LTC4251B
Info : RECOMMENDED FOR NEW DESIGNS
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LTC4251B

Negative Voltage Hot Swap Controllers in SOT-23

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 12
1ku List Price Starting From $2.43
Features
  • Allows Safe Board Insertion and Removal from a Live –48V Backplane
  • Floating Topology Permits Very High Voltage Operation
  • Programmable Analog Current Limit with Circuit Breaker Timer
  • Fast Response Time Limits Peak Fault Current
  • Improved Ruggedness Shunt Regulator
  • Programmable Timer
  • Programmable Undervoltage/Overvoltage Protection
  • Low Profile 6-Lead SOT-23 (ThinSOT) Package
Additional Details
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The LTC4251B/LTC4251B-1/LTC4251B-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 feedforward path that limits peak current under worst-case catastrophic fault conditions.

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 LTC4251B UV/OV thresholds are designed to match the standard telecom operating range of –43V to –75V. The LTC4251B-1 UV/OV thresholds extend the operating range to encompass –36V to –72V. The LTC4251B-2 implements a UV threshold of –43V only. The LTC4251B improves the ruggedness of the LTC4251 shunt regulator.

UV/OV
LTC4251 –43V/–75V
LTC4251-1 –36V/–72V
LTC4251-2 –43V UV Only
LTC4251B –43V/–75V
LTC4251B-1 –36V/–72V
LTC4251B-2 –43V UV Only

Applications

  • Hot Board Insertion
  • Electronic Circuit Breaker
  • –48V Distributed Power Systems
  • Negative Power Supply Control
  • Central Office Switching
  • Programmable Current Limiting Circuit
  • High Availability Servers
  • Disk Arrays
Part Models 12
1ku List Price Starting From $2.43

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC4251BCS6#TRMPBF
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LTC4251BCS6-1#TRMPBF
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LTC4251BCS6-2#TRMPBF
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LTC4251BIS6#TRMPBF
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LTC4251BIS6-1#TRMPBF
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LTC4251BIS6-2#TRMPBF
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LTC4251BIS6-2#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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