Linear Technology LTC4261IGN Negative Voltage Hot Swap Controller

The LTC4261IGN is a sophisticated negative voltage hot swap controller designed by Linear Technology to enable safe board insertion and removal from a live backplane. This device is tailored for systems with a supply voltage ranging from -9V to -80V, providing a robust solution for managing negative voltage power supplies.

The LTC4261IGN integrates a charge pump that controls an external N-channel MOSFET, allowing it to operate over a wide range of supply voltages without the need for an additional negative supply. This feature simplifies the design and reduces the overall system cost and complexity.

Key features of the LTC4261IGN include electronic circuit breaker protection which limits the amount of current that can be drawn, thus protecting both the power supply and the hot-swapped board from potential damage. The foldback current limit reduces the power dissipation in the MOSFET during overcurrent conditions, enhancing system reliability.

The controller also offers a multi-function timer that provides control over the fault timeout period. This timer can be adjusted to suit various system requirements, ensuring a flexible and adaptable protection mechanism. Additionally, the LTC4261IGN provides a power good output, which allows for precise monitoring of the system's power status, and an ON pin that gives the user manual control over the MOSFET's gate.

For increased resilience, the LTC4261IGN features an under-voltage lockout (UVLO) that ensures the MOSFET remains off if the supply voltage is too low, preventing erratic system behavior. Furthermore, the device is equipped with an overvoltage protection circuit that protects downstream circuits from voltage spikes.

The LTC4261IGN comes in a compact 16-lead SSOP package, making it suitable for space-constrained applications. Its robust feature set and compact form factor make it an excellent choice for managing negative voltage rails in telecommunications, data center, and industrial systems where reliable power management is critical.

With its combination of protection features, wide voltage range, and compact design, the LTC4261IGN is a versatile and reliable solution for hot swap applications that demand precise control and robust protection.