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Analog Devices Inc. LTC4366HDDB-2#TRPBF
- Part No.:
- LTC4366HDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366HDDB-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,462
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Product details
Overview
LTC4366HDDB-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 FB reference, 9-second internal cool-down timer, and operates across –40°C to 125°C in a 3mm × 2mm DFN package. It is used in 28V vehicle systems requiring uninterrupted operation under 250V input surges.
For engineers reviewing the LTC4366HDDB-2#TRPBF datasheet, LTC4366HDDB-2#TRPBF pinout, LTC4366HDDB-2#TRPBF application, or LTC4366HDDB-2#TRPBF equivalent, key selection criteria include its auto-retry behavior (vs. latch-off), floating topology support up to >500V input, adjustable overvoltage clamp via FB divider, GATE drive capability up to 12V above OUT, and thermal robustness in harsh automotive/industrial environments.
Technical Context
The LTC4366HDDB-2#TRPBF implements a floating architecture where regulation circuitry is powered from the MOSFET source (OUT pin), enabling operation with input voltages far exceeding its own absolute maximum ratings. Its overvoltage regulation amplifier compares FB to a 1.23V reference below OUT and drives GATE to maintain clamping.
It integrates dual shunt regulators (12V on VDD, 5.7V on OUT), a 9µA TIMER pin current source, and a charge pump that delivers 20µA to fully bias GATE at +12V relative to OUT. The LTC4366-2 variant automatically clears faults after a fixed 9-second cool-down period without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Regulation Threshold | 1.23V below OUT pin - sets precise clamp voltage via external FB resistor divider |
| Cool-Down Timer Duration | 9 seconds - limits MOSFET power dissipation during sustained overvoltage events |
| Operating Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial applications |
| GATE Drive Voltage Range | Up to 12V above OUT - ensures full enhancement of high-threshold N-channel MOSFETs |
| Shutdown Quiescent Current | <14µA - enables ultra-low-power system standby modes |
| Package Type | 8-lead 3mm × 2mm DFN - compact footprint with exposed pad for thermal management |
| Auto-Retry Behavior | Yes - recovers autonomously after fault cooldown; no SD pin toggle required |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with optional exposed pad connected to VSS.
| 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 | Pulled up internally; pulled ≥1.5V below VDD for ≥700µs to enter low-IQ shutdown |
| TIMER | Overvoltage duration timing node | Charged at 9µA; triggers fault when voltage reaches 2.8V - sets clamp time via external capacitor |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for OUT and TIMER must connect here |
| BASE | External PNP base driver | Drives PNP emitter follower to reduce RSS power dissipation in high-voltage applications |
| FB | Overvoltage regulation feedback | Senses voltage drop across RFB1; regulates OUT by maintaining 1.23V below OUT |
| OUT | Floating supply rail | Power source for internal charge pump and regulation amplifier; clamped at 5.7V |
| GATE | External MOSFET gate driver | Drives N-channel MOSFET gate up to 12V above OUT; includes fast-discharge path (200mA) |
Key Features
| Feature | Design Value |
|---|---|
| Floating topology support | Enables operation with input voltages >500V by powering regulation circuitry from MOSFET source (OUT) |
| Adjustable overvoltage clamp | Set via external resistor divider on FB pin - precise 1.23V reference enables stable regulation across wide voltage ranges |
| Auto-retry fault recovery | LTC4366-2 version resets automatically after 9-second cool-down - eliminates need for external reset logic or SD pin cycling |
| Integrated dual shunt regulators | 12V regulator on VDD and 5.7V regulator on OUT isolate internal circuitry from input surges while enabling high-voltage operation |
| Low-quiescent shutdown | Reduces total supply current to <14µA - supports always-on systems with strict power budgets |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting avionics modules from load dump and alternator overshoot in MIL-STD-704F-compliant 28V aircraft systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-channel MOSFET to clamp transient spikes to 43V while maintaining uninterrupted power delivery. Use Value: Enables continuous operation during 250V/100ms surges without resetting sensitive flight control electronics. |
Use Scenario: Securing mission-critical sensors and communication interfaces against ESD-induced bus transients in airborne platforms. IC Role / Device Role / Timing Role: High-side protector regulating output during fast-rising overvoltages using FB-controlled gate drive and TIMER-based fault timeout. Use Value: Prevents latch-up or damage in downstream ADCs and FPGAs by limiting clamped voltage to ±0.5% accuracy via 1.23V reference. |
| Industrial High-Voltage DC Distribution | Rugged Floating Topology Systems |
Use Scenario: Safeguarding PLC I/O modules and motor drives fed from unregulated 300–400V DC rails in factory automation. IC Role / Device Role / Timing Role: Overvoltage protector using external MOSFET and RSS/RIN resistors to float regulation circuitry above ground potential. Use Value: Eliminates need for isolated DC-DC converters by allowing direct connection to high-voltage buses while protecting 5V/3.3V logic supplies. |
Use Scenario: Enabling single-point protection in battery-backed backup systems where input may float significantly above chassis ground. IC Role / Device Role / Timing Role: Floating surge stopper leveraging OUT-powered charge pump and BASE-driven PNP to minimize RSS resistor power rating. Use Value: Reduces thermal stress on board-level components by shifting >90% of surge energy dissipation to external MOSFET and RSS. |
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 | Same functionality and pinout, but rated for –40°C to +85°C ambient instead of –40°C to +125°C | Suitable for commercial/industrial enclosures without under-hood or avionic thermal extremes | Select when extended temperature qualification is not required and cost optimization is prioritized |
| TPS26632RGER | Integrated MOSFET, fixed 36V OVP threshold, no adjustable FB clamp or TIMER pin; 4.5–60V input range | Better for space-constrained designs needing monolithic solution, but lacks >500V floating capability and programmable timing | Choose when board area is critical and input voltage stays below 60V; avoid for >100V surge scenarios |
Compared with LTC4366IDDB-2#TRPBF, the LTC4366HDDB-2#TRPBF provides guaranteed operation at +125°C junction temperature - essential for engine bay or avionic chassis mounting. Versus TPS26632RGER, it trades integration for extreme voltage scalability and precision programmability, enabling protection schemes impossible with fixed-threshold devices.
Availability
LTC4366HDDB-2#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 LTC4366HDDB-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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, automotive, and aerospace applications.
The LTC4366 product line is designed for high-reliability overvoltage protection in harsh environments, emphasizing floating architecture, wide input voltage tolerance (>500V), and autonomous fault recovery - targeting automotive, avionics, and industrial power distribution systems.
FAQ
What is the key functional difference between LTC4366HDDB-2#TRPBF and LTC4366HDDB-1#TRPBF?
The LTC4366HDDB-2#TRPBF implements auto-retry fault recovery: after an overvoltage event triggers shutdown, it automatically resumes operation after a fixed 9-second cool-down period. In contrast, the LTC4366HDDB-1#TRPBF latches off permanently until the SD pin is actively toggled - requiring external logic or manual reset. This makes the -2 version ideal for unattended or remote systems where intervention is impractical.
How does LTC4366HDDB-2#TRPBF achieve operation with input voltages exceeding 500V?
The LTC4366HDDB-2#TRPBF achieves >500V operation through a floating architecture: its internal regulation circuitry is powered from the OUT pin (MOSFET source), not the input rail. Dual shunt regulators (12V on VDD, 5.7V on OUT) isolate internal nodes, while external resistors (RSS, RIN) and the MOSFET absorb the bulk voltage. This decouples survival voltage from IC pin ratings - only the external MOSFET and resistors must withstand the full surge.
What is the exact overvoltage regulation reference voltage used by LTC4366HDDB-2#TRPBF?
The LTC4366HDDB-2#TRPBF uses a precision 1.23V reference for overvoltage regulation: the FB pin is regulated to 1.23V below the OUT pin voltage. This value is specified as VFB(REG) = 1.23V (min 1.193V, max 1.267V) over the full –40°C to +125°C temperature range. It enables accurate, temperature-stable output clamping set solely by the external FB resistor divider ratio.
Can LTC4366HDDB-2#TRPBF drive high-gate-charge MOSFETs effectively?
Yes - the LTC4366HDDB-2#TRPBF incorporates a charge pump that delivers 20µA to the GATE pin, enabling full enhancement of N-channel MOSFETs requiring gate drive up to 12V above the source (OUT). Its GATE pin supports fast discharge (200mA sink) and fault-state current limiting (0.25–1.25mA), ensuring robust turn-off even with large gate capacitance. Layout best practices (short traces, local 0.47µF OUT bypass) are recommended for optimal switching performance.
What thermal considerations apply to LTC4366HDDB-2#TRPBF in its DFN package?
The LTC4366HDDB-2#TRPBF in the 3mm × 2mm DFN package has θJA = 75°C/W when the exposed pad is soldered to PCB ground plane, rising to 135°C/W if unsoldered. At maximum ambient +125°C and typical 1.5W dissipation during surge, junction temperature must be verified against TJMAX = 150°C. Thermal design requires solid VSS copper area, multiple thermal vias under the exposed pad, and avoidance of nearby heat sources - especially critical in automotive under-hood deployments.
LTC4366HDDB-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)
LTC4366HDDB-2#TRPBF FAQ
1.How can I place an order for LTC4366HDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HDDB-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 LTC4366HDDB-2#TRPBF reliable?
The price and inventory of LTC4366HDDB-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 LTC4366HDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HDDB-2#TRPBF?
LTC4366HDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HDDB-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 LTC4366HDDB-2#TRPBF?
For technical support, including LTC4366HDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC4366HDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HDDB-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 LTC4366HDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HDDB-2#TRPBF?
All LTC4366HDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HDDB-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 LTC4366HDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366HDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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