LTC4252-1/LTC4252-2 LTC4252A-1/LTC4252A-2
Negative Voltage Hot Swap Controllers
Features
n Allows Safe Board Insertion ...
LTC4252-1/LTC4252-2 LTC4252A-1/LTC4252A-2
Negative
Voltage Hot Swap Controllers
Features
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% Under
voltage/Over
voltage Threshold Accuracy
(LTC4252A) ■ Adjustable Under
voltage/Over
voltage Protection ■ LTC4252-1/LTC4252A-1: Latch Off After Fault ■ LTC4252-2/LTC4252A-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
Description
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 under
voltage and over
voltage 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 ...