Negative Voltage Hot Swap Controllers in SOT-23

Posted on Feb 4, 2014

The LTC4251/LTC4251-1/LTC4251-2 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feed forward path that limits peak current under worst-case catastrophic fault con

Negative Voltage Hot Swap Controllers in SOT-23
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ditions. Programmable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The supply input is shunt regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial start-up and controls the circuit breaker`s response time. The LTC4251 UV/OV thresholds are designed to match the standard telecom operating range of 43V to 75V. The LTC4251-1 UV/OV thresholds extend the operating range to encompass 36V to 72V. The LTC4251-2 implements a UV threshold of 43V only.

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