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

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.

Features
  • 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
Applications
  • USB Protection
  • Handheld Computers
  • Cell/Smart Phones
  • MP3/MP4 Players
  • Digital Cameras
Packaging
LTC4361 Package Drawing
LTC4361 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4361CDC-1#PBF2x2 DFN-8C$2.00
LTC4361CDC-1#TRMPBF2x2 DFN-8C$2.00$1.45
LTC4361CDC-1#TRPBF2x2 DFN-8C$2.00$1.40
LTC4361CDC-2#PBF2x2 DFN-8C$2.00
LTC4361CDC-2#TRMPBF2x2 DFN-8C$2.00$1.45
LTC4361CDC-2#TRPBF2x2 DFN-8C$2.00$1.40
LTC4361CTS8-1#PBFSOT-23C$2.00
LTC4361CTS8-1#TRMPBFSOT-23C$2.00$1.45
LTC4361CTS8-1#TRPBFSOT-23C$2.00$1.40
LTC4361CTS8-2#PBFSOT-23C$2.00
LTC4361CTS8-2#TRMPBFSOT-23C$2.00$1.45
LTC4361CTS8-2#TRPBFSOT-23C$2.00$1.40
LTC4361HDC-1#PBF2x2 DFN-8H$2.53
LTC4361HDC-1#TRMPBF2x2 DFN-8H$2.53$1.82
LTC4361HDC-1#TRPBF2x2 DFN-8H$2.53$1.77
LTC4361HDC-2#PBF2x2 DFN-8H$2.53
LTC4361HDC-2#TRMPBF2x2 DFN-8H$2.53$1.82
LTC4361HDC-2#TRPBF2x2 DFN-8H$2.53$1.77
LTC4361HTS8-1#PBFSOT-23H$2.53
LTC4361HTS8-1#TRMPBFSOT-23H$2.53$1.82
LTC4361HTS8-1#TRPBFSOT-23H$2.53$1.77
LTC4361HTS8-2#PBFSOT-23H$2.53
LTC4361HTS8-2#TRMPBFSOT-23H$2.53$1.82
LTC4361HTS8-2#TRPBFSOT-23H$2.53$1.77
LTC4361IDC-1#PBF2x2 DFN-8I$2.20
LTC4361IDC-1#TRMPBF2x2 DFN-8I$2.20$1.59
LTC4361IDC-1#TRPBF2x2 DFN-8I$2.20$1.54
LTC4361IDC-2#PBF2x2 DFN-8I$2.20
LTC4361IDC-2#TRMPBF2x2 DFN-8I$2.20$1.59
LTC4361IDC-2#TRPBF2x2 DFN-8I$2.20$1.54
LTC4361ITS8-1#PBFSOT-23I$2.20
LTC4361ITS8-1#TRMPBFSOT-23I$2.20$1.59
LTC4361ITS8-1#TRPBFSOT-23I$2.20$1.54
LTC4361ITS8-2#PBFSOT-23I$2.20
LTC4361ITS8-2#TRMPBFSOT-23I$2.20$1.59
LTC4361ITS8-2#TRPBFSOT-23I$2.20$1.54
Demo Boards
Part NumberDescriptionPrice
DC1506ALTC4361-1/LTC4361-2 Overvoltage/Overcurrent Protection Controller with Latchoff/Auto-Retry$50.00
Datasheet
Reliability Data
Product Selector Card
LT Journal
Press Release
CAD Symbol
LTspice
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Datasheet
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