LTC4253B
–48V Hot Swap Controller
with Sequencer
Features Description Allows Safe Board Insertion and Removal from a
Live –48V Backplane
n Floating Topology Permits Very High Voltage
Operatio Adjustable Analog Current Limit with Breaker Timer
Ideal for Two Battery Feeds
n Fast Response Time Limits Peak Fault Current
n Three Sequenced Power Good Outputs
n Improved Ruggedness Shunt Regulator
n Adjustable Soft-Start Current Limit
n Adjustable Timer with Drain Voltage Accelerated
Response
n Latchoff After Fault
n Available in a 16-Pin SSOP Package The LTCВ®4253B negative voltage Hot Swapв„ў 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. The
LTC4253B latches off after a circuit fault. n Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the
desired operating range. The LTC4253B’s supply input is
shunt-regulated, allowing safe operation with very high …