The MAX5977 allows line cards to be safely inserted and removed from a live backplane without causing glitches on the system power-supply rail. It is rated for 1V to 16V input and can withstand transients or inductive spikes up to 28V. An integrated charge pump drives a low-cost, external n-channel MOSFET. VariableSpeed/BiLevelTM fault protection improves system reliability by quickly responding to overcurrent and short-circuit conditions, while preventing nuisance trips caused by noise or transient conditions. The MAX5977A latches off after a fault condition, while the MAX5977B automatically restarts. Other features include: programmable undervoltage and overvoltage protection, an active-high power-good (open-drain) output, and an active-low (open-drain) fault output.
The MAX5977 is packaged in a 20-pin TQFN-EP and is fully specified over the -40°C to +85°C extended temperature range. Prices start at $1.51 (1000-up, FOB USA).