LTC4364-1/LTC4364-2 Surge Stopper with Ideal Diode FEATURESDESCRIPTION n Wide Operating Voltage Range: 4V to 80V The LTC®4364 surge stopper with ideal diode controller n Withstands Surges Over 80V with VCC Clamp protects loads from high voltage transients. It limits and n Adjustable Output Clamp Voltage regulates the output during an overvoltage event, such n Ideal Diode Controller Holds Up Output Voltage as load dump in automobiles, by controlling the voltage During Input Brownouts drop across an external N-channel MOSFET pass device. n Reverse Input Protection to –40V The LTC4364 also includes a timed, current limited circuit n Reverse Output Protection to –20V breaker. In a fault condition, an adjustable fault timer must n Overcurrent Protection expire before the pass device is turned off. The LTC4364-1 n Low 10μA Shutdown Current at 12V latches off the pass device while the LTC4364-2 automati- n Adjustable Fault Timer cally restarts after a delay. The LTC4364 precisely monitors n 0.1% Retry Duty Cycle During Faults (LTC4364-2) the input supply for overvoltage (OV) and undervoltage n Available in 4mm × 3mm 14-Lead DFN, 16-Lead MSOP, (UV) conditions. The external MOSFET is held off in un- and 16-Lead SO Packages dervoltage and auto-retry is disabled in overvoltage. An integrated ideal diode controller drives a second MOS- APPLICATIONS FET to replace a Schottky diode for reverse input protec- n Automotive/Avionic Surge Protection tion and output voltage holdup. The LTC4364 controls the n Hot Swap/Live Insertion forward voltage drop across the MOSFET and minimizes n Redundant Supply ORing reverse current transients upon power source failure, n Output Port Protection brownout or input short. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIONOvervoltage Protector RegulatesOutput at 27V During Input Transient4A, 12V Overvoltage Output Regulator with Ideal DiodeWithstands 200V 1ms Transient at V 92V INPUT SURGE CTMR = 6.8µF IN ILOAD = 0.5A VIN FDB33N25 FDB3682 10mΩ V V OUT 20V/DIV IN CLAMPED 12V + AT 27V 12V 383k 22µF CMZ5945B 27V CLAMP (ADJUSTABLE) 2.2k 6.8nF 10Ω V 68V OUT 12V 20V/DIV 50ms/DIV 4364 TA01b VCC HGATE SOURCE DGATE SENSE OUT 102k SHDN FB Ideal Diode Holds Up Output UV UV 4.99k During Input Short 6V 90.9k LTC4364 12V C OV LOAD = 6300µF OV ENOUT ENABLE V INPUT SHORTED I 60V IN LOAD = 0.5A FLT FAULT TO GND 10k 10V/DIV GND TMR 436412 TA01a 0.22µF V 12V OUTPUT HELD UP OUT 10V/DIV 1ms/DIV 4364 TA01c 436412f 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
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