The MAX16550A/MAX16550B are protection ICs with an integrated low-resistance MOSFET and lossless current-sense circuitry featuring SMBus/PMBus™ control and reporting. The ICs are designed to provide the optimum solution for distribution, control, monitoring and protection of the system’s 12V power supply. An internal LDO provides the supply voltage for the protection IC.If no fault is detected, the ICs initiate the startup and have been designed to provide controlled, monotonic startup. Programmable soft-start ramp and delay is implemented to limit the in-rush current during startup.The ICs monitor the current and voltage of the 12V system power rail and provide multiple levels of protection with fast turn-off if a fault is detected.Maxim’s patented, lossless current sense provides high accuracy current sensing over load and temperature, improving overall system-energy efficiency, and reducing dissipation.If, at any time, the output voltage falls below the programmable output undervoltage-lockout threshold, the PWRGD signal is asserted low. If at any time the input voltage falls below the programmable input undervoltage-lockout threshold, the PWRGD signal is asserted low.See the Basic Application Circuit utilizing the MAX16550A/ MAX16550B ICs.ApplicationsCircuit Breaker/E-Fuse, Hot SwapIntegrated Protection IC on 12VServers, Networking, Storage, Communication Equipment and AC/DC Power Supplies