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Analog Devices Inc. LTC4366CDDB-1#TRMPBF
- Part No.:
- LTC4366CDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4366CDDB-1#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
LTC4366CDDB-1#TRMPBF 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 9V to >500V input range. It is used in 28V vehicle systems requiring uninterrupted operation under transient surges.
For engineers reviewing the LTC4366CDDB-1#TRMPBF datasheet, LTC4366CDDB-1#TRMPBF pinout, LTC4366CDDB-1#TRMPBF application, or LTC4366CDDB-1#TRMPBF equivalent, key selection criteria include its latched-off fault response, floating topology support, 0°C to 70°C temperature grade, DFN-8 (3mm × 2mm) package, and compatibility with high-voltage DC distribution architectures.
Technical Context
The LTC4366CDDB-1#TRMPBF implements a floating architecture where regulation circuitry is powered from the MOSFET source (OUT pin), enabling operation up to the MOSFET's breakdown voltage - not limited by IC pin ratings. Its overvoltage regulation amplifier maintains FB = OUT – 1.23V, controlling gate drive to clamp output at user-defined voltage via RFB1/RFB2.
It uses dual shunt regulators (VDD clamped at 11.7V typ, OUT clamped at 5.5V typ) and a charge pump (2MHz) to drive GATE 12V above OUT. The TIMER pin enables programmable overvoltage duration (default 1µs; capacitor sets 311ms/µF), after which it triggers a 9-second cool-down before latching off (LTC4366-1 variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Response | Regulates output at user-set voltage (e.g., 43V) during transient; drops excess voltage across external MOSFET while load remains powered. |
| Fault Behavior | LTC4366-1 variant latches off after overvoltage timeout; requires SD pin toggle to reset - prevents uncontrolled re-engagement. |
| Operating Voltage Range | Supports input supply from 9V to >500V via floating topology - VDD and OUT pins internally shunt-regulated (11.7V and 5.5V typical). |
| Package & Temp Grade | 8-lead (3mm × 2mm) plastic DFN; commercial grade (0°C to 70°C ambient) - validated for industrial and 28V vehicle system deployment. |
| Shutdown Quiescent Current | Reduces total IVDD + IOUT to <20µA when SD pulled >1.5V below VDD - enables low-power standby in battery-backed systems. |
| GATE Drive Capability | Drives external N-MOSFET gate up to 12V above OUT; includes fast discharge (200mA sink) and charge pump (20µA source) for full enhancement. |
| Protection Timers | Adjustable overvoltage timer (via TIMER pin capacitor); fixed 9-second cool-down period ensures MOSFET thermal recovery before reset attempt. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB), exposed pad (optional VSS connection), θJA = 75°C/W when VSS soldered to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped at 11.7V - powers logic and timer when MOSFET is off. |
| SD | Shutdown control input | Active-low enable: pulled up internally (1.6µA); requires >700µs low pulse >1.5V below VDD to enter <20µA shutdown state. |
| TIMER | Overvoltage duration setting | Charged at 9µA; fault triggered when voltage reaches 2.8V - capacitor value sets regulation window (311ms/µF). |
| VSS | Device return and substrate | Reference for all voltages; bypass capacitors for OUT and TIMER must connect here; exposed pad may be tied to VSS. |
| BASE | PNP base driver output | Connects to external PNP emitter (collector grounded) to reduce RSS power dissipation in high-voltage applications. |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds FB = OUT – 1.23V - sets output clamp voltage via resistor divider. |
| OUT | Charge pump & regulation supply | Powered from MOSFET source; enables floating operation; clamped at 5.5V; supplies regulation amp and charge pump. |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate; includes 200mA fast-discharge path during overvoltage; clamped 12V above OUT. |
Key Features
| Feature | Design Value |
|---|---|
| Floating topology support | Enables >500V input protection by powering regulation circuitry from MOSFET source (OUT), isolating IC from input surge. |
| Adjustable overvoltage clamp | Output regulated at precise voltage (e.g., 43V) via external RFB1/RFB2 divider - no internal reference dependency on supply rail. |
| Latched-off fault response | LTC4366-1 variant remains disabled after overvoltage timeout until SD pin is actively toggled - prevents unsafe auto-restart. |
| Thermally managed protection | 9-second cool-down timer ensures MOSFET junction temperature recovers before reset - avoids cumulative thermal stress. |
| Low-quiescent shutdown | Reduces combined IVDD + IOUT to <20µA in shutdown - preserves battery life in always-on vehicle or avionic systems. |
Applications
| 28V Vehicle Power Distribution | Avionic High-Voltage DC Bus |
|---|---|
Use Scenario: Protecting flight control electronics from 250V transients on MIL-STD-704-compliant 28V aircraft bus. IC Role / Device Role / Timing Role: Surge stopper regulating output at 43V while maintaining uninterrupted power to critical loads. Use Value: Prevents MOSFET destruction during lightning-induced surges; latched-off behavior avoids uncontrolled restart during fault persistence. |
Use Scenario: Safeguarding navigation computers against load-dump spikes in airborne power systems with >400V transient capability. IC Role / Device Role / Timing Role: Floating overvoltage protector controlling external N-MOSFET gate to clamp output during EMI-coupled transients. Use Value: Enables use of cost-effective 600V MOSFETs without derating; DFN-8 package supports compact, high-density avionic board layouts. |
| Industrial High-Voltage DC Links | Rugged Floating Power Supplies |
Use Scenario: Securing PLC I/O modules connected to 300V DC distribution rails in factory automation systems. IC Role / Device Role / Timing Role: Overvoltage regulator with programmable timer limiting MOSFET conduction time during sustained overvoltage events. Use Value: Eliminates need for bulky TVS diodes; 9-second cool-down prevents thermal runaway in enclosed enclosures. |
Use Scenario: Building isolated, wide-input-range power supplies for test equipment operating from 12V to 500V sources. IC Role / Device Role / Timing Role: Core surge management IC enabling floating topology with external PNP-assisted RSS current reduction. Use Value: Reduces physical size of voltage-dropping resistors by 35× using BASE-driven PNP - critical for portable instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366IDDB-1#TRMPBF | Same functionality and pinout; extended temperature range (–40°C to 85°C) vs. LTC4366CDDB-1#TRMPBF's 0°C to 70°C. | Required for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select when operating environment exceeds commercial temperature limits; otherwise LTC4366CDDB-1#TRMPBF is optimal for cost-sensitive 28V vehicle cabin systems. |
| LTC4366CDDB-2#TRMPBF | Identical package and specs except auto-retry fault behavior (9-second cool-down then automatic restart) vs. latch-off of LTC4366CDDB-1#TRMPBF. | Suitable for non-critical loads where brief interruption is acceptable; unsuitable for safety-critical systems requiring manual fault acknowledgment. | Choose LTC4366CDDB-2#TRMPBF only if system-level fault handling permits autonomous recovery; LTC4366CDDB-1#TRMPBF is preferred for deterministic, operator-controlled reset. |
Compared with LTC4366IDDB-1#TRMPBF, the LTC4366CDDB-1#TRMPBF offers lower cost and smaller thermal footprint in commercial-temperature applications; versus LTC4366CDDB-2#TRMPBF, it provides fail-safe latched behavior essential for mission-critical power domains where unattended restart is prohibited.
Availability
LTC4366CDDB-1#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC distribution, and industrial high-voltage power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC4366CDDB-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 (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 optimized for floating topologies in aerospace, automotive, and industrial power systems - enabling robust overvoltage resilience without compromising load uptime.
FAQ
What is the fault response behavior of the LTC4366CDDB-1#TRMPBF?
The LTC4366CDDB-1#TRMPBF implements a latched-off fault response: upon overvoltage timeout, it disables the external MOSFET and remains off until the SD pin is actively toggled low then high. This prevents uncontrolled re-engagement during persistent overvoltage conditions and is distinct from the auto-retry behavior of the LTC4366CDDB-2#TRMPBF variant. The latch ensures deterministic system-level fault handling in safety-critical applications.
How does the LTC4366CDDB-1#TRMPBF achieve >500V input capability despite its 12V-rated pins?
The LTC4366CDDB-1#TRMPBF achieves >500V input capability through a floating architecture: its regulation circuitry is powered from the MOSFET source (OUT pin), not the input rail. VDD and OUT pins are internally shunt-regulated (11.7V and 5.5V typical), isolating sensitive circuitry from input transients. The external MOSFET bears the full surge voltage, while the LTC4366CDDB-1#TRMPBF only sees clamped, safe internal rails - enabling protection far beyond its pin voltage ratings.
What is the role of the BASE pin on the LTC4366CDDB-1#TRMPBF?
The BASE pin on the LTC4366CDDB-1#TRMPBF drives the base of an external PNP transistor to reduce power dissipation in the RSS resistor. By sourcing ~0.8µA plus PNP base current, it allows RSS values up to 35× larger than in standard configurations - significantly shrinking resistor size and thermal footprint in high-voltage applications like avionic DC buses. When unused, BASE must be tied to VSS.
Can the LTC4366CDDB-1#TRMPBF regulate output voltage at precisely 43V?
Yes - the LTC4366CDDB-1#TRMPBF regulates output voltage at precisely 43V (or any user-defined level) using the FB pin feedback network. The overvoltage regulation amplifier holds FB = OUT – 1.23V; selecting RFB1 = 12.4kΩ and RFB2 = 422kΩ (as shown in the典型 application) sets VOUT = 1.23V × (1 + RFB2/RFB1) ≈ 43V. This ratio-based clamping is stable across temperature and supply variations.
What is the purpose of the TIMER pin on the LTC4366CDDB-1#TRMPBF?
The TIMER pin on the LTC4366CDDB-1#TRMPBF controls overvoltage regulation duration: during clamping, it charges at 9µA until reaching 2.8V, triggering fault shutdown. With no capacitor, regulation lasts ~1µs; adding CT = 8.2nF extends it to ~25.5ms (311ms/µF rule). This prevents MOSFET thermal damage during sustained overvoltage - a critical safeguard absent in basic crowbar solutions.
LTC4366CDDB-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)
LTC4366CDDB-1#TRMPBF FAQ
1.How can I place an order for LTC4366CDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366CDDB-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 LTC4366CDDB-1#TRMPBF reliable?
The price and inventory of LTC4366CDDB-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 LTC4366CDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366CDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366CDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366CDDB-1#TRMPBF?
LTC4366CDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366CDDB-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 LTC4366CDDB-1#TRMPBF?
For technical support, including LTC4366CDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366CDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC4366CDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366CDDB-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 LTC4366CDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366CDDB-1#TRMPBF?
All LTC4366CDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366CDDB-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 LTC4366CDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366CDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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