DC3024A: 12V @ 50A Hot Swap E-Fuse

Demonstration circuit 3024A showcases the LT®4200 50A hot swap E-fuse with guaranteed SOA. Included on the board are input voltage dividers for undervoltage and overvoltage protection, LEDs to indicate input voltage, output voltage, fault and power bad conditions, and jumpers to enable auto retry and to select circuit breaker delay.

Turrets are provided for monitoring input voltage, output voltage, output status, and most of the pins on the LT4200.

The LT4200 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 into a single package for small form-factor applications. The MOSFET safe operating area (SOA) is production tested and guaranteed for the stresses in hot swap applications.

The LT4200 allows 50A of continuous operation at up to 85°C ambient temperature. It provides separate inrush current control and a +/-12% accurate 57A current limit with output dependent foldback.

The current limit threshold can be adjusted dynamically using the ISET pin. Additional features include a current monitor output for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided.

Features

• Allows Safe Board Insertion into Live Backplane

• Wide Operating Voltage Range: 2.9V to 15V (IC not Demo Board)

• Guaranteed Safe Operating Area: 7.5W√s

• 1.2mΩ MOSFET with Current Sense Element

• ±4% Current Monitor Output

• Adjustable Current Limit Threshold

• Temperature Monitor Output

• Overtemperature Protection

• Adjustable Current Limit Timer Before Fault

• Power Good and Fault Outputs

• Adjustable Inrush Current Control

• ±2.5% Accurate Undervoltage and Overvoltage Protection

• Can be used in Parallel