LTC4252-2IMS#PBF

LTC4252-2 is a negative voltage Hot Swap™ controller. It allows 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 feedforward path that limits peak current under worst-case catastrophic fault conditions. Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. This device’s 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. It is used in supplication such as hot board insertion, electronic circuit breaker, -48V distributed power systems, negative power supply control, central office switching, high availability servers, ATCA etc.

• Floating topology permits very high voltage operation
• Current limit with circuit breaker timer
• Fast response time limits peak fault current
• Programmable soft-start current limit
• Programmable timer with drain voltage accelerated response
• Automatic retry after fault
• ±1% undervoltage/overvoltage threshold accuracy
• VIN supply current is 0.9mA typical at (UV = OV = 4V, VIN = (VZ – 0.3V)
• Operating temperature is -40°C to 85°C
• Package style is 10-lead plastic MSOP

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