MAX16550/MAX16551 Integrated Protection ICs Analog Devices Inc. MAX16550/MAX16551 Integrated Protection ICs come 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 are implemented to limit the in-rush current during startup.