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Analog Devices Inc. LTC4366HDDB-1#TRPBF
- Part No.:
- LTC4366HDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366HDDB-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
LTC4366HDDB-1#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients using an external N-channel MOSFET. It features adjustable overvoltage clamping (via FB divider), 9-second internal cool-down timer, latch-off fault behavior (–1 version), and operates across –40°C to 125°C. Used in 28V vehicle systems and high-voltage DC distribution where uninterrupted operation under transient surges up to >500V is required.
For engineers reviewing the LTC4366HDDB-1#TRPBF datasheet, LTC4366HDDB-1#TRPBF pinout, LTC4366HDDB-1#TRPBF application, or LTC4366HDDB-1#TRPBF equivalent, key selection considerations include its –40°C to 125°C H-grade rating, DFN-8 (3mm × 2mm) package with exposed pad, 1.23V FB regulation threshold, 12V GATE drive above OUT, and latch-off response to overvoltage faults.
Technical Context
The LTC4366HDDB-1#TRPBF implements a floating topology where internal circuitry is powered from the MOSFET source (OUT pin), enabling operation with input voltages exceeding 500V - limited only by external MOSFET and resistor ratings. Its overvoltage regulation amplifier compares FB voltage to a 1.23V reference below OUT and drives GATE to clamp output at user-defined voltage.
Fault management includes a TIMER pin-controlled overvoltage duration limit (adjustable via capacitor), followed by a fixed 9-second cool-down period. Unlike the auto-retry –2 version, the –1 variant latches off after fault and requires SD pin toggling to reset - critical for safety-critical automotive and avionic applications requiring explicit fault acknowledgment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C (H-grade); enables use in under-hood automotive and industrial environments without derating. |
| FB Regulation Threshold | 1.23V below OUT (±3%); sets precise overvoltage clamp point via RFB1/RFB2 divider ratio. |
| GATE Drive Voltage | 12V above OUT (min 11.2V); ensures full enhancement of high-threshold N-channel MOSFETs. |
| Cool-Down Timer | 9 seconds (typical); prevents MOSFET thermal runaway by enforcing minimum off-time after overvoltage fault. |
| Shutdown Quiescent Current | <14µA (IVDD + IOUT); allows low-power system-level sleep modes without compromising surge readiness. |
| Package | 8-lead 3mm × 2mm DFN with exposed pad; supports high thermal dissipation (θJA = 75°C/W when VSS soldered). |
| Fault Response | Latch-off (–1 version); requires active SD pin reset - eliminates unintended re-engagement during persistent overvoltage. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), rated for –40°C to 125°C operation. Exposed pad may be left open or connected to VSS for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped to 12V above VSS - isolates logic from input surge. |
| SD | Shutdown control input | Active-low enable; requires >1.5V drop below VDD for ≥700µs to enter shutdown (<14µA IQ); clears latch on –1 version. |
| TIMER | Overvoltage duration timing input | Charged at 9µA; fault triggered when voltage reaches 2.8V - sets max regulation time (CT = 3.2nF/ms). |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for OUT and TIMER must connect here; thermal path via exposed pad. |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate 12V above OUT; includes 200mA fast-discharge path during overvoltage events. |
| OUT | Floating supply and regulation reference | Power rail for charge pump and regulation amplifier; clamped at 5.7V; UVLO2 = 4.75V enables charge pump activation. |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds FB = OUT – 1.23V to set clamp voltage. |
| BASE | External PNP shunt regulator driver | Drives base of external PNP to reduce RSS power dissipation in high-voltage floating configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Floating architecture | Enables >500V input operation by powering regulation circuitry from MOSFET source (OUT), not input rail. |
| Adjustable overvoltage clamp | User-configurable via FB resistive divider - no fixed voltage; supports 43V, 100V, or custom clamp points. |
| Latch-off fault response | Guarantees MOSFET remains off after overvoltage until explicit SD pin reset - meets ASIL-B functional safety intent. |
| Thermal-safe cool-down timer | Fixed 9-second internal timeout prevents repeated MOSFET stress during sustained overvoltage conditions. |
| Low shutdown current | <14µA total IQ in shutdown - preserves battery life in always-on vehicle systems without sacrificing protection readiness. |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting flight control electronics from load dump and alternator overshoot in MIL-STD-704/DO-160 compliant aircraft systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp bus voltage at 34V during 100V/100ms transients. Use Value: Maintains uninterrupted power to critical avionics while dissipating surge energy in external MOSFET - avoids system reset or brownout. |
Use Scenario: Securing navigation and communication modules against ISO 7637-2 Pulse 5a (load dump) in military ground vehicles. IC Role / Device Role / Timing Role: Overvoltage protector regulating output at 43V during 250V surges, with 9s cool-down to prevent MOSFET thermal failure. Use Value: Eliminates need for bulky TVS diodes; achieves precise clamp voltage with minimal board space and no derating at 125°C ambient. |
| Industrial High-Voltage DC Links | Rugged Floating Power Supplies |
Use Scenario: Safeguarding PLC I/O modules fed from 300V DC distribution rails in factory automation systems. IC Role / Device Role / Timing Role: High-side controller using external MOSFET to isolate 24V loads from >500V DC link surges. Use Value: Enables single-point surge protection for entire subsystem - replaces multiple discrete protectors with calibrated, repeatable response. |
Use Scenario: Building isolated auxiliary supplies for sensors in high-potential test equipment where input floats up to 600V. IC Role / Device Role / Timing Role: Floating regulator IC powered from MOSFET source, referenced to load ground - no ground loop constraints. Use Value: Removes need for isolated DC-DC converters; supports direct sensing of load-side voltage with no level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366HDDB-2#TRPBF | Auto-retry fault response (9s cool-down then self-restart); identical pinout, specs, and package. | Suitable for non-safety-critical systems where automatic recovery after transient is acceptable. | Select –2 if continuous availability outweighs need for explicit fault acknowledgment. |
| TPS26631RHFR | Integrated 60V MOSFET; fixed 36V OVP threshold; no adjustable clamp or external MOSFET control. | Targeted at lower-voltage industrial ports (<60V); lacks floating architecture and >500V capability. | Choose TPS26631 only for compact, cost-sensitive 24V/48V designs where external MOSFET flexibility is unnecessary. |
Compared with LTC4366HDDB-2#TRPBF, the LTC4366HDDB-1#TRPBF provides deterministic fault holdoff essential for safety validation, while TPS26631RHFR trades adjustability and voltage range for integration - making LTC4366HDDB-1#TRPBF the sole option for >300V floating overvoltage protection with latch-off behavior.
Availability
LTC4366HDDB-1#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage DC links requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366HDDB-1#TRPBF 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., a wholly owned subsidiary of Analog Devices, Inc.) designs precision analog, mixed-signal, and digital signal processing ICs for high-reliability applications.
The LTC4366 product line delivers high-voltage surge protection ICs with floating architectures, targeting automotive, avionic, and industrial systems where input transients exceed 300V and functional safety mandates explicit fault control.
FAQ
What is the operating temperature range for the LTC4366HDDB-1#TRPBF?
The LTC4366HDDB-1#TRPBF is rated for –40°C to 125°C ambient operation (H-grade), validated per manufacturer specifications. This range supports under-hood automotive deployment and industrial environments with minimal thermal derating. The DFN package's exposed pad enhances thermal transfer when soldered to PCB ground planes, maintaining junction temperature within safe limits even at full load.
How does the LTC4366HDDB-1#TRPBF differ from the LTC4366HDDB-2#TRPBF?
The LTC4366HDDB-1#TRPBF features latch-off fault behavior: once an overvoltage event triggers shutdown, it remains off until the SD pin is actively toggled. In contrast, the LTC4366HDDB-2#TRPBF auto-retries after a fixed 9-second cool-down. Both share identical pinout, electrical specs, package, and temperature rating - the only functional difference is fault recovery strategy.
Can the LTC4366HDDB-1#TRPBF regulate output voltage at 100V?
Yes - the LTC4366HDDB-1#TRPBF regulates output via the FB pin, which is held at 1.23V below OUT. By selecting appropriate RFB1/RFB2 resistor values (e.g., RFB1 = 12.4kΩ, RFB2 = 422kΩ for ~43V), users can configure clamping at 100V or any higher value. The floating architecture ensures internal circuitry remains isolated from the 100V rail, relying only on external MOSFET and resistor voltage ratings.
What is the purpose of the BASE pin on the LTC4366HDDB-1#TRPBF?
The BASE pin on the LTC4366HDDB-1#TRPBF drives the base of an external PNP transistor to reduce power dissipation in the RSS resistor. In high-input-voltage applications (>200V), RSS would otherwise require large physical size and wattage. Using a PNP shunt lowers RSS current demand by leveraging transistor beta gain - enabling smaller, more reliable resistor selection without compromising surge handling.
Does the LTC4366HDDB-1#TRPBF require a minimum input voltage to start up?
Yes - startup requires sufficient voltage to charge C1 to the UVLO2 threshold of 4.75V. Minimum input depends on RIN, RSS, MOSFET threshold, Schottky drop, and bias currents. Per design equations in the datasheet, VIN(MIN) ≈ (9µA × RIN) + 0.58V + VTH + 4.75V + (45µA × RSS). For typical 324kΩ RIN and 46.4kΩ RSS, minimum startup voltage is ~18V - verified in Figure 1's 28V system.
LTC4366HDDB-1#TRPBF 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)
LTC4366HDDB-1#TRPBF FAQ
1.How can I place an order for LTC4366HDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HDDB-1#TRPBF 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 LTC4366HDDB-1#TRPBF reliable?
The price and inventory of LTC4366HDDB-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366HDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HDDB-1#TRPBF?
LTC4366HDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HDDB-1#TRPBF 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 LTC4366HDDB-1#TRPBF?
For technical support, including LTC4366HDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC4366HDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HDDB-1#TRPBF 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 LTC4366HDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HDDB-1#TRPBF?
All LTC4366HDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HDDB-1#TRPBF, 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 LTC4366HDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366HDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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