High-Voltage, Overvoltage/ MAX6399 Undervoltage, Protection Switch Controller General Description Benefits and Features The MAX6399 is a small overvoltage and undervoltage High-Voltage Capability (72V) Allows Direct Monitoring, protection circuit. The device can monitor a DC-DC out- Ensuring Reliable System Operation in Automotive and put voltage and quickly disconnect the power source Industrial Applications from the DC-DC input load when an overvoltage condi- Wide Supply Voltage Range (5.75V to 72V) tion occurs. A power-OK output signals when the Specified from -40C to +125C DC-DC input voltage falls below an adjustable thresh- Adjustable DC-DC Input Undervoltage-Threshold old. This controller architecture provides the ability to Power-OK Output size the external n-channel MOSFET to meet specific Adjustable DC-DC Output Overvoltage Thresholds load current requirements. Integrated Protection Features Improve When the DC-DC monitored output voltage is below the System Reliability user-adjustable overvoltage threshold, the GATE output Internal Charge Pump Ensures n-Channel MOSFET of the MAX6399 goes high to enhance the n-channel is Fully Enhanced During Normal Operation MOSFET. The MAX6399 offers internal charge-pump (V = 10V) GS circuitry that allows the GATE voltage to be 10V above Fast GATE Shutoff During Overvoltage with 20mA the input voltage (V = 10V) to fully enhance the GS Sink Capability external n-channel MOSFET, thus minimizing the drain- Latches Off External n-Channel MOSFET During to-source resistance. High-Voltage Transients When the monitored output voltage rises above the Overtemperature-Shutdown Protection user-adjusted overvoltage threshold, the GATE output rapidly pulls low to shut off the MOSFET. The MOSFET remains latched off until either the MAX6399 input power or SHDN input is cycled. The MAX6399 includes Ordering Information a logic-low shutdown input that disables the GATE. An internal overtemperature detector also disables the PART PIN-PACKAGE TOP MARK gate when the MAX6399 temperature reaches the MAX6399ATA-T 8 TDFN ANE thermal-shutdown threshold. The device operates over a wide supply voltage range (5.75V to 72V) and is offered in a small TDFN package, fully specified from -40C to +125C. Applications Networking Telecom Typical Operating Circuit Server RAID DC-DC CONVERTER Pin Configuration IN OUT EN GND TOP VIEW LOAD 8 7 6 5 GATE 12V IN OUT MAX6399 MAX6399 SHDN OUT SET *EP SET 3.3V 12 3 4 POK GND TDFN *EXPOSED PAD. CONNECT TO GND. 19-3655 Rev 2 4/15 IN OUT SET OUT SHDN SET GATE GND POKHigh-Voltage, Overvoltage/ MAX6399 Undervoltage, Protection Switch Controller Absolute Maximum Ratings IN, GATE, OUT .......................................................-0.3V to +80V Continuous Power Dissipation (T = +70C) A SHDN.............................................................-0.3V to (IN + 0.3V) 8-Pin TDFN (derate 18.2mW/C above +70C) .........1455mW OUT ........................................................................-0.3V to +80V Operating Temperature Range .........................-40C to +125C GATE to OUT..........................................................-0.3V to +20V Junction Temperature......................................................+150C OUT SET, SET, POK ..............................................-0.3V to +12V Storage Temperature Range .............................-65C to +150C Maximum Current (All pins) ................................................50mA Lead Temperature Range................................................+300C 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. Electrical Characteristics (V = 14V C = 6000pF, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) IN GATE A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V 5.75 72.00 V IN SHDN = high 100 130 IN Supply Current I A IN SHDN = low 10 22 IN Undervoltage Lockout V rising, enables GATE 4.68 5 5.50 V IN IN Undervoltage Lockout V falling, GATE off 155 mV IN Hysteresis SET Threshold Voltage V With respect to GND, SET rising 0.480 0.5 0.517 V TH (SET) SET Threshold Hysteresis V 5 % V HYST TH SET Input Current I -50 +50 nA SET Startup Response Time t SHDN rising (Note 2) 100 s START GATE rising from GND to V + 8V, OUT GATE Rise Time 1ms C = 6000pF, OUT = GND GATE SET rising from V - 100mV to TH SET to GATE Prop Delay t 0.5 s OV V + 100mV TH V + V + V + IN IN IN V = V = 5V, R to IN = 1M OUT IN GATE 3.6V 3.8V 4.0V GATE Output-Voltage High V V OH V + V + V + IN IN IN V = V V 14V, R to IN = 1M OUT IN IN GATE 15V 10V 10.7V GATE Output-Voltage Low V GATE sinking 20mA, V = GND 0.3 V OL OUT SET GATE Charge-Pump Current I GATE = GND 75 A GATE GATE to OUT Clamp Voltage V 13.8 18.0 V CLMP SHDN Logic-High Input Voltage V 1.4 V IH SHDN Logic-Low Input Voltage V 0.4 V IL V = 2V, SHDN is internally pulled SHDN SHDN Input Pulldown Current 1A down to GND Thermal-Shutdown Temperature +150 C (Note 3) Thermal-Shutdown Hysteresis 20 C POWER-OK (POK) V TH OUT SET Threshold OUT SET rising 1.205 1.23 1.258 V (OUT SET) www.maximintegrated.com Maxim Integrated 2