LTC4253B

LTC4253B –48V Hot Swap Controller with Sequencer Features n Allows Safe Board Insertion and Removal from a Live –48V Backplane n Floating Topology Permits Very High Voltage Operation n 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 Applications n –48V Distributed Power Systems n Negative Power Supply Control n Central Office Switching n High Availability Servers n Disk Arrays L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Description The LTC®4253B negative voltage Hot Swap™ 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. 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, allo...