LT4356MP-1
LT4356MP-2

RECOMMENDED FOR NEW DESIGNS

Surge Stopper

Data Sheet Product Selection Table
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Overview

  • Stops High Voltage Surges
  • Adjustable Output Clamp Voltage
  • Overcurrent Protection
  • Wide Operation Range: 4V to 80V
  • Reverse Input Protection to –60V
  • Low 7μA Shutdown Current, LT4356-1
  • Adjustable Fault Timer
  • Controls N-channel MOSFET
  • Shutdown Pin Withstands –60V to 100V
  • Fault Output Indication
  • Guaranteed Operation –55°C to 125°C
  • Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller
  • Available in 10-Pin MSOP or 16-Pin SO Packages

The LT4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356MP also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifier limits the current sense voltage to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power-down. If the condition persists, the MOSFET is turned off. After a cooldown period, the GATE pin pulls up turning on the MOSFET again.

The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor.

Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. A shutdown pin reduces the quiescent current to less than 7μA for the LT4356-1 during shutdown. The LT4356-2 differs from the LT4356-1 during shutdown by reducing the quiescent current to 60μA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator.

 

LT4356-1

LT4356MP-1

LT4356-2

LT4356MP-2

LT4356-3

LT4356MP-3
Low Current Shutdown 7uA 60uA 7uA
Aux Amp In Shutdown OFF Always Alive OFF
Fault Retry Retry Retry Latch Off
Packages DFN-12, MS-10, SO-16 DFN-12, SO-16 DFN-12, MS-10, SO-16
Temp Grades C, I, H, MP C, I, H, MP C, I, H, MP


Applications

  • Automotive/Avionic Surge Protection
  • Hot Swap/Live Insertion
  • High Side Switch for Battery Powered Systems
LT4356MP-1
LT4356MP-2
Surge Stopper
4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LT4356-3
LT4356MP-3
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Fault Latchoff
LT4356-1
LT4356-2
RECOMMENDED FOR NEW DESIGNS Surge Stopper
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT4356-1
  • LT4356-2
  • LT4356-3
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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