LTC4361-1/LTC4361-2 - Overvoltage/Overcurrent Protection Controller


  • 2.5V to 5.5V Operation
  • Overvoltage Protection Up to 80V
  • No Input Capacitor or TVS Required for Most Applications
  • 2% Accurate 5.8V Overvoltage Threshold
  • 10% Accurate 50mV Overcurrent Circuit Breaker
  • <1μs Overvoltage Turn-Off, Gentle Shutdown
  • Controls N-Channel MOSFET
  • Adjustable Power-Up dV/dt Limits Inrush Current
  • Reverse Voltage Protection
  • Power Good Output
  • Low Current Shutdown
  • Latchoff (LTC4361-1) or Auto-Retry (LTC4361-2) After Overcurrent
  • Available in 8-Lead ThinSOT™ and 8-Lead (2mm × 2mm) DFN Packages

Typical Application

LTC4361 Typical Application
LTC4361 Typical Application


The LTC4361 overvoltage/overcurrent protection controller safeguards 2.5V to 5.5V systems from input supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports.

The LTC4361 controls an external N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4361 turns off the MOSFET within 1μs, isolating downstream components from the input supply. Inductive cable transients are absorbed by the MOSFET and load capacitance. In most applications, the LTC4361 provides protection from transients up to 80V without requiring transient voltage suppressors or other external components.

The LTC4361 has a delayed start-up and adjustable dV/dt ramp-up for inrush current limiting. A PWRGD pin provides power good monitoring for VIN. The LTC4361 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 LTC4361 automatically restarts with a start-up delay. After an overcurrent fault, the LTC4361-1 remains off while the LTC4361-2 automatically restarts after a 130ms start-up 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
LTC4361CDC-1#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CDC-1#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CDC-1#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CDC-2#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CDC-2#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CDC-2#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC4361CTS8-1#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361CTS8-1#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361CTS8-1#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361CTS8-2#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361CTS8-2#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361CTS8-2#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC4361HDC-1#PBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HDC-1#TRMPBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HDC-1#TRPBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HDC-2#PBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HDC-2#TRMPBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HDC-2#TRPBF 2x2 DFN-8 DC8 H 05-08-1719 Yes
LTC4361HTS8-1#PBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361HTS8-1#TRMPBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361HTS8-1#TRPBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361HTS8-2#PBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361HTS8-2#TRMPBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361HTS8-2#TRPBF SOT-23 TS8 H 05-08-1637 Yes
LTC4361IDC-1#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361IDC-1#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361IDC-1#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361IDC-2#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361IDC-2#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361IDC-2#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC4361ITS8-1#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC4361ITS8-1#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC4361ITS8-1#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC4361ITS8-2#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC4361ITS8-2#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC4361ITS8-2#TRPBF SOT-23 TS8 I 05-08-1637 Yes

LTC4361 Package Drawing
LTC4361 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
LTC4361CDC-1#PBF 2x2 DFN-8 C $2.00 Yes
LTC4361CDC-1#TRMPBF 2x2 DFN-8 C $2.00 $1.45 Yes
LTC4361CDC-1#TRPBF 2x2 DFN-8 C $2.00 $1.40 Yes
LTC4361CDC-2#PBF 2x2 DFN-8 C $2.00 Yes
LTC4361CDC-2#TRMPBF 2x2 DFN-8 C $2.00 $1.45 Yes
LTC4361CDC-2#TRPBF 2x2 DFN-8 C $2.00 $1.40 Yes
LTC4361CTS8-1#PBF SOT-23 C $2.00 Yes
LTC4361CTS8-1#TRMPBF SOT-23 C $2.00 $1.45 Yes
LTC4361CTS8-1#TRPBF SOT-23 C $2.00 $1.40 Yes
LTC4361CTS8-2#PBF SOT-23 C $2.00 Yes
LTC4361CTS8-2#TRMPBF SOT-23 C $2.00 $1.45 Yes
LTC4361CTS8-2#TRPBF SOT-23 C $2.00 $1.40 Yes
LTC4361HDC-1#PBF 2x2 DFN-8 H $2.53 Yes
LTC4361HDC-1#TRMPBF 2x2 DFN-8 H $2.53 $1.82 Yes
LTC4361HDC-1#TRPBF 2x2 DFN-8 H $2.53 $1.77 Yes
LTC4361HDC-2#PBF 2x2 DFN-8 H $2.53 Yes
LTC4361HDC-2#TRMPBF 2x2 DFN-8 H $2.53 $1.82 Yes
LTC4361HDC-2#TRPBF 2x2 DFN-8 H $2.53 $1.77 Yes
LTC4361HTS8-1#PBF SOT-23 H $2.53 Yes
LTC4361HTS8-1#TRMPBF SOT-23 H $2.53 $1.82 Yes
LTC4361HTS8-1#TRPBF SOT-23 H $2.53 $1.77 Yes
LTC4361HTS8-2#PBF SOT-23 H $2.53 Yes
LTC4361HTS8-2#TRMPBF SOT-23 H $2.53 $1.82 Yes
LTC4361HTS8-2#TRPBF SOT-23 H $2.53 $1.77 Yes
LTC4361IDC-1#PBF 2x2 DFN-8 I $2.20 Yes
LTC4361IDC-1#TRMPBF 2x2 DFN-8 I $2.20 $1.59 Yes
LTC4361IDC-1#TRPBF 2x2 DFN-8 I $2.20 $1.54 Yes
LTC4361IDC-2#PBF 2x2 DFN-8 I $2.20 Yes
LTC4361IDC-2#TRMPBF 2x2 DFN-8 I $2.20 $1.59 Yes
LTC4361IDC-2#TRPBF 2x2 DFN-8 I $2.20 $1.54 Yes
LTC4361ITS8-1#PBF SOT-23 I $2.20 Yes
LTC4361ITS8-1#TRMPBF SOT-23 I $2.20 $1.59 Yes
LTC4361ITS8-1#TRPBF SOT-23 I $2.20 $1.54 Yes
LTC4361ITS8-2#PBF SOT-23 I $2.20 Yes
LTC4361ITS8-2#TRMPBF SOT-23 I $2.20 $1.59 Yes
LTC4361ITS8-2#TRPBF SOT-23 I $2.20 $1.54 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
DC1506A LTC4361-1/LTC4361-2 Overvoltage/Overcurrent Protection Controller with Latchoff/Auto-Retry $50.00
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  • USB Protection
  • Handheld Computers
  • Cell/Smart Phones
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