LTC4362-1/LTC4362-2 - 1.2A Overvoltage/ Overcurrent Protector


  • 2.5V to 5.5V Operation
  • Overvoltage Protection Up to 28V
  • Internal 40mΩ N-Channel MOSFET and 31mΩ RSENSE
  • Avalanche Rated MOSFET Requires No Input Capacitor or TVS for Most Applications
  • <1μs Overvoltage Turn-Off, Gentle Shutdown
  • 2% Accurate 5.8V Overvoltage Threshold
  • 20% Accurate 1.5A Overcurrent Threshold
  • Input Withstands Up to ±25kV HBM ESD with 1μF COUT
  • Controlled Power-Up dV/dt Limits Inrush Current
  • Reverse Voltage Protection Driver
  • Low Current Shutdown
  • Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2) After Overcurrent
  • Available in 8-Lead DFN 2mm × 3mm Package

Typical Application

LTC4362 Typical Application
LTC4362 Typical Application


The LTC4362 monolithic overvoltage/overcurrent protector safeguards 2.5V to 5.5V systems from power supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports.

The LTC4362 controls an internal 40mΩ N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4362 turns off the MOSFET within 1μs, isolating downstream components from the input supply. In most applications, the LTC4362 rides through inductive cable transients without requiring transient voltage suppressors or other external components. An internal current sense resistor is used to implement overcurrent protection.

The LTC4362 has a delayed start-up at plug-in and controlled dV/dt ramp-up for inrush current limiting. A PWRGD pin provides power good monitoring for VIN. The LTC4362 features a soft-shutdown controlled by the ON pin and drives an optional external P-channel MOSFET for negative voltage protection. Following an overvoltage condition, the LTC4362 automatically restarts with a 130ms delay. After an overcurrent fault, the LTC4362-1 remains off while the LTC4362-2 automatically restarts after a 130ms delay.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4362CDCB-1#PBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362CDCB-1#TRMPBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362CDCB-1#TRPBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362CDCB-2#PBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362CDCB-2#TRMPBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362CDCB-2#TRPBF 2x3 DFN-8 DCB C 05-08-1718 Yes
LTC4362IDCB-1#PBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LTC4362IDCB-1#TRMPBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LTC4362IDCB-1#TRPBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LTC4362IDCB-2#PBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LTC4362IDCB-2#TRMPBF 2x3 DFN-8 DCB I 05-08-1718 Yes
LTC4362IDCB-2#TRPBF 2x3 DFN-8 DCB I 05-08-1718 Yes

LTC4362 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4362CDCB-1#PBF 2x3 DFN-8 C $2.29 Yes
LTC4362CDCB-1#TRMPBF 2x3 DFN-8 C $2.29 $1.65 Yes
LTC4362CDCB-1#TRPBF 2x3 DFN-8 C $2.29 $1.60 Yes
LTC4362CDCB-2#PBF 2x3 DFN-8 C $2.29 Yes
LTC4362CDCB-2#TRMPBF 2x3 DFN-8 C $2.29 $1.65 Yes
LTC4362CDCB-2#TRPBF 2x3 DFN-8 C $2.29 $1.60 Yes
LTC4362IDCB-1#PBF 2x3 DFN-8 I $2.51 Yes
LTC4362IDCB-1#TRMPBF 2x3 DFN-8 I $2.51 $1.81 Yes
LTC4362IDCB-1#TRPBF 2x3 DFN-8 I $2.51 $1.76 Yes
LTC4362IDCB-2#PBF 2x3 DFN-8 I $2.51 Yes
LTC4362IDCB-2#TRMPBF 2x3 DFN-8 I $2.51 $1.81 Yes
LTC4362IDCB-2#TRPBF 2x3 DFN-8 I $2.51 $1.76 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1575B LTC4362CDCB-2 Demo Board | Monolithic Overvoltage and Overcurrent Protector with Auto-Retry $50.00
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Click here to view our complete list of demo boards


  • USB Protection
  • Handheld Computers
  • Cell/Smart Phones
  • MP3/MP4 Players
  • Digital Cameras

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