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Analog Devices Inc. LTC4366HDDB-1#TRMPBF
- Part No.:
- LTC4366HDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366HDDB-1#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC4366HDDB-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. It features adjustable 43V output clamping, 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 for uninterrupted load operation under surge conditions.
For engineers reviewing the LTC4366HDDB-1#TRMPBF datasheet, LTC4366HDDB-1#TRMPBF pinout, LTC4366HDDB-1#TRMPBF application, or LTC4366HDDB-1#TRMPBF equivalent, key selection criteria include its floating topology support, FB pin regulation threshold of 1.23V, VDD shunt regulator at 11.7V, shutdown quiescent current <14µA, and DFN-8 (3mm × 2mm) package with exposed pad.
Technical Context
The LTC4366HDDB-1#TRMPBF 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 pin ratings. Its gate drive delivers 12V above OUT via a 2MHz charge pump after UVLO2 (4.75V) is reached.
Overvoltage protection uses a precision 1.23V reference referenced to OUT at the FB pin, enabling accurate clamp voltage setting via external resistor divider. A 9µA current charges the TIMER pin to 2.8V for fault latching; the LTC4366-1 variant latches off permanently until SD is toggled, unlike the auto-retry –2 version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB(REG) | 1.23V - Sets precise overvoltage clamp point via external RFB1/RFB2 divider; enables stable regulation at 43V or other user-defined levels. |
| VZ(VDD) | 11.7V - Internal shunt regulator limits VDD to safe level during startup or fault; allows use with >500V inputs when combined with RIN. |
| tD(COOL) | 9 seconds - Fixed internal cool-down period after overvoltage fault; prevents MOSFET thermal damage by enforcing low-duty-cycle operation. |
| IQ(SHUTDOWN) | <14µA - Total quiescent current in shutdown state; enables ultra-low-power system-level power gating in automotive/avionic standby modes. |
| Operating Temp | –40°C to 125°C - H-grade qualification ensures reliability in under-hood automotive, industrial DC distribution, and avionic power systems. |
| Package | 8-Lead DFN (3mm × 2mm) - Exposed pad improves thermal performance (θJA = 75°C/W when soldered); supports high-density PCB layouts in space-constrained applications. |
| UVLO2 Threshold | 4.75V - Enables charge pump activation only after OUT reaches sufficient voltage; prevents premature gate drive and ensures robust start-up sequencing. |
Pinout & Package
8-Lead (3mm × 2mm) Plastic DFN package 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 | Supplies 7.5µA gate-charge current source; clamped at 12V above VSS; no bypass capacitor required. |
| SD | Shutdown control input | Active-low enable: pulled up internally with 1.6µA; requires >1.5V drop below VDD for ≥700µs to enter shutdown. |
| TIMER | Overvoltage duration timing input | Charged with 9µA; fault latched when voltage reaches 2.8V; open-circuit yields 1µs regulation window. |
| VSS | Device return and substrate | Reference node for all regulators and amplifiers; bypass capacitors for TIMER and OUT must connect here. |
| BASE | PNP base driver output | Drives external PNP shunt transistor to reduce RSS power dissipation; tied to VSS if unused. |
| FB | Overvoltage regulation feedback | Senses voltage drop across RFB1; regulates OUT by holding FB = OUT – 1.23V; activates 200mA GATE pull-down during fast transients. |
| OUT | Charge pump & amplifier supply | Powered from MOSFET source; enables floating operation; clamped at 5.7V; requires ≥0.22µF bypass to VSS. |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate; 12V above OUT during run mode; 200mA pull-down activated during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Floating topology support | Enables operation with input voltages >500V by powering internal circuitry from OUT, isolating sensitive logic from surge energy. |
| Adjustable overvoltage clamp | Set via external RFB1/RFB2 divider using 1.23V FB reference; supports precise clamping at 43V or other user-defined levels. |
| Latch-off fault response | LTC4366-1 version holds GATE low after overvoltage fault until SD pin is cycled; prevents uncontrolled restart during persistent surges. |
| 9-second thermal cooldown | Fixed internal timer enforces mandatory MOSFET cool-down period post-fault; eliminates risk of cumulative thermal stress. |
| Ultra-low shutdown IQ | <14µA total quiescent current in shutdown state; meets stringent automotive static current requirements for always-on systems. |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting mission-critical avionics loads from lightning-induced transients on 28V DC bus. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V while maintaining uninterrupted power to flight control units. Use Value: Prevents load disruption during 250V/100ms surges per DO-160 Section 22; H-grade temp range supports wide ambient operation. |
Use Scenario: Securing navigation and communication systems against ESD and load dump in military aircraft. IC Role / Device Role / Timing Role: Overvoltage protector with latch-off behavior ensuring system remains isolated until pilot-initiated reset. Use Value: Eliminates false resets during sustained overvoltage; 9-second cooldown prevents MOSFET thermal runaway in confined airframes. |
| Industrial High-Voltage DC Distribution | Rugged Floating Power Supplies |
Use Scenario: Safeguarding PLC I/O modules fed from 300V DC distribution rails in factory automation. IC Role / Device Role / Timing Role: External MOSFET controller limiting downstream voltage to 43V during line surges. Use Value: Enables use of cost-effective 60V-rated downstream components while tolerating >500V input transients. |
Use Scenario: Building isolated, high-input-voltage power supplies for test equipment requiring floating ground references. IC Role / Device Role / Timing Role: Core regulation element in floating topology where entire IC rides at output potential. Use Value: Removes need for high-voltage level shifters or optocouplers; simplifies design and improves transient response vs transformer-based isolation. |
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#TRMPBF | Auto-retry behavior instead of latch-off; identical pinout, specs, and package. | Suitable where automatic recovery after 9s cooldown is acceptable (e.g., non-safety-critical systems). | Select LTC4366HDDB-2#TRMPBF only if fault auto-recovery is desired; LTC4366HDDB-1#TRMPBF is mandatory for systems requiring manual reset confirmation. |
| TPS26631RHFR | Integrated MOSFET, fixed 36V OVP threshold, no adjustable clamp; smaller 12-pin WQFN package. | Better suited for lower-voltage (≤60V) applications where board space is critical and external FET not needed. | Choose TPS26631RHFR for compact, integrated solutions below 60V; LTC4366HDDB-1#TRMPBF remains preferred for >100V inputs and field-adjustable clamping. |
Compared with LTC4366HDDB-2#TRMPBF, the LTC4366HDDB-1#TRMPBF provides deterministic fault containment via latch-off behavior, while TPS26631RHFR trades adjustability and high-voltage capability for integration and footprint reduction-making LTC4366HDDB-1#TRMPBF uniquely suited for ruggedized, field-configurable surge protection above 100V.
Availability
LTC4366HDDB-1#TRMPBF 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.
Supply support for LTC4366HDDB-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC4366 product line delivers high-voltage surge protection ICs designed specifically for floating, high-reliability power distribution in harsh environments such as automotive under-hood, avionics, and industrial DC infrastructure.
FAQ
What is the overvoltage clamp voltage of the LTC4366HDDB-1#TRMPBF?
The LTC4366HDDB-1#TRMPBF does not have a fixed clamp voltage-it enables user-adjustable clamping via an external resistor divider on the FB pin. The internal 1.23V reference (VFB(REG)) sets the voltage drop across RFB1, so clamp voltage equals (1 + RFB1/RFB2) × 1.23V. In typical applications, this is configured for 43V, but values from ~10V to >100V are achievable with appropriate resistors and MOSFET ratings. The LTC4366HDDB-1#TRMPBF datasheet provides design equations and layout guidance for stable regulation.
How does the LTC4366HDDB-1#TRMPBF differ from the LTC4366HDDB-2#TRMPBF?
The LTC4366HDDB-1#TRMPBF and LTC4366HDDB-2#TRMPBF share identical electrical specifications, pinout, package, and temperature rating (–40°C to 125°C), differing only in fault recovery behavior. The LTC4366HDDB-1#TRMPBF latches off permanently after an overvoltage fault and requires SD pin toggling to reset; the LTC4366HDDB-2#TRMPBF automatically retries after a fixed 9-second cool-down period. This makes the LTC4366HDDB-1#TRMPBF suitable for safety-critical systems requiring explicit operator intervention.
What package type and thermal characteristics apply to the LTC4366HDDB-1#TRMPBF?
The LTC4366HDDB-1#TRMPBF uses an 8-lead (3mm × 2mm) plastic DFN package with an exposed pad (Pin 9). When the exposed pad is soldered to PCB VSS, θJA is 75°C/W; if unsoldered, θJA rises to 135°C/W. The device's maximum junction temperature is 150°C. Thermal design must account for power dissipation in the external MOSFET and resistors (RIN, RRSS), as the LTC4366HDDB-1#TRMPBF itself consumes minimal quiescent power (<100µA in normal operation).
Can the LTC4366HDDB-1#TRMPBF operate with input voltages above 500V?
Yes-the LTC4366HDDB-1#TRMPBF is explicitly designed for "wide operating voltage range: 9V to >500V" using a floating topology. Its internal circuitry is powered from the OUT pin (MOSFET source), isolating sensitive logic from high input potentials. Input voltage limits depend solely on the external N-channel MOSFET's breakdown rating and the voltage-handling capability of RIN and RRSS. The LTC4366HDDB-1#TRMPBF datasheet confirms operation with 250V surges and notes scalability beyond 500V with appropriate component selection.
What is the purpose of the BASE pin on the LTC4366HDDB-1#TRMPBF?
The BASE pin on the LTC4366HDDB-1#TRMPBF drives the base of an external PNP transistor used to reduce power dissipation in the RSS resistor. By sourcing ~0.8µA plus PNP base current, it allows RSS to be increased by up to 35× (depending on PNP β), lowering its physical size and wattage requirement. If unused, the BASE pin must be tied to VSS. This feature is critical in high-voltage applications where RSS power loss would otherwise necessitate bulky, high-wattage resistors-making the LTC4366HDDB-1#TRMPBF especially valuable in space-constrained avionic and automotive designs.
LTC4366HDDB-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)
LTC4366HDDB-1#TRMPBF FAQ
1.How can I place an order for LTC4366HDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366HDDB-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 LTC4366HDDB-1#TRMPBF reliable?
The price and inventory of LTC4366HDDB-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 LTC4366HDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366HDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366HDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366HDDB-1#TRMPBF?
LTC4366HDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366HDDB-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 LTC4366HDDB-1#TRMPBF?
For technical support, including LTC4366HDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366HDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC4366HDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366HDDB-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 LTC4366HDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366HDDB-1#TRMPBF?
All LTC4366HDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366HDDB-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 LTC4366HDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366HDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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