The LTC4282 is an energy monitoring hot swap controller with dual current-limited paths to ease high current kilowatt-level board designs where current levels approach or exceed 100A. The controller ensures safe board insertion and removal from live 2.9V to 33V backplanes by controlling external N-channel MOSFETs to gently power up bulk capacitors, avoiding sparks, connector damage, and system glitches. Sitting at the gateway to board power, the 0.7% accurate 12- or 16-bit ADC of the LTC4282 reports board voltage, current, power, and energy consumption through an I²C/SMBus digital interface. Internal EEPROM provides nonvolatile storage for register configuration and fault log data, speeding debug and failure analysis. The LTC4282 has a 2% current limit accuracy, minimizing power supply overdesign which becomes more important at high power levels. During overcurrent conditions, the LTC4282 folds back its current limit to maintain constant MOSFET power dissipation for an adjustable timeout period. Digitally configurable current limit enables dynamic adjustment with load changes and eases selection of low value sense resistors. Minimum and maximum values of the monitored electrical parameters are recorded, with alerts raised when they exceed 8-bit thresholds. To prevent catastrophic damage to the board, the MOSFETs are continuously monitored for abnormal conditions such as low gate voltage, drain-to-source short-circuit, or large voltage drop.