Description

The MAX16550 is a protection IC with anintegrated low-resistance MOSFET and lossless currentsensecircuitry featuring SMBus/PMBus™ control andreporting. This IC is designed to provide the optimum solutionfor distribution, control, monitoring and protection of thesystem’s 12V power supply. An internal LDO provides thesupply voltage for the protection IC.If no fault is detected, the IC initiates the startup and hasbeen designed to provide controlled, monotonic startup.Programmable soft-start ramp and delay is implementedto limit the in-rush current during startup.The IC monitors the current and voltage of the 12V systempower rail and provides multiple levels of protection withfast turn-off if a fault is detected.Maxim’s patented, lossless current sense provides highaccuracy current sensing over load and temperature,improving overall system-energy efficiency, and reducingdissipation.Output voltage is monitored at all times. If at any timethe output voltage falls below the programmable outputundervoltage-lockout threshold, the PWRGD signal isasserted low. If at any time the input voltage falls belowthe programmable input undervoltage-lockout threshold,the PWRGD signal is asserted low. The IC can beprogrammed through PMBus to provide input overvoltageprotection. Input overvoltage protection is disabled bydefault. When enabled through PMBus, if the inputvoltage exceeds a programmable overvoltage threshold,the MOSFET is latched off and a fault indicated.Applications240VACircuit Breaker/E-Fuse, Hot SwapIntegrated Protection IC on 12VServers, Networking, Storage, Communication Equipment and AC/DC Power Supplies