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LTC4232 - 5A Integrated Hot Swap Controller

The LTC®4232 is an integrated solution for Hot Swap applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications.

The LTC4232 provides separate inrush current control and a 10% accurate 5A current limit with foldback current limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided. For a 2A pin compatible version, see LTC4217.

The LTC4232-1 (separate data sheet) allows faster turn-on than the LTC4232 by providing 16ms debounce delay and external control of the GATE ramp rate.

Features Allows Safe Board Insertion into a Live Backplane Small Footprint 33mΩ MOSFET with RSENSE Wide Operating Voltage Range: 2.9V to 15V Adjustable, 10% Accurate Current Limit Current and Temperature Monitor Outputs Overtemperature Protection Adjustable Current Limit Timer Before Fault Power Good and Fault Outputs Adjustable Inrush Current Control 2% Accurate Undervoltage and Overvoltage Protection Pin Compatible with LTC4217 (DFN Package Only) Available in 16-Lead 5mm × 3mm DFN Package Typical Application

Applications RAID Systems, Solid State Drives Server I/O Cards Industrial Packaging

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