MAX16550

MAX16550/MAX16551 Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface General Description The MAX16550/MAX16551 are protection ICs with an integrated low-resistance MOSFET and lossless currentsense 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. The MAX16551 also provides PMBus-programmable 240VA overpower-fault protection. Maxim’s patented, lossless current sense provides high accuracy current sensing over load and temperature, improving overall system-energy efficiency, and reducing dissipation. Output voltage is monitored at all times. 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. The ICs can be programmed through PMBus...