LT4363 - High Voltage Surge Stopper with Current Limit
Features
- Withstands Surges Over 80V with VCC Clamp
- Wide Operating Voltage Range: 4V to 80V
- Adjustable Output Clamp Voltage
- Fast Overcurrent Limit: Less Than 5μs
- Reverse Input Protection to –60V
- Adjustable UV/OV Comparator Thresholds
- Low 7μA Shutdown Current
- Shutdown Pin Withstands –60V to 100V
- Adjustable Fault Timer
- Controls N-Channel MOSFET
- Less Than 1% Retry Duty Cycle During Faults, LT4363-2
- Available in 12-Pin (4mm × 3mm) DFN, 12-Pin MSOP or 16-Pin SO Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®4363 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in vehicles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value allowing the loads to continue functioning. The LT4363 also monitors the voltage drop between the SNS and OUT pins to protect against overcurrent faults. An internal amplifier limits the voltage across the current sense resistor to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. Before the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off. The LT4363-1 remains off until reset whereas the LT4363-2 restarts after a cool down period.
Two precision comparators can monitor the input supply for overvoltage (OV) and undervoltage (UV) conditions. When the potential is below the UV threshold, the external MOSFET is kept off. If the input supply voltage is above the OV threshold, the MOSFET is not allowed to turn back on. Back-to-back MOSFETs 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 during shutdown.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT4363CDE-1#PBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LT4363CDE-1#TRPBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LT4363CDE-2#PBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LT4363CDE-2#TRPBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LT4363CMS-1#PBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LT4363CMS-1#TRPBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LT4363CMS-2#PBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LT4363CMS-2#TRPBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LT4363CS-1#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LT4363CS-1#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LT4363CS-2#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LT4363CS-2#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LT4363HDE-1#PBF | 4x3 DFN-12 | DE/UE | H | 05-08-1695 | Yes |
| LT4363HDE-1#TRPBF | 4x3 DFN-12 | DE/UE | H | 05-08-1695 | Yes |
| LT4363HDE-2#PBF | 4x3 DFN-12 | DE/UE | H | 05-08-1695 | Yes |
| LT4363HDE-2#TRPBF | 4x3 DFN-12 | DE/UE | H | 05-08-1695 | Yes |
| LT4363HMS-1#PBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LT4363HMS-1#TRPBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LT4363HMS-2#PBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LT4363HMS-2#TRPBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LT4363HS-1#PBF | SO-16 | S | H | 05-08-1610 (S16) | Yes |
| LT4363HS-1#TRPBF | SO-16 | S | H | 05-08-1610 (S16) | Yes |
| LT4363HS-2#PBF | SO-16 | S | H | 05-08-1610 (S16) | Yes |
| LT4363HS-2#TRPBF | SO-16 | S | H | 05-08-1610 (S16) | Yes |
| LT4363IDE-1#PBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LT4363IDE-1#TRPBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LT4363IDE-2#PBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LT4363IDE-2#TRPBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LT4363IMS-1#PBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LT4363IMS-1#TRPBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LT4363IMS-2#PBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LT4363IMS-2#TRPBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LT4363IS-1#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LT4363IS-1#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LT4363IS-2#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LT4363IS-2#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LT4363MPMS-1#PBF | MS-12 | MS | MP | 05-08-1668 | Yes |
| LT4363MPMS-1#TRPBF | MS-12 | MS | MP | 05-08-1668 | Yes |
| LT4363MPMS-2#PBF | MS-12 | MS | MP | 05-08-1668 | Yes |
| LT4363MPMS-2#TRPBF | MS-12 | MS | MP | 05-08-1668 | Yes |
| LT4363MPS-1#PBF | SO-16 | S | MP | 05-08-1610 (S16) | Yes |
| LT4363MPS-1#TRPBF | SO-16 | S | MP | 05-08-1610 (S16) | Yes |
| LT4363MPS-2#PBF | SO-16 | S | MP | 05-08-1610 (S16) | Yes |
| LT4363MPS-2#TRPBF | SO-16 | S | MP | 05-08-1610 (S16) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
sales office or authorized distributor.Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1935A-A | LT4363-1 Demo Board: High Voltage Surge Stopper with Current Limit, Latch-Off Version | $75.00 | |
| DC1935A-B | LT4363-2 Demo Board: High Voltage Surge Stopper with Current Limit, Auto-Retry Version | $75.00 | |
| DC2062A-A | LT4363IDE-1 Demo Board: 12V System ISO-7637-2 Surge Stopper, Latch-Off Version | $75.00 | |
| DC2062A-B | LT4363IDE-2 Demo Board: 12V System ISO-7637-2 Surge Stopper, Auto-Retry Version | $75.00 | |
| DC2150A-C | 28V, 5A MIL-STD-1275D Surge Stopper [Featuring LTC4366HTS8-2 and LT4363HS-2] | $150.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT4363HDE-1#PBF | 4x3 DFN-12 | H | $4.49 | $3.14 | Yes | |
| LT4363HDE-1#TRPBF | 4x3 DFN-12 | H | $3.20 | Yes | ||
| LT4363HDE-2#PBF | 4x3 DFN-12 | H | $4.49 | $3.14 | Yes | |
| LT4363HDE-2#TRPBF | 4x3 DFN-12 | H | $3.20 | Yes | ||
| LT4363HMS-1#PBF | MS-12 | H | $4.49 | $3.14 | Yes | |
| LT4363HMS-1#TRPBF | MS-12 | H | $3.20 | Yes | ||
| LT4363HMS-2#PBF | MS-12 | H | $4.49 | $3.14 | Yes | |
| LT4363HMS-2#TRPBF | MS-12 | H | $3.20 | Yes | ||
| LT4363IDE-1#PBF | 4x3 DFN-12 | I | $4.07 | $2.85 | Yes | |
| LT4363IDE-1#TRPBF | 4x3 DFN-12 | I | $2.91 | Yes | ||
| LT4363IDE-2#PBF | 4x3 DFN-12 | I | $4.07 | $2.85 | Yes | |
| LT4363IDE-2#TRPBF | 4x3 DFN-12 | I | $2.91 | Yes | ||
| LT4363IMS-1#PBF | MS-12 | I | $4.07 | $2.85 | Yes | |
| LT4363IMS-1#TRPBF | MS-12 | I | $2.91 | Yes | ||
| LT4363IMS-2#PBF | MS-12 | I | $4.07 | $2.85 | Yes | |
| LT4363IMS-2#TRPBF | MS-12 | I | $2.91 | Yes | ||
| LT4363MPMS-1#PBF | MS-12 | MP | $10.63 | $7.44 | Yes | |
| LT4363MPMS-1#TRPBF | MS-12 | MP | $7.50 | Yes | ||
| LT4363MPMS-2#PBF | MS-12 | MP | $10.63 | $7.44 | Yes | |
| LT4363MPMS-2#TRPBF | MS-12 | MP | $7.50 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive/Avionic Surge Protection
- Hot Swap™/Live Insertion
- High Side Switch for Battery Powered Systems
- Intrinsic Safety Applications
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LT4363-1
LT4363-2
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
