Click here for production status of specific part numbers. MAX5079 ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off General Description Benefits and Features The MAX5079 ORing MOSFET controller replaces ORing Drives External MOSFETs Reducing Power diodes in high-reliability redundant, parallel-connected Dissipation and Board Space power supplies. Despite their low forward-voltage drop, 2.75V to 13.2V Input ORing Voltage ORing Schottky diodes cause excessive power dissipa- 1V to 13.2V Input ORing Voltage with 2.75V tion at high currents. The MAX5079 allows for the use of AuxiliaryVoltage 14-Pin TSSOP Package low-on-resistance n-channel power MOSFETs to replace the Schottky diodes. This results in low power dissipation, Protection Features Increase System Reliability smaller size, and elimination of heatsinks in high-power 2A MOSFET Gate Pulldown Current During Fault applications. Condition The MAX5079 operates from 2.75V to 13.2V and includes Ultra-Fast 200ns, MOSFET Turn-Off During Fault Condition a charge pump to drive the high-side n-channel MOSFET. Supply Undervoltage and Bus Overvoltage Operation down to 1V is possible if an auxiliary voltage Detection of at least 2.75V is available. When the controller detects Power-Good (PGOOD) and Overvoltage (OVP) a positive voltage difference between IN and BUS, the Outputs for Fault Detection n-channel MOSFET is turned on. The MOSFET is turned off as soon as the MAX5079 sees a negative potential at IN with respect to the BUS voltage, and is automatically turned back on when the positive potential is restored. Typical Operating Circuit Under fault conditions, the ORing MOSFETs gate is SUB 75N 03-04 pulled down with a 1A current, providing an ultra-fast BUS COMMON 1V TO 13.2V VBUS N1 200ns turn-off. The reverse voltage turn-off threshold is VOUT1 POWER SUPPLY 1 externally adjustable to avoid unintentional turn-off of the (PS1) V IN IN GATE BUS ORing MOSFET due to glitches at IN or BUS caused by >2.75V U1 AUXIN PGOOD hot plugging the power supply. UVLO MAX5079 OVI Additional features include an OVP flag to facilitate shut- STH OVP C+ C- FTH GND down of a failed power supply due to an overvoltage R C STH STH is condition, and a PGOOD signal that indicates if V IN R FTH C EXT either below the undervoltage lockout or V is in an BUS overvoltage condition. The MAX5079 operates over the -40C to +85C temperature range and is available in a SUB 75N 03-04 space-saving 14-pin TSSOP package. 1V TO 13.2V VBUS N2 V OUT2 POWER SUPPLY 2 V IN (PS2) Applications IN GATE BUS C BUS >2.75V Paralleled DC-DC Converter Modules U2 AUXIN PGOOD N+1 Redundant Power Systems UVLO MAX5079 OVI STH OVP Servers FTH GND C+ C- C Base-Station Line Cards R STH STH RAID R FTH CEXT Networking Line Cards Ordering Information appears at end of data sheet. 19-3584 Rev 4 3/19MAX5079 ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off Absolute Maximum Ratings GATE to GND .............................................-0.3V to (V + 8.5V) Operating Temperature Range ........................... -40C to +85C IN All Other Pins to GND ...........................................-0.3V to +15V Junction Temperature ......................................................+150C Continuous Current Into Any Pin ......................................50mA Storage Temperature Range ............................ -65C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 14-Pin TSSOP (derate 9.1mW/C above +70C) .....727.3mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information PACKAGE TYPE: 14-PIN TSSOP Package Code U14+2 Outline Number 21-0066 Land Pattern 90-0113 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Electrical Characteristics ((V = 2.75V to 13.2V and V = 0V) or (V = 1V and V = 2.75V to 13.2V), R = open, R = 0, V = 1V, V = 0V, IN AUXIN IN AUXIN STH FTH UVLO OVI T = -40C to +85C, unless otherwise noted. Typical values are at V = 12V and T = +25C. See the Typical Operating Circuit.) (Note 1) A IN A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES 2.75 13.20 IN Input Voltage Range V V IN V 2.75V 1.0 13.2 AUXIN AUXIN Input Voltage Range V 0 13.2 V AUXIN (V - V ) High Threshold AUXIN IN V AUXIN (When GATE Connects Directly V rising, I = 10A 4.2 4.9 5.7 V AUXIN GATE THRESHOLD to AUXIN) (Note 2) (V - V ) Hysteresis AUXIN IN V AUXIN (When GATE Connects Directly 40 mV HYSTERESIS To AUXIN) IN Supply Current I V = 1V, V > V 4 mA IN UVLO IN BUS AUXIN Leakage Current I V = 0 20 A LEAK AUX AUXIN V = 1V, V = V , = 3V UVLO AUXIN IN AUXIN Supply Current I 4 mA AUXIN V > V IN BUS BUS Leakage Current I V = 13.2V, V = 0 1 mA LEAK BUS IN BUS V = 13.2V, V > V , BUS BUS IN BUS Supply Current I 3 mA BUS V > V BUS AUXIN Maxim Integrated 2 www.maximintegrated.com