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Analog Devices Inc. LTC4366CDDB-2#TRPBF
- Part No.:
- LTC4366CDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366CDDB-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,077
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Product details
Overview
LTC4366CDDB-2#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 auto-retry fault recovery, adjustable 1.23V feedback threshold, 9-second internal cool-down timer, and operates across 9V to >500V input range. It is used in 28V vehicle systems requiring uninterrupted operation during transient surges up to 250V.
For engineers reviewing the LTC4366CDDB-2#TRPBF datasheet, LTC4366CDDB-2#TRPBF pinout, LTC4366CDDB-2#TRPBF application, or LTC4366CDDB-2#TRPBF equivalent, key selection criteria include its floating topology support, auto-retry behavior (vs latch-off), 0°C to 70°C temperature grade, DFN-8 (3mm × 2mm) package, and precise 1.23V regulation reference tolerance of ±3%.
Technical Context
The LTC4366CDDB-2#TRPBF implements a floating architecture where OUT powers internal circuitry-including the charge pump and overvoltage regulation amplifier-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, enabling precise clamping independent of absolute ground potential.
It uses dual shunt regulators (12V on VDD, 5.7V on OUT) and external resistors (RIN, RSS) to establish isolated supply rails. The TIMER pin controls overvoltage duration via external capacitor; for LTC4366CDDB-2#TRPBF, fault triggers after ~1µs (open) or configurable ms/µF timing, followed by automatic 9-second cool-down and restart.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Regulation Threshold | 1.23V below OUT (±3%), sets clamp voltage via RFB1/RFB2 ratio |
| Cool-Down Timer | 9 seconds (typical), enables auto-retry recovery without external intervention |
| Supply Range (VDD) | 4.5V to 12V, internally clamped; supports start-up from high-voltage rails via RIN |
| OUT Supply Clamp | 5.7V (shunt-regulated), powers floating regulation amplifier and charge pump |
| Shutdown Quiescent Current | <14µA (IVDD + IOUT), reduces system standby power in fault or idle states |
| Operating Temperature | 0°C to 70°C (Commercial grade), validated for industrial 28V DC distribution environments |
| GATE Drive Capability | 12V above OUT (clamped), delivers 200mA pull-down during fast overvoltage events |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9, optional VSS connection). Thermal resistance θJA = 75°C/W when VSS pad is soldered to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Supplies 7.5µA gate-charge current; clamped at 12V above VSS; no bypass capacitor required |
| SD | Shutdown control input | Active-low; threshold = VDD – 1.5V (280mV hysteresis); 700µs filter prevents false triggering |
| TIMER | Overvoltage duration control | Charged at 9µA; fault triggered at 2.8V; open = 1µs regulation; capacitor sets ms/µF timeout |
| VSS | Device return and substrate | Reference for all voltages; return path for OUT, TIMER, and BASE capacitors; exposed pad improves thermal performance |
| GATE | N-MOSFET gate driver output | Drives external FET gate; clamped 10–12V above OUT; 200mA pull-down activated during fast OV |
| OUT | Floating supply and regulation reference | Power rail for charge pump and OV amplifier; clamped at 5.7V; requires ≥0.22µF bypass to VSS |
| FB | Overvoltage regulation feedback | Senses voltage drop across RFB1; regulates to 1.23V below OUT; enables precise, ground-referenced clamp setting |
| BASE | External PNP base driver | Drives PNP emitter (grounded) to reduce RSS power dissipation; tied to VSS if unused |
Key Features
| Feature | Design Value |
|---|---|
| Floating topology support | Enables operation with input voltages >500V by powering regulation circuitry from OUT, isolating IC pins from surge |
| Auto-retry fault recovery | LTC4366CDDB-2#TRPBF automatically clears overvoltage fault after 9-second cool-down, restoring load power without manual reset |
| Adjustable overvoltage clamp | Set via external RFB1/RFB2 divider; regulation accuracy depends only on resistor tolerance and 1.23V reference stability |
| Low shutdown current | <14µA total quiescent draw allows integration into always-on systems without compromising battery life or standby efficiency |
| Robust gate drive protection | Integrated 200mA pull-down and 12V clamp prevent MOSFET gate overdrive and ensure reliable turn-off during fast transients |
Applications
| 28V Vehicle Power Distribution | Avionic High-Voltage DC Bus Protection |
|---|---|
Use Scenario: Protecting avionics subsystems from load dump and alternator overshoot in MIL-STD-704F-compliant 28V aircraft power systems. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V during 250V transients while maintaining uninterrupted load operation. Use Value: Eliminates need for bulky TVS diodes; enables use of cost-effective N-channel MOSFETs instead of expensive high-voltage P-ch devices. |
Use Scenario: Safeguarding flight-critical sensors and controllers connected to unregulated 270V DC aircraft bus during lightning-induced surges. IC Role / Device Role / Timing Role: Floating overvoltage protector controlling external MOSFET to clamp transients >500V while sustaining regulated 28V output. Use Value: Achieves >100kV/µs surge immunity via external MOSFET SOA management and 9-second thermal recovery window. |
| Industrial High-Voltage DC Distribution | Rugged Floating Topology Systems |
Use Scenario: Securing programmable logic controllers and motor drives powered from 300–400V DC microgrids against grid switching transients. IC Role / Device Role / Timing Role: Adjustable clamp controller setting 350V output limit with 1.23V precision reference and external resistor network. Use Value: Supports wide input range (9V–>500V) with single BOM item; eliminates redesign when system voltage scales upward. |
Use Scenario: Enabling isolated power delivery in high-side switch configurations where ground-referenced ICs cannot operate. IC Role / Device Role / Timing Role: Self-powered regulator using OUT as local supply, decoupling control circuitry from input ground potential. Use Value: Removes need for isolated DC/DC bias supplies; simplifies layout and reduces component count in floating gate-drive applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366CDDB-1#TRPBF | Latches off after overvoltage fault; requires SD pin toggle to reset | Suitable for safety-critical systems requiring manual fault acknowledgment before restart | Select LTC4366CDDB-1#TRPBF only if auto-retry is prohibited by system safety policy |
| TPS26631RGER | Fixed 36V overvoltage clamp; no adjustable feedback; integrated MOSFET; no floating architecture | Designed for lower-voltage (≤60V) industrial I/O modules with space-constrained layouts | Choose TPS26631RGER only for ≤60V fixed-clamp applications where board area and BOM count outweigh flexibility needs |
Compared with LTC4366CDDB-1#TRPBF and TPS26631RGER, the LTC4366CDDB-2#TRPBF uniquely combines field-adjustable clamping, auto-retry recovery, and true floating operation-making it the only option capable of protecting loads from >500V transients while maintaining continuous power delivery in mobile and aerospace platforms.
Availability
LTC4366CDDB-2#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, and industrial high-voltage distribution requiring stable component supply, long-term lifecycle assurance, and commercial-grade temperature performance.
Supply support for LTC4366CDDB-2#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 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 rugged floating topologies in automotive, avionics, and industrial power systems where traditional ground-referenced protectors fail.
FAQ
What is the key functional difference between LTC4366CDDB-2#TRPBF and LTC4366CDDB-1#TRPBF?
The LTC4366CDDB-2#TRPBF implements auto-retry behavior: after an overvoltage fault, it enters a 9-second cool-down period and then automatically restarts. In contrast, the LTC4366CDDB-1#TRPBF latches off permanently until the SD pin is actively toggled low-then-high to clear the fault. This makes LTC4366CDDB-2#TRPBF ideal for unattended or remote systems where manual reset is impractical.
How does LTC4366CDDB-2#TRPBF achieve operation with input voltages exceeding 500V?
The LTC4366CDDB-2#TRPBF uses a floating architecture: its internal regulation amplifier and charge pump are powered from the OUT pin-not VDD or ground-allowing the IC to rise with the input supply. External resistors (RIN, RSS) and dual shunt regulators (12V on VDD, 5.7V on OUT) isolate internal circuitry, so only the external N-channel MOSFET and resistors must withstand the full surge voltage.
What is the exact overvoltage regulation reference voltage for LTC4366CDDB-2#TRPBF, and how is it used?
The LTC4366CDDB-2#TRPBF regulates the FB pin to 1.23V below the OUT pin voltage, with ±3% tolerance over temperature. This reference is applied across RFB1 in the external feedback divider; the resulting output clamp voltage equals OUT = FB + 1.23V × (1 + RFB2/RFB1), enabling precise, resistor-defined overvoltage thresholds independent of ground potential.
Can LTC4366CDDB-2#TRPBF be used without an external MOSFET?
No. The LTC4366CDDB-2#TRPBF is a controller IC only-it requires an external N-channel MOSFET to perform overvoltage clamping. The GATE pin drives the MOSFET gate, and the device relies entirely on the MOSFET's voltage rating and SOA to handle surge energy. No internal power switch is present; attempting operation without the MOSFET will result in no output regulation or protection.
What thermal considerations apply to the DFN package of LTC4366CDDB-2#TRPBF?
The LTC4366CDDB-2#TRPBF in the 3mm × 2mm DFN package achieves θJA = 75°C/W when the exposed pad (pin 9) is soldered to a PCB ground plane. If the pad is left unconnected, θJA degrades to 135°C/W. For reliable operation under sustained overvoltage conditions, thermal design must account for power dissipated in the external MOSFET-not the IC itself-as the LTC4366CDDB-2#TRPBF draws <20µA in shutdown and minimal quiescent current during regulation.
LTC4366CDDB-2#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)
LTC4366CDDB-2#TRPBF FAQ
1.How can I place an order for LTC4366CDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366CDDB-2#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 LTC4366CDDB-2#TRPBF reliable?
The price and inventory of LTC4366CDDB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366CDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366CDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366CDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366CDDB-2#TRPBF?
LTC4366CDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366CDDB-2#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 LTC4366CDDB-2#TRPBF?
For technical support, including LTC4366CDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366CDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC4366CDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366CDDB-2#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 LTC4366CDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366CDDB-2#TRPBF?
All LTC4366CDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366CDDB-2#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 LTC4366CDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366CDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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