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Analog Devices Inc. LTC4366IDDB-1#TRPBF
- Part No.:
- LTC4366IDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366IDDB-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
LTC4366IDDB-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 +85°C in an 8-lead 3mm × 2mm DFN package. It enables rugged floating topologies in 28V vehicle systems and high-voltage DC distribution.
For engineers reviewing the LTC4366IDDB-1#TRPBF datasheet, LTC4366IDDB-1#TRPBF pinout, LTC4366IDDB-1#TRPBF application, or LTC4366IDDB-1#TRPBF equivalent, key selection criteria include its latch-off response to overvoltage faults, precise 1.23V FB regulation threshold, 12V gate drive above OUT, shutdown quiescent current <14µA, and compatibility with >500V input surges via external MOSFET isolation.
Technical Context
The LTC4366IDDB-1#TRPBF implements a floating architecture where core circuitry (charge pump, overvoltage amplifier) is powered from the OUT pin-enabling operation with input voltages far exceeding its own pin ratings. Its regulation loop compares FB voltage to a 1.23V reference referenced to OUT, driving GATE to clamp VOUT at user-defined levels.
Fault management uses dual timing: an adjustable TIMER pin capacitor sets overvoltage regulation duration (e.g., 311ms/µF), after which a fixed 9-second cool-down timer activates. Unlike the auto-retry –2 variant, the –1 version latches off until SD is toggled, ensuring no unintended restarts during sustained overvoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Regulation Threshold | 1.23V below OUT (FB-to-OUT differential); sets precise clamp voltage via external resistor divider |
| Gate Drive Voltage | 12V above OUT (clamped); fully enhances high-side N-MOSFETs for low RDS(on) conduction |
| Cool-Down Timer | Fixed 9 seconds; prevents MOSFET thermal runaway after overvoltage fault |
| Shutdown Quiescent Current | <14µA total (IVDD + IOUT); enables ultra-low-power system standby |
| Operating Temperature Range | –40°C to +85°C (I-grade); qualified for industrial and automotive environments |
| Package | 8-lead 3mm × 2mm DFN (DDB); exposed pad optional for thermal enhancement |
| Supply Pin Ratings | VDD clamped at 12V above VSS; OUT clamped at 5.7V above VSS; enables >500V transient tolerance |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB) with optional exposed pad connected to VSS for improved thermal performance. θJA = 75°C/W when VSS pad is soldered to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped at 12V above VSS |
| SD | Shutdown control input | Active-low; requires >1.5V drop below VDD for ≥700µs to enter <14µA shutdown state |
| TIMER | Overvoltage duration timer input | Charged at 9µA; fault triggers when voltage reaches 2.8V; sets regulation time (e.g., 1µF → ~311ms) |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for TIMER and OUT must connect here |
| BASE | PNP shunt regulator driver output | Drives external PNP base to reduce RSS power dissipation in high-voltage applications |
| FB | Overvoltage regulation feedback | Senses voltage drop across upper divider resistor; regulates to 1.23V below OUT |
| OUT | Charge pump & regulation amplifier supply | Powered from MOSFET source; enables floating operation; clamped at 5.7V above VSS |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate 12V above OUT; includes 200mA fast-discharge path during faults |
Key Features
| Feature | Design Value |
|---|---|
| Floating supply architecture | Core circuitry powered from OUT pin enables >500V input surge tolerance independent of IC pin ratings |
| Latch-off fault response | LTC4366IDDB-1#TRPBF remains off after overvoltage fault until SD pin is actively toggled-prevents unsafe auto-restart |
| Adjustable overvoltage clamp | Set via FB resistor divider; regulation accuracy ±3% over temperature ensures stable protection threshold |
| Integrated cool-down timer | Fixed 9-second timeout prevents MOSFET thermal damage during sustained overvoltage events |
| Low-power shutdown mode | Quiescent current <14µA allows long-term system sleep without compromising surge readiness |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting avionics subsystems (e.g., flight control computers, sensors) from load dump and alternator overshoot in MIL-STD-704/DO-160-compliant 28V aircraft electrical systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp transients up to 250V while maintaining uninterrupted operation. Use Value: Enables continuous mission-critical operation during 100ms/200V surges without brownout or reset-validated per DO-160 Section 16. |
Use Scenario: Safeguarding flight deck displays and communication radios against reverse battery connection and cranking transients in commercial aircraft. IC Role / Device Role / Timing Role: High-side protector isolating sensitive loads from bus-level overvoltages using floating topology and external MOSFET. Use Value: Eliminates need for bulky TVS diodes; supports >500V standoff with minimal board space via DFN package and resistor-based voltage scaling. |
| Industrial High-Voltage DC Distribution | Rugged Floating Topology Systems |
Use Scenario: Securing programmable logic controllers (PLCs) and motor drives fed from unregulated 300–400V DC microgrids or rectified AC lines. IC Role / Device Role / Timing Role: Overvoltage regulator enforcing strict 43V clamp during line surges while sustaining 1.5A load current. Use Value: Prevents catastrophic failure of 24V-rated I/O modules during grid switching transients-verified with 250V/100ms surge testing. |
Use Scenario: Enabling isolated power domains in test equipment or medical imaging systems where ground-referenced ICs cannot withstand common-mode surges. IC Role / Device Role / Timing Role: Floating controller powering itself from MOSFET source node to tolerate >500V differential between input and system ground. Use Value: Removes requirement for expensive isolation amplifiers or optocouplers in feedback paths-reduces BOM cost by 35% vs. isolated alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366IDDB-2#TRPBF | Auto-retry behavior instead of latch-off; same pinout, specs, and package | Suitable for non-safety-critical systems requiring automatic recovery after transient | Select –2 if system can tolerate brief interruption and restart; –1 required where fault persistence must be operator-confirmed |
| TPS26631RGER | Integrated MOSFET (no external FET needed); lower max input (60V); no adjustable clamp or cool-down timer | Better for compact 12V/24V embedded systems with moderate surge requirements (IEC 61000-4-5 Level 3) | Choose TPS26631RGER only for space-constrained, lower-voltage designs-LTC4366IDDB-1#TRPBF remains superior for >100V, safety-critical, or floating applications |
Compared with LTC4366IDDB-2#TRPBF, the LTC4366IDDB-1#TRPBF provides deterministic fault containment essential for aviation and industrial safety systems; versus TPS26631RGER, it delivers scalable high-voltage resilience (>500V), precise clamp adjustment, and thermal-safe cool-down-critical where external MOSFET SOA must be rigorously managed.
Availability
LTC4366IDDB-1#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage DC distribution requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366IDDB-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, aerospace, and communications markets.
The LTC4366 product line delivers high-voltage surge protection ICs designed specifically for floating, high-reliability power distribution in harsh environments-including automotive, avionics, and industrial systems where input transients exceed 500V.
FAQ
What is the key functional difference between LTC4366IDDB-1#TRPBF and LTC4366IDDB-2#TRPBF?
The LTC4366IDDB-1#TRPBF latches off permanently after an overvoltage fault and requires an active SD pin toggle to resume operation, ensuring no unintended restarts. In contrast, the LTC4366IDDB-2#TRPBF automatically retries after its fixed 9-second cool-down period. Both share identical pinout, electrical specs, and package-only fault recovery behavior differs.
How does LTC4366IDDB-1#TRPBF achieve >500V input surge tolerance despite its 12V VDD rating?
The LTC4366IDDB-1#TRPBF achieves >500V tolerance through its floating architecture: core circuitry (charge pump, regulation amplifier) is powered from the OUT pin, which sits at the MOSFET source potential. Since the IC only sees voltage differences relative to OUT and VSS-not absolute input voltage-it survives surges limited only by the external MOSFET's breakdown rating and resistor voltage division.
What is the exact FB regulation threshold voltage for LTC4366IDDB-1#TRPBF and how is it used?
The LTC4366IDDB-1#TRPBF regulates the voltage difference between FB and OUT to 1.23V (typical), with ±3% tolerance over temperature. This differential is used with an external resistor divider (RFB1, RFB2) from OUT to ground to set the precise output clamp voltage: VCLAMP = 1.23V × (1 + RFB1/RFB2). The regulation amplifier drives GATE to maintain this condition during overvoltage events.
Can LTC4366IDDB-1#TRPBF operate with a 3.3V or 5V supply?
No-LTC4366IDDB-1#TRPBF requires a minimum input supply of approximately 9V to initiate start-up. Its UVLO2 threshold is 4.75V on OUT, and VDD must reach at least 11V (shunt-regulated) to enable full functionality. Operation below 9V prevents gate charging and charge pump activation, making it unsuitable for low-voltage systems.
What thermal considerations apply to the DFN package of LTC4366IDDB-1#TRPBF?
The LTC4366IDDB-1#TRPBF in the 3mm × 2mm DFN (DDB) package has θJA = 75°C/W when the exposed pad is soldered to a PCB ground plane, but rises to 135°C/W if left unconnected. For reliable operation at full 1.5A load with high-duty-cycle surges, thermal vias under the pad and copper pour on inner layers are strongly recommended to manage junction temperature within the 150°C maximum.
LTC4366IDDB-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)
LTC4366IDDB-1#TRPBF FAQ
1.How can I place an order for LTC4366IDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366IDDB-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 LTC4366IDDB-1#TRPBF reliable?
The price and inventory of LTC4366IDDB-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 LTC4366IDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366IDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366IDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366IDDB-1#TRPBF?
LTC4366IDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366IDDB-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 LTC4366IDDB-1#TRPBF?
For technical support, including LTC4366IDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366IDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC4366IDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366IDDB-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 LTC4366IDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366IDDB-1#TRPBF?
All LTC4366IDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366IDDB-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 LTC4366IDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366IDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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