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Overview
Features and Benefits
- 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
Product Details
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 |
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| 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
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Part#
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# of Channels
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Comments
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Ishutdown (typ)
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Vin Range
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1
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Ride-through protection, Adjustable output-clamp and circuit-breaker with timer, Shutdown mode, Latc
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7µ
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4V to 80V
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1
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Ride-through protection, Adjustable output-clamp and circuit-breaker with timer, -55C to 125C Operat
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7µ
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4V to 80V
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Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
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R568 Reliability Data3/23/2018
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DC1018B-A - Demo Manual11/13/2009
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DC1018B-B - Demo Manual11/13/2009
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Hot Swap Controllers8/2/2023
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Surge Stoppers6/22/2017
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100V Surge Stopper Protects Components from 300V Transients10/1/2012 LT Journal
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Unique Analog Multiplier Continuously Monitors Instantaneous Power and Simplifies Design of Power Control Loops7/1/2010 LT Journal
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Surge Stopper IC Simplifies Design of Intrinsic Safety Barrier for Electronics Destined for Hazardous Environments9/1/2009 LT Journal
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6-Input Supervisors Offer Accurate Monitoring and 125°C Operation3/1/2008 LT Journal
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Surge Stopper Protects Sensitive Electronics from High Voltage Transients1/1/2008 LT Journal
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
LTspice Simulations
Models for the following parts are available in LTspice:
LT4356-1
LT4356-2
LT4356-3
Product Recommendations
LT4356-1 Companion Parts
Recommended Related Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
PCN-PDN Information
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Support & Discussions
LT4356-1 Discussions
Sample & Buy
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Buy Now Pricing
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.