Hot Swap Controller

The LTC4218 is a Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages from 2.9V to 26.5V. A dedicated 12V version (LTC4218-12) contains preset 12V specific thresholds, while the standard LTC4218 allows adjustable thresholds.

The LTC4218 provides an accurate (5%) current limit with current foldback limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense voltage for ground referenced current sensing. Overvoltage, undervoltage and power good monitoring are also provided.

Applications

* RAID Systems

* ATCA, AMC, μTCA Systems

* Server I/O Cards

* Industrial

* Wide Operating Voltage Range: 2.9V to 26.5V

* Adjustable, 5% Accurate 15mV Current Limit

* Current Monitor Output

* Adjustable Current Limit Timer Before Fault

* Power Good and Fault Outputs

* Adjustable Inrush Current Control

* 2% Accurate Undervoltage and Overvoltage Protection

* Available in 16-Lead SSOP and 16-Pin 5mm × 3mm DFN Packages