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LTC436x Series Overvoltage / Overcurrent Protection Controllers

Linear Technology's LTC436x family features fast shutdown to protect low voltage electronics

Linear Technology's LTC436x overvoltage protection family brings a number of advantages to low voltage, portable applications. All devices feature 2% accurate 5.8V overvoltage protection with fast shutdown of 1μs to protect low voltage electronics from damage. High input overvoltage protection of 80V with the LTC4360 and LTC4361 and 28V with the LTC4362 provides protection from high voltage transients without requiring transient voltage suppressors or input capacitors in most applications. All devices feature a shutdown mode that gently puts the device into a low power mode, regardless of the input voltage, providing a low power dissipation mode for power-critical portable applications. Overvoltage / Overcurrent Protection Controller

  • Overview
  • Features
  • Applications
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Overview

LTC4360
The LTC4360 overvoltage protection controller is recommended for applications that do not require overcurrent protection. While offering many of the same features as the LTC4361, the two LTC4360 versions are differentiated by pin functions. The LTC4360-1 features soft shutdown control (ON# pin) with low shutdown current of 1.5μA, while the LTC4360-2 can drive an optional external P-channel MOSFET for negative voltage protection.

LTC4361
The LTC4361 is a 2.5V to 5.5V overvoltage and overcurrent protection controller designed to safeguard low voltage, portable electronics from damaging input voltage transients and current surges. The LTC4361 utilizes a 2% accurate 5.8V overvoltage threshold to detect an overvoltage event and respond quickly 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 external components at the input. In addition, the LTC4361 monitors voltage drop across a current sense resistor at the input of the circuit to protect against overcurrent faults.

LTC4362
The LTC4362 is a 1.2A overvoltage/overcurrent protector that includes an internal 40mΩ N-channel MOSFET and 31mΩ current sense resistor in series with the input power supply. The internal avalanche rated MOSFET can absorb a single pulse avalanche energy of 10mJ, eliminating the need for an input capacitor or TVS in most applications. High overvoltage threshold accuracy of 2% and fast shutdown within 1μs protects low voltage electronics from damage. In addition, the LTC4362 monitors the voltage drop across an internal current sense resistor to provide a 20% accurate, 1.5A overcurrent threshold. The input can also withstand up to ±25kV of ESD (HBM) with a 1μF capacitor on the output.
Features

LTC4360
  • 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
  • <1μs overvoltage turn-off, gentle shutdown
  • Adjustable power-up dV/dt limits inrush
  • Reverse voltage protection
  • Low current shutdown

LTC4361
  • 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
  • Adjustable power-up dV/dt limits inrush current
  • Reverse voltage protection driver

LTC4362
  • Overvoltage protection up to 28V
    • Internal 40mΩ N-channel MOSFET with 31mΩ RSENSE
    • 2% accurate 5.8V overvoltage threshold
  • 20% accurate, 1.5A overcurrent threshold
  • Reverse voltage protection
  • Low current shutdown (1.5μA)
Applications

LTC4360 / LTC4361 / LTC4362
  • USB protection
  • Handheld computers
  • MP3/MP4 players
  • Cell/smartphones
  • Digital cameras
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LTC4360
Digi-Key P/N Manufacturer P/N Description
LTC4360CSC8-1#TRMPBFCT-ND LTC4360CSC8-1#TRMPBF IC OVERVOLTAGE PROT CONT SC70-8
LTC4360CSC8-2#TRMPBFCT-ND LTC4360CSC8-2#TRMPBF IC OVERVOLTAGE PROT CONT SC70-8
LTC4360ISC8-1#TRMPBFCT-ND LTC4360ISC8-1#TRMPBF IC OVERVOLTAGE PROT CONT SC70-8
LTC4360ISC8-2#TRMPBFCT-ND LTC4360ISC8-2#TRMPBF IC OVERVOLTAGE PROT CONT SC70-8
Datasheet

LTC4361
Digi-Key P/N Manufacturer P/N Description
LTC4361CDC-2#TRMPBFCT-ND LTC4361CDC-2#TRMPBF IC OVERVOLTAGE/CUR PROT 8-DFN
LTC4361CTS8-1#TRMPBFCT-ND LTC4361CTS8-1#TRMPBF IC OVERVOLTAGE/CUR PROT TSOT23-8
LTC4361CTS8-2#TRMPBFCT-ND LTC4361CTS8-2#TRMPBF IC OVERVOLTAGE/CUR PROT TSOT23-8
LTC4361ITS8-1#TRMPBFCT-ND LTC4361ITS8-1#TRMPBF IC OVERVOLT PROT CONT TSOT23-8
LTC4361ITS8-2#TRMPBFCT-ND LTC4361ITS8-2#TRMPBF IC OVERVOLT PROT CONT TSOT23-8
LTC4361IDC-2#TRMPBFCT-ND LTC4361IDC-2#TRMPBF IC OVERVOLTAGE PROT CONT 8-DFN
LTC4361CDC-1#TRMPBFCT-ND LTC4361CDC-1#TRMPBF IC OVERVOLTAGE/CUR PROT 8-DFN
LTC4361IDC-1#TRMPBFCT-ND LTC4361IDC-1#TRMPBF IC OVERVOLTAGE PROT CONT 8-DFN
Datasheet

LTC4362
Digi-Key P/N Manufacturer P/N Description
LTC4362CDCB-1#TRMPBFCT-ND LTC4362CDCB-1#TRMPBF IC OVP/OVC PROTECT LATCHOFF 8DFN
LTC4362CDCB-2#TRMPBFCT-ND LTC4362CDCB-2#TRMPBF IC OVERVOLT/OVERCUR PROT 8-DFN
LTC4362IDCB-1#TRMPBFCT-ND LTC4362IDCB-1#TRMPBF IC OVP/OVC PROTECT LATCHOFF 8DFN
LTC4362IDCB-2#TRMPBFCT-ND LTC4362IDCB-2#TRMPBF IC OVERVOLT/OVERCUR PROT 8-DFN
Datasheet