gently power up capacitors, avoiding sparks at the connector and limiting inrush current. Its adjustable overcurrent threshold and circuit breaker functionalities protect both the card and backplane from excessive currents that could lead to damage or system instability.

This hot swap controller operates over a wide input voltage range from 2.9V to 26.5V, catering to a variety of applications including servers, storage systems, and network equipment. The LTC4215IUFD also features a high side drive for the gate of the external MOSFET, which allows for the use of common ground systems and simplifies board layout.

Advanced features of the LTC4215IUFD include an adjustable current limit, overcurrent fault timer, and power good indicator, which provide system designers with tools to monitor and control the power-up sequence. Additionally, the product offers undervoltage and overvoltage protection, ensuring that the connected load is safeguarded against abnormal voltage conditions.

The device also includes a multi-function timer that can be used to set the fault timer period, control the duration of the startup current limit, and determine the power good delay. This level of configurability makes the LTC4215IUFD a versatile choice for various hot swap applications.

For thermal management, the LTC4215IUFD includes an overtemperature protection feature that shuts down the MOSFET if the die temperature exceeds safe operating limits. This helps to prevent thermal runaway and maintain system integrity under all conditions.

Overall, the LTC4215IUFD from Linear Technology is a robust, feature-rich hot swap controller that provides designers with the tools necessary to ensure safe and reliable power management for hot-swappable boards.