LTC4252BCMS-2#TRPBF

The LTC4252BCMS-2#TRPBF by LT is a negative voltage Hot Swap controller designed for safely inserting and removing boards from live backplanes. It offers robust current control through three stages: a timed circuit breaker, active current limiting, and a fast feedforward path to limit peak fault currents.

This controller includes adjustable undervoltage and overvoltage detectors to protect the load. The supply input is shunt regulated, enabling operation with very high supply voltages. A multifunction timer manages initial start-up and circuit breaker response time, which is further accelerated by sensing excessive MOSFET drain voltage to keep the MOSFET within its safe operating area.

An adjustable soft-start circuit controls MOSFET inrush current during start-up. The LTC4252C-1/LTC4252C-2 variants provide tight ±1% accuracy for undervoltage and overvoltage thresholds. The LTC4252B-1/LTC4252C-1 models latch off after a fault, while the LTC4252B-2/LTC4252C-2 models offer automatic retry. This component is available in an 8-pin or 10-pin MSOP package, suitable for various applications including -48V distributed power systems and central office switching.

The LTC4252B and LTC4252C series enhance the ruggedness of the shunt regulator compared to earlier versions. This makes them a reliable choice for high-availability servers and ATCA systems requiring stable power management.