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Analog Devices Inc. LTC4366IDDB-1#TRMPBF
- Part No.:
- LTC4366IDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366IDDB-1#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
LTC4366IDDB-1#TRMPBF 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 >500V, maintains load operation under 43V clamping, features adjustable overvoltage timer and internal 9-second cool-down timer, and operates across –40°C to +85°C in rugged industrial and vehicle systems.
For engineers reviewing the LTC4366IDDB-1#TRMPBF datasheet, LTC4366IDDB-1#TRMPBF pinout, LTC4366IDDB-1#TRMPBF application, or LTC4366IDDB-1#TRMPBF equivalent, this page delivers verified functional identity, confirmed DFN-8 (3mm × 2mm) package mapping, validated 8-pin terminal roles, exact overvoltage regulation threshold (1.23V below OUT), and real-world timing behavior for surge protection design.
Technical Context
The LTC4366IDDB-1#TRMPBF implements a floating topology where VDD, OUT, and BASE pins are independently shunt-regulated (11.7V, 5.5V, and 6.1V respectively), enabling operation with input voltages exceeding 500V by isolating internal circuitry behind the external MOSFET. Its overvoltage regulation amplifier compares FB to a precise 1.23V reference referenced to OUT, delivering fast 150ns response to transient events.
It uses dual-stage gate control: a 7.5µA VDD-sourced current initiates MOSFET turn-on, then a 2MHz charge pump drives GATE to 12V above OUT once UVLO2 (4.75V) is crossed. During overvoltage, a 200mA pull-down on GATE activates before regulation, and TIMER pin charging at 9µA triggers fault latching after programmable delay - the LTC4366-1 variant latches off permanently until SD reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Clamp Voltage | Configurable via FB divider; regulates output at precise 1.23V below OUT, enabling 43V clamp in typical 28V system |
| Operating Temperature Range | –40°C to +85°C (I-grade), validated for automotive and industrial environments with no derating |
| Package | 8-lead DFN (3mm × 2mm), exposed pad optional to VSS, θJA = 75°C/W when VSS soldered |
| GATE Drive Capability | Drives external N-MOSFET gate to 12V above OUT; supports fast discharge (300mA sink) and fault current limiting (1.25mA) |
| Shutdown Quiescent Current | <14µA total IVDD + IOUT, enabling ultra-low-power standby in battery-backed or energy-sensitive systems |
| Overvoltage Timer | Adjustable via capacitor on TIMER pin (311ms/µF); latches off on timeout - LTC4366-1 does not auto-retry |
| Cool-Down Timer | Fixed 9-second internal timer after fault, ensuring MOSFET thermal recovery before any restart attempt |
Pinout & Package
8-lead (3mm × 2mm) plastic DFN package with optional exposed pad connected to VSS. Pin 1 marked via dot; top view matches DDB pinout: VDD (1), SD (2), TIMER (3), VSS (4), BASE (5), FB (6), OUT (7), GATE (8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | 12V-shunt-regulated pin powering initial gate charge (7.5µA source) and logic; not bypassed |
| SD | Shutdown enable input | Active-low comparator with 1.5V threshold below VDD and 280mV hysteresis; 700µs filter prevents false triggers |
| TIMER | Overvoltage duration control | Charged at 9µA; fault latches when voltage reaches 2.8V; sets regulation window before shutdown |
| VSS | Device return and substrate | Reference for all regulators and timers; bypass capacitors for OUT and TIMER must connect here |
| BASE | PNP base driver output | 6.1V Zener-referenced output enabling external PNP shunt for reduced RSS power dissipation |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds OUT–FB = 1.23V ±30mV over temperature |
| OUT | Floating supply rail | 5.5V-shunt-regulated supply for charge pump and regulation amplifier; requires ≥0.22µF bypass to VSS |
| GATE | External MOSFET gate driver | Drives N-MOSFET gate with 12V above OUT; includes 200mA fast pull-down and 300mA discharge capability |
Key Features
| Feature | Design Value |
|---|---|
| Floating high-voltage operation | Enables >500V input protection by powering regulation circuitry from OUT, isolating internal pins from surge |
| Adjustable overvoltage clamp | Set via resistor divider on FB pin; achieves stable 43V output regulation in 28V vehicle systems without trimming |
| Latched-off fault response | LTC4366-1 variant holds GATE low after overvoltage timeout until SD pin is toggled - prevents uncontrolled retries |
| Thermal-safe cool-down timer | Guarantees 9-second MOSFET off-time post-fault, preventing cumulative thermal stress during repeated surges |
| Ultra-low shutdown IQ | Reduces total supply current to <14µA, supporting long-term storage or battery-backed keep-alive modes |
Applications
| 28V Vehicle Power Distribution | Industrial DC Bus Protection |
|---|---|
Use Scenario: Protecting avionics and engine control units from load dump transients (up to 250V) in 28V aircraft and military vehicles. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V while dropping excess voltage across external MOSFET; latched-off response prevents re-engagement during sustained overvoltage. Use Value: Maintains uninterrupted operation of critical loads during ISO 7637-2 Pulse 5a events without requiring oversized TVS diodes or sacrificial fuses. |
Use Scenario: Securing PLC I/O modules and motor drives against lightning-induced surges on 48V–300V industrial DC distribution rails. IC Role / Device Role / Timing Role: Controls high-current N-MOSFET to clamp transients; TIMER pin configures 100ms regulation window before latching off. Use Value: Eliminates need for parallel MOV stacks by shifting surge energy dissipation to robust external MOSFET with SOA-validated layout. |
| High-Voltage Test Equipment | Rugged Floating Power Supplies |
Use Scenario: Safeguarding calibration circuitry in portable HV test gear exposed to accidental 600V+ connections during field use. IC Role / Device Role / Timing Role: Acts as primary overvoltage guard; BASE pin enables PNP-assisted RSS reduction for compact 3kV-rated resistor selection. Use Value: Achieves Class I insulation compliance with minimal BOM count - no optocouplers or isolated supplies needed for control logic. |
Use Scenario: Enabling floating bias supplies in isolated gate drivers for SiC/GaN inverters operating at 800V bus voltages. IC Role / Device Role / Timing Role: Powers its own regulation circuitry from OUT rail; VDD and BASE shunt regulators sustain operation even when input floats 500V above ground. Use Value: Replaces discrete Zener+transistor solutions with guaranteed 150°C junction rating and production-tested thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366IDDB-2#TRMPBF | Auto-retry version with identical pinout, specs, and package; replaces latched-off behavior with 9-second cool-down + automatic restart | Suitable where transient overvoltages are brief and predictable (e.g., lab equipment), not sustained faults | Select only if system-level fault recovery policy permits autonomous re-engagement without host intervention |
| TPS26631RGER | Integrated 60V eFuse with current limiting and overvoltage clamp; no external MOSFET required but max input 60V vs. >500V for LTC4366 | Used in lower-voltage DC systems (<60V) where space-constrained designs preclude external FET layout | Choose for compact 12V/24V embedded systems needing combined OVP/OCP; not viable for >60V or high-energy surge scenarios |
Compared with LTC4366IDDB-2#TRMPBF, the LTC4366IDDB-1#TRMPBF provides deterministic fault containment ideal for safety-critical systems, while TPS26631RGER trades voltage range and external FET flexibility for integration - making LTC4366IDDB-1#TRMPBF the sole option for >100V transient suppression with thermal-aware latching.
Availability
LTC4366IDDB-1#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, industrial DC distribution, high-voltage test equipment, and rugged floating power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366IDDB-1#TRMPBF 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.
The LTC4366 product line delivers high-voltage surge protection ICs designed specifically for floating, ultra-wide-input industrial and automotive power systems - prioritizing thermal safety, latch-controlled fault response, and MOSFET-based energy handling over integrated FET convenience.
FAQ
What is the key functional difference between LTC4366IDDB-1#TRMPBF and LTC4366IDDB-2#TRMPBF?
The LTC4366IDDB-1#TRMPBF latches off permanently after an overvoltage fault and requires an SD pin toggle to resume operation, whereas the LTC4366IDDB-2#TRMPBF automatically enters a 9-second cool-down period and then retries. This makes LTC4366IDDB-1#TRMPBF appropriate for safety-critical systems where uncontrolled restart could compromise integrity. Both share identical pinout, package, and electrical specifications.
How does the LTC4366IDDB-1#TRMPBF achieve >500V input capability despite its 12V-rated pins?
The LTC4366IDDB-1#TRMPBF achieves >500V operation through a floating architecture: its internal circuitry is powered from the OUT pin (regulated to 5.5V), not directly from VIN. The external N-MOSFET isolates high-voltage transients, allowing only the MOSFET's breakdown rating - not the IC's pin limits - to define maximum input. VDD and BASE shunt regulators further decouple internal rails from surge paths.
What is the minimum recommended value for the TIMER capacitor in LTC4366IDDB-1#TRMPBF applications?
The minimum recommended TIMER capacitor for LTC4366IDDB-1#TRMPBF is 100pF, setting a ~31µs regulation window before fault latching. However, typical designs use ≥1nF (311ms) to allow sufficient time for transient absorption without premature shutdown. Values below 100pF risk erratic latching due to noise sensitivity on the TIMER pin, which charges at 9µA and trips at 2.8V.
Can the LTC4366IDDB-1#TRMPBF drive a logic-level MOSFET directly, or is a level-shifter required?
The LTC4366IDDB-1#TRMPBF drives the external MOSFET gate relative to its source (OUT), not ground - delivering up to 12V above OUT. No level-shifter is needed; however, the MOSFET must be N-channel with VGS(th) ≤ 3V and rated for 12V gate drive. Standard logic-level parts like Si2302DS or DMN2004K are compatible, but gate resistor RG (typically 10Ω) remains essential for EMI control and dV/dt limiting.
Does the LTC4366IDDB-1#TRMPBF provide overcurrent protection, or is external sensing required?
The LTC4366IDDB-1#TRMPBF does not include overcurrent protection - it is solely an overvoltage protector. Load current limiting must be implemented externally, either via current-sense resistor + comparator driving SD, or by pairing with a dedicated eFuse like TPS25982. Its regulation loop responds only to OUT–FB voltage deviation, not to output current magnitude.
LTC4366IDDB-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC4366IDDB-1#TRMPBF FAQ
1.How can I place an order for LTC4366IDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366IDDB-1#TRMPBF 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 LTC4366IDDB-1#TRMPBF reliable?
The price and inventory of LTC4366IDDB-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366IDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366IDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366IDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366IDDB-1#TRMPBF?
LTC4366IDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366IDDB-1#TRMPBF 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 LTC4366IDDB-1#TRMPBF?
For technical support, including LTC4366IDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366IDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC4366IDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366IDDB-1#TRMPBF 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 LTC4366IDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366IDDB-1#TRMPBF?
All LTC4366IDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366IDDB-1#TRMPBF, 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 LTC4366IDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366IDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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