MAX16550 Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface General Description Benefits and Features The MAX16550 is a protection IC with an MAX1655030A Protection ICn integrated low-resistance MOSFET and lossless current- High-Density (4mm x 4.5mm for 30A): Less than 25% sense circuitry featuring SMBus/PMBus control and of the Board Area of Conventional Solutions reporting. This IC is designed to provide the optimum solu- Monolithic Integration of Power, Control, and Monitoring tion for distribution, control, monitoring and protection of the Integrated Power MOSFET with 1.9m Total Resistance systems 12V power supply. An internal LDO provides the in 12V Power Path (R Including Package) DS(ON) supply voltage for the protection IC. Integrated Lossless, Precise Current Sensing If no fault is detected, the IC initiates the startup and has Integrated LDO Provides V Supply DD (1.8V Bias Suppy) been designed to provide controlled, monotonic startup. Programmable soft-start ramp and delay is implemented Enables Advanced System Power Management to limit the in-rush current during startup. PMBus/SMBus Telemetry with Extensive Status Monitoring and Reporting The IC monitors the current and voltage of the 12V system power rail and provides multiple levels of protection with Load Current Indicator (ILOAD) Pin Provides Ana- log Output Current Reporting with High Accuracy fast turn-off if a fault is detected. Programmable Soft-Start for Inrush Current Limiting Maxims patented, lossless current sense provides high Increases Power-Supply Reliability with IC Self- accuracy current sensing over load and temperature, Protection Features improving overall system-energy efficiency, and reducing Very Fast Fault Detection and Isolation dissipation. V to V Short Protection During Startup IN OUT Output voltage is monitored at all times. If at any time Overtemperature Protection the output voltage falls below the programmable output Three Levels of Overcurrent Protection undervoltage-lockout threshold, the PWRGD signal is Programmable Moderate OCP asserted low. If at any time the input voltage falls below Programmable Severe OCP Provides Isolation the programmable input undervoltage-lockout threshold, < 5s. the PWRGD signal is asserted low. The IC can be Fail-Safe Safe OCP Provides Isolation < 250ns. programmed through PMBus to provide input overvoltage Additional Features protection. Input overvoltage protection is disabled by default. When enabled through PMBus, if the input Programmable Soft-Start and Delay voltage exceeds a programmable overvoltage threshold, Programmable Input Undervoltage-Lockout Threshold the MOSFET is latched off and a fault indicated. (UVLO) Programmable Power-Good Threshold PWRGD Pin for Output UVLO/Input UVLO Reporting FAULT Pin for Fault Reporting Systems and Applications Servers, Networking, Storage, Communication Equipment PMBus is a trademark of SMIF, Inc. and AC/DC Power Supplies Integrated Protection IC on 12V Circuit Breaker/E-Fuse, Hot Swap Ordering Information appears at end of data sheet. 19-8584 Rev 3 8/20MAX16550 Integrated Protection IC on 12V Bus with an Integrated MOSFET, Lossless Current Sensing, and PMBus Interface Basic Application Circuit SOFT-START PROGRAMMING 12V V SS V IN OUT POWER SUPPLY MAX16550 EN/UVLO PWRGD ENABLE FAULT OUTPUT LOAD PMBUS ROCP GND ILOAD SYSTEM CONTROLLER MODERATE CURRENT OCP REPORTING PROGRAMMING Maxim Integrated 2 www.maximintegrated.com