Analog Devices Inc.

Category: Power Management ICs

The MAX5955 and MAX5956 are +1V to +13.2V dualhot-swap controllers with independent on/off control forcomplete protection of dual-supply systems. They allowthe safe insertion and removal of circuit cards into livebackplanes. The MAX5955 and MAX5956 operatedown to 1V provided one of the inputs is above 2.7V.The discharged filter capacitors of the circuit card providelow impedance to the live backplane. High inrushcurrents from the backplane to the circuit card can burnup connectors and components, or momentarily collapsethe backplane power supply leading to a system reset.The MAX5955 and MAX5956 hot-swap controllers preventsuch problems by gradually ramping up the outputvoltage and regulating the current to a preset limit whenthe board is plugged in, allowing the system to stabilizesafely. After the startup cycle is completed, two on-chipcomparators provide VariableSpeed/BiLevel™ protectionagainst short-circuit and overcurrent faults, as well asimmunity against system noise and load transients. In theevent of a fault condition, the load is disconnected. TheMAX5955B and MAX5956B must be unlatched after afault, and the MAX5955A and MAX5956A automaticallyrestart after a fault.The MAX5955 and MAX5956 integrate an on-boardcharge pump to drive the gates of low-cost, external n-channelMOSFETs. The devices offer integrated featureslike startup current regulation and current glitchprotection to eliminate external timing resistors andcapacitors. These devices provide open-drain statusoutputs, an adjustable startup timer, and adjustablecurrent limits. The MAX5955 provides output undervoltage/overvoltage protection for each channel, while theMAX5956 provides undervoltage/overvoltage monitoringfor each channel.The MAX5955 and MAX5956 are available in a space-saving16-pin QSOP package.ApplicationsBase Station Line CardsHot Plug-In Daughter CardsNetwork Switches, Routers, HubsPortable Computer Device Bays (Docking Stations)Power-Supply SequencingRAIDSolid-State Circuit Breakers

* $7.63 - $7.20