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 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 LTC4251IS6#TRPBF 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.
UV/OVLTC4251-43V / -75VLTC4251-1-36V / -72VLTC4251-2-43V UV OnlyLTC4251B-43V / -75VLTC4251B-1-36V / -72VLTC4251B-2-43V UV Only
Feature
Allows Safe Board Insertion and Removal from a Live –48V Backplane
Floating Topology Permits Very High Voltage Operation
Low Profile (1mm) ThinSOT™ Package
Programmable Analog Current Limit with Circuit Breaker Timer
Fast Response Time Limits Peak Fault Current
Programmable Timer
Programmable Undervoltage/Overvoltage Protection
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
(Picture: Pinout)
(Picture: Diagram)
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
