LM5068

• In-rush current limiting for safe board insertion into live backplanes
• Fast response to over-current fault conditions with active current limiting
• Wide -10V to -100V input voltage range
• Programmable Under-voltage and Over-voltage shutdown protection with adjustable hysteresis
• Programmable Multi-Function Timer for board insertion de-bounce delay
• Fault timer avoids nuisance trips caused by short duration load transients
• Active gate clamping during initial power application
• Available in both latched fault and automatic retry versions
• Available with either active HIGH or active LOW power good flag

The LM5068 hot-swap controller provides intelligent control of power supply connections during the insertion and removal of circuit cards powered by live system backplanes.

The LM5068 provides both in-rush current control and short-circuit protection functions, and limits power supply transients in the backplane caused by the insertion additional circuit cards. The LM5068 controls the external N-Channel MOSFET to provide programmable load current limiting and circuit breaker functions using a single external current sense resistor. The LM5068 issues a power good (PWRGD) signal at the conclusion of a successful poweron sequence. Input over-voltage or under-voltage fault conditions will cancel the PWRGD indication.

The LM5068-1 and -2 indicate power good as an opendrain active high PWRGD state. The LM5068-3 and indicate power-good as an open-drain active low PWRGD state. The LM5068-1 and -3 latch off after a fault condition is detected while the LM5068-2 and -4 continuously re- at intervals set by a programmable timer.

The LM5068 is available in MSOP-8 package.