LTC4365 Overvoltage, Undervoltage and Reverse Supply Protection Controller FeaTuresDescripTion n Wide Operating Voltage Range: 2.5V to 34V The LTC®4365 protects applications where power supply n Overvoltage Protection to 60V input voltages may be too high, too low or even negative. n Reverse Supply Protection to –40V It does this by controlling the gate voltages of a pair of n LTC4365: Blocks 50Hz and 60Hz AC Power external N-channel MOSFETs to ensure that the output n LTC4365-1: Fast (1ms) Recovery from Fault stays within a safe operating range.The LTC4365 can n No Input Capacitor or TVS Required for Most withstand voltages between –40V and 60V and has an Applications operating range of 2.5V to 34V, while consuming only n Adjustable Undervoltage and Overvoltage 125µA in normal operation. Protection Range Two comparator inputs allow configuration of the over- n Charge Pump Enhances External N-Channel MOSFET voltage (OV) and undervoltage (UV) set points using an n Low Operating Current: 125µA external resistive divider. A shutdown pin provides external n Low Shutdown Current: 10µA control for enabling and disabling the MOSFETs as well n Compact 8-Lead, 3mm × 2mm DFN and as placing the device in a low current shutdown state. A TSOT-23 (ThinSOT™) Packages fault output provides status of the gate pin pulling low. A fault is indicated when the part is in shutdown or the input applicaTions voltage is outside the UV and OV set points. The LTC4365 has a 36ms turn-on delay that debounces n Portable Instrumentation live connections and blocks 50Hz to 60Hz AC power. For n Industrial Automation fast recovery after faults, the LTC4365-1 has a reduced n Laptops 1ms turn-on delay. n Automotive Surge Protection L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical applicaTion12V Automotive ApplicationLoad Protected from Reverse and Overvoltage at VIN V Si4946 IN VOUT UV = 3.5V 12V 3A 30V OV = 18V VIN GATE VALID VIN VOUT WINDOW LTC4365 V 510k OUT GND VOUT SHDN 1820k 10V/DIV UV FAULT VIN 243k –30V OV 4365 TA01b OV = 18V 1s/DIV 59k GND UV = 3.5V 4365 TA01a 4365fa For more information www.linear.com/LTC4365 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 Package Description Revision History Related Parts
