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LTC4252B-1

Linear
Part Number LTC4252B-1
Manufacturer Linear
Description Negative Voltage Hot Swap Controllers
Published Mar 26, 2016
Detailed Description LTC4252B-1/LTC4252B-2 LTC4252C-1/LTC4252C-2 Negative Voltage Hot Swap Controllers FEATURES DESCRIPTION n Allows Safe...
Datasheet PDF File LTC4252B-1 PDF File

LTC4252B-1
LTC4252B-1

Overview
LTC4252B-1/LTC4252B-2 LTC4252C-1/LTC4252C-2 Negative Voltage Hot Swap Controllers FEATURES DESCRIPTION n Allows Safe Board Insertion and Removal from a Live – 48V Backplane n Floating Topology Permits Very High Voltage Operation n Current Limit With Circuit Breaker Timer n Fast Response Time Limits Peak Fault Current n Programmable Soft-Start Current Limit n Programmable Timer with Drain Voltage Accelerated Response n ±1% Undervoltage/Overvoltage Threshold (LTC4252C) n Improved Ruggedness Shunt Regulator ■ Adjustable Undervoltage/Overvoltage Protection ■ LTC4252B-1/LTC4252C-1: Latch Off After Fault ■ LTC4252B-2/LTC4252C-2: Automatic Retry After Fault ■ Available in 8-Pin and 10-Pin MSOP Packages APPLICATIONS n Hot Board Insertion n Electronic Circuit Breaker n – 48V Distributed Power Systems n Negative Power Supply Control n Central Office Switching n High Availability Servers n ATCA The LTC®4252 negative voltage Hot SwapTM controller 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.
The LTC4252’s supply input is shunt regulated, allowing safe operation with very high supply voltages.
A multifunction timer delays initial startup and controls the circuit breaker’s response time.
The circuit breaker’s response time is accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA).
An adjustable softstart circuit controls MOSFET inrush current at start-up.
The LTC4252-2 provides automatic retry after a fault.
The LTC4252C-1/LTC4252C-2 feature tight ±1% undervoltage/ overvoltage threshold accuracy.
The LTC4252 is available in either an ...


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