Overvoltage Surge Protectors LT4356 Surge Stopper, Regulates Overvoltage and Overcurrent Surges 10mΩ VIN 12V VOUT IRFR2407 80V INPUT SURGE 10Ω VCC 383k SNS GATE 59k OUT VIN 20V/DIV FB SHDN DC-DC CONVERTER LT4356 100k EN UNDERVOLTAGE AOUT VCC 4.99k IN+ GND SHDN GND FLT TMR 12V 16V CLAMP VOUT 20V/DIV 12V FAULT 100ms/DIV 0.1μF Features n n n n n n n n Wide Operating Range: 4V to 80V Adjustable Output Clamp Voltage Reverse Input Protection to –60V Adjustable Fault Timer Overcurrent Protection Inrush Limiting Auxiliary Amplifier –40°C to 125°C Operation LT4356-1 LT4356-2 LT4356-3 Shutdown Current 7μA 60μA 7μA Aux. Amp in Shutdown OFF ON OFF Fault Retry Temperature Grades Packages Retry Retry Latchoff C, I, H, MP C, I, H, MP C, I, H 4 × 3 DFN-12 MSOP-10 SO-16 4 × 3 DFN-12 SO-16 4 × 3 DFN-12 MSOP-10 SO-16 LTC4365 UV, OV and Reverse Supply Protection Controller VIN OPERATING RANGE: 2.5V TO 34V PROTECTS 60V TO –40V VOUT 30V UV = 3.5V OV = 18V VIN VOUT VOUT GATE NO TVS REQUIRED VIN VOUT LTC4365 ADJUSTABLE 0V/UV THRESHOLDS SHDN UV OV FAULT GND Valid Window GND 10V/DIV VIN –30V 1s/DIV Features n n n n n Low Operating Current: 125µA Low Shutdown Current: 10µA Blocks 50Hz and 60Hz AC Power –40°C to 125°C Operation 8-Lead, 3mm × 2mm DFN and TSOT-23 Packages 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. LTC4360/LTC4361/LTC4362 Overvoltage/Overcurrent Protection Controllers VIN 5V 0.025Ω VIN COUT GATE NO TVS REQUIRED Output Protected from Overvoltage at Input VOUT 5V 1.5A Si1470DH OUT SENSE IN VOUT VIN, VOUT 5V/DIV LTC4361 ON PWRGD VGATE 10V/DIV GND 0.5μs/DIV The LTC®4360/LTC®4361/LTC®4362 are overvoltage protection devices designed to safeguard low voltage, portable electronics from damaging input voltage transients and current surges. The LTC4360/LTC4361 utilize a 2% accurate 5.8V overvoltage threshold to detect an overvoltage event and responds within 1µs to isolate the downstream components from the input. Overvoltage protection of up to 80V can be achieved with this simple IC/MOSFET solution without the need for additional protection components. In addition the LTC4361 offers a 10% accurate overcurrent circuit breaker. The LTC4362 is a 1.2A overvoltage/overcurrent protector that includes an internal 40mΩ N-channel MOSFET and current sense resistor in series with the input power supply. All three products offer a GATEP output pin for controlling an additional P-channel MOSFET to provide negative input voltage protection. Applications n n n n USB Protection Cell/Smart Phones MP3/MP4 Players Digital Cameras LTC4360-1 Overvoltage Protection Controller Input Voltage Range LTC4360-2 Overvoltage Protection Controller LTC4361-1/-2 Overvoltage/ Overcurrent Protection Controller LTC4362-1/-2 Overvoltage/ Overcurrent Protector 2.5V to 28V 2.5V to 80V 2.5V to 80V 2.5V to 80V 5.8V 5.8V 5.8V 5.8V External External External Internal, 40mΩ Switch Reverse Voltage Protection No Yes Yes Yes Overcurrent Protection No No Yes, Adjustable Yes, 1.5A Overcurrent Fault Retry – – Latchoff/ Auto-Retry Latchoff/ Auto-Retry Overvoltage Trip Level N-Channel MOSFET Low Current Shutdown Yes No Yes Yes Power Good Output Yes Yes Yes Yes SC70-8 SC70-8 TSOT-8 2 × 2 DFN-8 2 × 3 DFN-8 Packages WALL ADAPTOR AC/DC RIN LIN MOBILE DEVICE IN IN OUT OUT + LTC4362 COUT LOAD GND CABLE www.linear.com/4356 n 1-800-4-LINEAR 0710A