DESCRIPTION

· The LM5068 is a hot-swap controller designed for intelligent control of power supply connections during the insertion and removal of circuit cards from live system backplanes.

· It provides in-rush current control and short-circuit protection, limiting power supply transients caused by additional circuit card insertions.

· The controller manages an external N-Channel MOSFET to offer programmable load current limiting and circuit breaker functions using a single external current sense resistor.

· It issues a power good (PWRGD) signal after a successful power-on sequence, which is canceled in case of over-voltage or under-voltage fault conditions.

· The LM5068 is available in different versions that either latch off or automatically re-try after a fault, and it comes in a VSSOP-8 package.

FEATURES

· Safe module insertion and removal from live backplanes with in-rush current limiting for safe board insertion.

· Fast response to over-current fault conditions with active current limiting.

· Operates within a -10V to -90V input range.

· Programmable under-voltage/over-voltage shutdown protection with adjustable hysteresis.

· Programmable multi-function timer for board insertion de-bounce delay and fault timer to avoid nuisance trips.

· Active gate clamping during initial power application.

· Available in both latched fault and automatic re-try versions with either active HIGH or active LOW power good flag.

APPLICATIONS

· -48V power modules.

· Central office switching.

· Distributed power systems.

· Electronic circuit breaker.

· PBX systems.

· Negative power supply control.