LT4356-1
LT4356-2

RECOMMENDED FOR NEW DESIGNS

Surge Stopper

Data Sheet (Rev. D) 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)
  • Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller (LT4356-2)
  • Adjustable Fault Timer
  • Controls N-channel MOSFET
  • Shutdown Pin Withstands –60V to 100V
  • Fault Output Indication
  • Guaranteed Operation to 125°C
  • Available in (4mm × 3mm) 12-Pin DFN, 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 LT4356 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 cool down 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
  • Intrinsic Safety Applications
LT4356-1
LT4356-2
Surge Stopper
LT4356-1-4356-2 Application Circuit LT4356-1-4356-2 Pin configuration LT4356-1-4356-2 Pin Configuration LT4356-1-4356-2 Pin Configuration LT4356-1-4356-2 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Application Note 1

Technical Articles 5

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
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Tools & Simulations

LTspice 4

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.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC1018B-A

LT4356-1 Demo | Overvoltage Protection Regulator with Auto-retry

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Product Details

DC1018B-A: Demo Board for the LT4356-1 and -2 Surge Stopper.

eval board
schematic 7
schematic 8
schematic 9
schematic 10
schematic 11
schematic 12
schematic 13
DC1018B-B

LT4356-2 Demo Board | Overvoltage Protection Regulator with Auto-retry, Auxiliary Amplifier remains on during Shutdown

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Features and Benefits

  • For Automotive Applications up to 3A
  • Triple Layout for D-Pak, D2-Pak or S-8 MOSFETs
  • 0.093-inch Turret Holes Accommodate 12 AWG Wire
  • LEDs Show Input, Outputs, Fault and Enable
  • Easily Modified for up to 20A

Product Details

Demonstration Circuit DC1018B-B showcases the LT4356-2 Surge Stopper in a 12V, 3A application. Input transients of up to 60V are limited to 16V at the output; sustained overvoltage conditions cause the limiter to trip off and retry after the overvoltage is removed.

LEDs indicate the presence of +12V input and output, as well as state of the fault output, FLT# and enable output, EN.

Input and output connections are made by 93 mil turrets which if removed, accommodate insertion of up to 12 gauge wires for in-situ testing.

Design files for this circuit board are available below.

Applications

  • Servers, Routers, Switches
  • Mass Storage
  • Fan Trays
  • Automotive Modules
DC1018B-A
LT4356-1 Demo | Overvoltage Protection Regulator with Auto-retry
DC1018B-A Demo Board DC1018B-A Demo Board DC1018B-A Demo Board DC1018B-A Demo Board DC1018B-A Demo Board DC1018B-B - Schematic
DC1018B-B
LT4356-2 Demo Board | Overvoltage Protection Regulator with Auto-retry, Auxiliary Amplifier remains on during Shutdown
DC1018B-B Demo Board DC1018B-B Demo Board DC1018B-B Demo Board DC1018B-B Demo Board DC1018B-B Demo Board DC1018B-B DC1018B-B - Schematic

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