MAX5973

www.DataSheet4U.com 19-5243; Rev 0; 4/10 Phase Redundancy Power Supervisor MAX5973 General Description The MAX5973 protects individual slave phases of a phase redundant DC-DC converter. The power protection functions comprise an electronic circuit-breaker controller driving an external n-channel MOSFET at the step-down power input, and an internal 3.3V switch for the slave phase-controller power. To protect the output bus, an “ideal diode” controller drives an external n-channel MOSFET at the slave phase output. Serial data to and from the slave phase is buffered by the MAX5973 to prevent a failure of one phase from interrupting communication to the remaining phases. Similarly, the differential analog error signals for the phase controller are also buffered. An overvoltage comparator and switched-node monitoring function allows the MAX5973 to disable a phase that has a shorted (or latched-on) high-side MOSFET. A fault-status output and a FAULTIN input allow a master device to monitor and control each MAX5973 device. The MAX5973 is offered in a 5mm x 5mm, 40-pin TQFN package and is fully specified from -40NC to +85NC. PART MAX5973ETL+ Features S 9V to 14V Operating Range S Electronic Circuit-Breaker Controller Drives External n-Channel MOSFET S Internal, 350mA MOSFET for 3.3V Power S Open-Drain Ideal Diode Controller Drives External n-Channel MOSFET S Serial Data Bus Loop/Bypass Function S Serial Data Clock Buffer S Dual Analog Error-Signal Buffer Amplifiers S Activ...