LTC4251CS6#TR - Negative Voltage Hot Swap Controller

The LTC4251CS6#TR is a compact, feature-rich negative voltage hot swap controller designed by Linear Technology, now part of Analog Devices, to enable safe board insertion and removal from a live backplane. This component is particularly suitable for systems that require a reliable solution to manage the inrush current associated with plugging in a module into a powered system, thus preventing damage to connectors, backplane traces, and the power supply itself.

Encased in a space-saving SOT-23 package, the LTC4251CS6#TR is designed to control an external N-channel MOSFET to gently power up capacitors, avoiding sparks at the connector and system glitches. It operates over a voltage range of -9V to -80V, providing versatility for a wide range of applications, including telecom and datacom systems, industrial equipment, and server hot swap environments.

One of the key features of the LTC4251CS6#TR is its overcurrent protection, which is achieved through the use of a sense resistor to monitor the load current. If the current exceeds a preset threshold, the controller will turn off the MOSFET to prevent damage. Additionally, the LTC4251CS6#TR offers an adjustable undervoltage lockout (UVLO) feature that ensures the MOSFET remains off until the input voltage is within an acceptable range, enhancing the safety and reliability of the system.

This hot swap controller also includes a timer that provides a controlled power-up period, which can be set by an external capacitor. After the timer expires, if the part is not latched off due to a fault condition, the MOSFET remains on, allowing normal operation of the load. In the event of a fault, the LTC4251CS6#TR features an auto-retry function that will attempt to restart the load after a cool-down period, thus offering a self-healing mechanism for transient faults.

The LTC4251CS6#TR is available in a RoHS compliant and lead-free package, marked with the #TR designation, indicating it is provided in tape and reel packaging suitable for automated manufacturing processes. This product is an excellent choice for engineers looking for a robust hot swap solution that can manage negative supply voltages with ease and reliability.