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Analog Devices Inc. LT4363CMS-2#PBF
- Part No.:
- LT4363CMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4363CMS-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 12-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
LT4363CMS-2#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during overvoltage transients up to 150V, limits current via 50mV SNS–OUT sense threshold, features adjustable UV/OV comparators (1.275V threshold), and implements auto-retry fault recovery with <2% duty cycle. It protects industrial power supplies and avionic systems against 80V surges while maintaining load operation.
For engineers reviewing the LT4363CMS-2#PBF datasheet, LT4363CMS-2#PBF pinout, LT4363CMS-2#PBF application, or LT4363CMS-2#PBF equivalent, key selection criteria include its 4V–80V operating range, 12-lead MSOP package, LT4363-2 auto-restart behavior, 7µA shutdown current, and precise 50mV overcurrent sensing - all critical for hot-swap and intrinsic safety designs.
Technical Context
The LT4363CMS-2#PBF integrates dual precision comparators for independent UV (1.275V) and OV (1.275V) monitoring, with hysteresis of 12mV (UV) and 7.5mV (OV). Its gate driver delivers up to 13V above OUT with 14V clamp protection and supports fast turn-off propagation delays: 0.25µs (OV), 1µs (OC), and 2µs (UV).
It uses a VDS-adaptive fault timer: TMR charging current scales from 4µA to 50µA in overvoltage and 8µA to 260µA in overcurrent, enabling SOA-optimized timing. The LT4363-2 variant automatically restarts after cool-down (TMR falls to 0.5V), unlike the latch-off LT4363-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input - enables direct use in 12V/24V/48V industrial and automotive systems without pre-regulation. |
| Overcurrent Sense Threshold | 50mV (SNS–OUT), reduced to 25mV when OUT < 2V - ensures accurate current limiting across normal and severe short-circuit conditions. |
| UV/OV Comparator Threshold | 1.275V ±25mV - provides precise, temperature-stable enable/disable control for input supply sequencing. |
| Shutdown Current | <7µA - allows battery-backed or energy-sensitive systems to maintain ultra-low quiescent power during standby. |
| Fault Timer Early Warning | TMR = 1.275V triggers FLT low - gives system firmware time to save state before forced shutdown. |
| Auto-Restart Behavior | LT4363-2 cools down then retries at TMR = 0.5V - eliminates manual reset requirement in transient-prone environments. |
| GATE Drive Voltage Range | 10V to 13V above OUT - ensures robust N-MOSFET enhancement across full VDS range, including high-side configurations. |
Pinout & Package
LT4363CMS-2#PBF is housed in a 12-lead plastic MSOP package (4.0mm × 3.0mm × 1.1mm), RoHS-compliant, with exposed thermal pad not connected internally. Pin 1 marked by dot; pins 7 and 12 are GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback Input | Connects to resistive divider from OUT to GND; regulates output to 1.275V reference during overvoltage. |
| OUT | Output Sense | Senses source voltage of external N-MOSFET; used with SNS to measure current and set VDS-dependent timer current. |
| SNS | Current Sense Input | Monitors voltage drop across external sense resistor; controls GATE to clamp ΔVSNS at 50mV. |
| GATE | MOSFET Gate Driver | Drives external N-MOSFET gate with charge-pump-assisted 13V swing above OUT; clamped at 14V for fault protection. |
| VCC | Supply Input | Accepts 4V–80V input; withstands –60V reverse bias - supports reverse-battery and surge-hardened inputs. |
| SHDN | Shutdown Control | Pulled low (<0.4V) to enter 7µA shutdown; tolerates –60V to +100V - enables robust remote control in noisy environments. |
| UV | Undervoltage Input | Keeps GATE off until UV ≥1.275V; hysteresis = 12mV - prevents chatter during brown-out recovery. |
| OV | Overvoltage Input (LT4363-2 only) | Inhibits retry if OV >1.275V - blocks motorboating during sustained overvoltage events. |
| TMR | Fault Timer Capacitor Node | Charged by VDS-scaled current; thresholds at 1.275V (FLT warning), 1.375V (MOSFET off), 0.5V (LT4363-2 restart). |
| FLT | Fault Output | Open-collector NPN pulls low at TMR = 1.275V - signals impending shutdown to host controller or status LED. |
| ENOUT | Enable Output | Open-collector indicates MOSFET fully on (OUT within 0.5V of VCC and >3V above GND) - confirms healthy pass device operation. |
| GND | Ground Reference | Primary return path for internal amplifiers, comparators, and logic; pins 7 and 12 are bonded to die ground. |
Key Features
| Feature | Design Value |
|---|---|
| VDS-adaptive fault timer | Timer current scales with (VCC – OUT) - dynamically optimizes MOSFET safe operating area during overvoltage/overcurrent faults. |
| Auto-retry with cool-down | LT4363-2 restarts only after TMR discharges to 0.5V and MOSFET thermally recovers - prevents thermal runaway in repeated fault scenarios. |
| Reverse input protection support | SHDN, UV, OV pins tolerate –60V - enables back-to-back N-MOSFET configuration replacing Schottky diodes, reducing forward drop by >0.3V. |
| Precision 50mV current limit | Active servo loop maintains ΔVSNS = 50mV (or 25mV during severe shorts) - delivers consistent current limiting independent of temperature or supply variation. |
| Fast fault response | 0.25µs OV turn-off, 1µs OC turn-off - minimizes energy dissipation in external MOSFET during transient events. |
Applications
| Avionic Power Protection | Industrial Hot-Swap Module |
|---|---|
Use Scenario: Aircraft power distribution systems exposed to load dump surges exceeding 100V and reverse polarity events. IC Role / Device Role / Timing Role: Surge stopper controlling high-side N-MOSFET to clamp regulated output at 27V during 80V transients; monitors UV/OV for sequenced startup. Use Value: Maintains uninterrupted operation of flight-critical avionics during MIL-STD-704F transients while limiting MOSFET SOA stress via adaptive TMR current. |
Use Scenario: Backplane insertion of line cards into live 48V telecom or server racks with risk of arcing and inrush current. IC Role / Device Role / Timing Role: High-side switch supervisor enforcing soft-start via GATE slew control and detecting overcurrent during plug-in. Use Value: Prevents connector damage and bus collapse by limiting peak inrush to ≤5A and shutting off within 1µs of short detection. |
| Intrinsic Safety Barriers | Battery-Powered Medical Equipment |
Use Scenario: Isolated sensor interfaces in hazardous areas (Class I, Div 1) requiring fault containment under lightning-induced surges. IC Role / Device Role / Timing Role: Intrinsically safe power limiter using current-foldback (25mV at OUT <2V) and auto-cooldown to meet IEC 60079-11 energy limits. Use Value: Guarantees fault energy remains below ignition threshold even during repeated 80V surges, validated per entity parameter model. |
Use Scenario: Portable defibrillators and infusion pumps powered by Li-ion batteries subject to reverse connection and ESD events. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage protector enabling bidirectional SHDN tolerance (–60V to +100V) and 7µA shutdown mode. Use Value: Extends battery life by >200 hours/year versus discrete solutions and survives accidental –60V battery reversal without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363IMS-2#PBF | Same functionality and pinout; rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LT4363CMS-2#PBF. | Required for extended-temperature deployments in outdoor enclosures or engine compartments. | Select LT4363IMS-2#PBF when ambient operating temperature exceeds 70°C or requires wider qualification margin. |
| LT4363HMS-2#PBF | Identical architecture; qualified for –40°C to 125°C high-reliability operation with enhanced HTOL screening. | Specified for avionics, downhole tools, and military platforms where junction temperature may reach 125°C. | Choose LT4363HMS-2#PBF for DO-160, MIL-STD-810, or AEC-Q200-compliant designs requiring extended thermal margin. |
Compared with LT4363IMS-2#PBF and LT4363HMS-2#PBF, the LT4363CMS-2#PBF offers identical surge protection, auto-retry, and pinout in the commercial temperature grade - making it optimal for cost-sensitive industrial control panels and test equipment where ambient stays below 70°C.
Availability
LT4363CMS-2#PBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap modules, intrinsic safety barriers, and battery-powered medical equipment requiring stable component supply and long-term manufacturing continuity.
Supply support for LT4363CMS-2#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (now part of Analog Devices, Inc., following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT4363 family was designed specifically for high-reliability DC power protection in harsh environments - delivering integrated surge suppression, precise current limiting, and adaptive fault timing in compact packages for aerospace, industrial, and medical systems.
FAQ
What is the maximum input voltage the LT4363CMS-2#PBF can withstand without damage?
The LT4363CMS-2#PBF has an absolute maximum VCC rating of –60V to +100V. It operates continuously from 4V to 80V, but can survive transient surges beyond 100V - including 150V clamped overvoltage events - thanks to internal protection circuitry and robust pin ratings. Permanent damage occurs only if VCC exceeds 100V or drops below –60V.
How does the LT4363CMS-2#PBF differ from the LT4363CMS-1#PBF?
The LT4363CMS-2#PBF implements auto-restart after fault cool-down (TMR falling to 0.5V), whereas the LT4363CMS-1#PBF latches off permanently until manually reset via SHDN. Both share identical pinout, specs, and package, but LT4363CMS-2#PBF is preferred for unattended systems needing autonomous recovery from transient faults.
Can the LT4363CMS-2#PBF be used with P-channel MOSFETs?
No - the LT4363CMS-2#PBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver sources current relative to OUT (not GND), enabling efficient enhancement of N-MOSFETs. Driving a P-MOSFET would require inversion and level-shifting not supported by the IC's architecture or pin functions.
What is the purpose of the OV pin on the LT4363CMS-2#PBF?
The OV pin on the LT4363CMS-2#PBF is an overvoltage comparator input that inhibits automatic restart if its voltage exceeds 1.275V. This prevents oscillatory "motorboating" during sustained overvoltage conditions - ensuring the external MOSFET remains off until the input returns to a safe level, unlike the UV pin which only affects initial turn-on.
Does the LT4363CMS-2#PBF require an external sense resistor, and what value is typical?
Yes - the LT4363CMS-2#PBF requires an external current sense resistor between SNS and OUT. With a 50mV threshold, a 10mΩ resistor yields 5A current limit (50mV / 10mΩ = 5A); a 20mΩ resistor sets 2.5A. Resistor power rating must handle I²R dissipation during sustained faults, and layout must minimize parasitic inductance for sub-µs response.
LT4363CMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP
LT4363CMS-2#PBF FAQ
1.How can I place an order for LT4363CMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363CMS-2#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT4363CMS-2#PBF reliable?
The price and inventory of LT4363CMS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363CMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363CMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363CMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363CMS-2#PBF?
LT4363CMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363CMS-2#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT4363CMS-2#PBF?
For technical support, including LT4363CMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363CMS-2#PBF requirements.
6.How does Aetrix verify that LT4363CMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363CMS-2#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT4363CMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363CMS-2#PBF?
All LT4363CMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363CMS-2#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT4363CMS-2#PBF part is unused and in its original packaging.
Return procedure for LT4363CMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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