Part # LM5068 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM5068 Negative Voltage Hot Swap Controller

Part Details:

LM5068 December 2004 Negative LM5068Negative Voltage Hot Swap ControllerGeneral Description Features The LM5068 hot-swap controller provides intelligent control n Safe module insertion and removal from live backplanes Voltage of power supply connections during the insertion and re- n In-rush current limiting for safe board insertion into live moval of circuit cards powered by live system backplanes. backplanes The LM5068 provides both in-rush current control and short- n Fast response to over-current fault conditions with active circuit protection functions, and limits power supply tran- current limiting sients in the backplane caused by the insertion of additional n -10V to -90V input range Hot circuit cards. The LM5068 controls the external N-Channel n Programmable under-voltage/over-voltage shutdown MOSFET to provide programmable load current limiting and protection with adjustable hysteresis circuit breaker functions using a single external current n Programmable multi-function timer for board insertion Swap sense resistor. The LM5068 issues a power good (PWRGD) de-bounce delay signal at the conclusion of a successful power-on sequence. n Fault timer avoids nuisance trips caused by short Input over-voltage or under -voltage fault conditions will can- duration load transients cel the PWRGD indication. n Active gate clamping during initial power application Controller The LM5068-1 and -2 indicate power-good as an open-drain n Available in both latched fault and automatic re-try active HIGH PWRGD state. The LM5068-3 and -4 indicate versions power-good as an open-drain active LOW PWRGD state. n Available with either active HIGH or active LOW power The LM5068-1 and -3 latch off after a fault condition is good flag detected while the LM5068-2 and -4 continuously re-try atintervals set by a programmable timer. Applications The LM5068 is available in a MSOP-8 package. n - 48V Power Modules n Central Office Switching n Distributed Power Systems n Electronic Circuit Breaker n PBX Systems n Negative Power Supply Control Typical Application 20078601 Negative Power Supply Control

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LM5068.pdf Datasheet