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Analog Devices Inc. LTC4366ITS8-2#TRMPBF
- Part No.:
- LTC4366ITS8-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366ITS8-2#TRMPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
LTC4366ITS8-2#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, maintaining load operation while dropping excess voltage across the MOSFET. It features auto-retry fault recovery, adjustable 1.23V FB regulation threshold, 9-second internal cool-down timer, and operates from –40°C to +85°C in an 8-lead TSOT-23 package.
For engineers reviewing the LTC4366ITS8-2#TRMPBF datasheet, LTC4366ITS8-2#TRMPBF pinout, LTC4366ITS8-2#TRMPBF application, or LTC4366ITS8-2#TRMPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and timing behavior, and real-world implementation constraints for rugged DC distribution systems.
Technical Context
The LTC4366ITS8-2#TRMPBF implements a floating topology where VDD, OUT, and BASE pins are independently shunt-regulated (12V, 5.7V, and 6.2V respectively), enabling operation with input voltages exceeding 500V. Its overvoltage regulation amplifier compares FB to OUT–1.23V and drives GATE to clamp output at user-defined voltage via RFB1/RFB2 divider.
It uses dual-stage gate control: a 7.5µA VDD-sourced current initiates MOSFET turn-on, then a 2MHz charge pump boosts GATE to 12V above OUT once UVLO2 (4.75V) is crossed. During overvoltage, a 200mA GATE-to-OUT pull-down activates before regulation, and TIMER pin charging (9µA) triggers fault latching at 2.8V - followed by 9-second cool-down and auto-retry (LTC4366-2 variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Regulation Threshold | 1.23V below OUT pin - sets precise clamp voltage via external resistor divider (RFB1/RFB2) |
| Cool-Down Timer Duration | 9 seconds - prevents MOSFET thermal runaway after overvoltage fault; auto-retry resumes operation |
| Supply Voltage Range (VDD) | 4.5V to 12V - powered by internal 12V shunt regulator; no external bypass capacitor required |
| GATE Drive Capability | 12V above OUT - enables full enhancement of high-voltage N-channel MOSFETs with low RDS(on) |
| Shutdown Quiescent Current | <14µA - achieved by pulling GATE to OUT; reduces system standby power in vehicle or avionic applications |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and automotive environments per LTC4366I grade |
| Package | 8-lead TSOT-23 - compact footprint with exposed pad option; θJA = 195°C/W (no PCB soldering to VSS) |
Pinout & Package
Package: 8-lead plastic TSOT-23 (0.65mm pitch), 2.9mm × 1.6mm × 0.8mm profile, exposed pad optional for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Clamped at 12V above VSS; sources 7.5µA gate charge current; no bypass capacitor permitted |
| SD | Shutdown enable input | Active-low comparator with 1.5V hysteresis below VDD; requires ≥700µs low pulse to enter shutdown (<14µA IQ) |
| TIMER | Overvoltage duration control | Charged at 9µA; fault triggered at 2.8V; capacitor value sets regulation time (CT = 3.2nF/ms) |
| VSS | Device return and substrate | Reference for all voltages; connects to PCB ground plane; bypass capacitors on TIMER/OUT must return here |
| GATE | N-channel MOSFET gate driver | Drives external FET gate to 12V above OUT; includes 200mA pull-down during fast overvoltage events |
| OUT | Floating circuitry supply | Clamped at 5.7V above VSS; powers charge pump and regulation amplifier; requires ≥0.22µF bypass to VSS |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds OUT–FB = 1.23V ±30mV over temperature |
| BASE | External PNP base driver | Connects to anode of internal 6.2V Zener; enables low-current shunt regulation using external PNP transistor |
Key Features
| Feature | Design Value |
|---|---|
| Floating high-voltage operation | Supports >500V input via independent VDD/OUT/BASE shunt regulators - isolates internal circuitry from surge energy |
| Auto-retry fault recovery | LTC4366-2 variant clears overvoltage fault automatically after 9-second cool-down - eliminates manual reset in remote systems |
| Adjustable overvoltage clamp | User-configurable output regulation point via RFB1/RFB2 divider - enables precise clamping at 43V, 100V, or other values |
| Low-power shutdown mode | Reduces total quiescent current to <14µA - critical for battery-backed or always-on 28V vehicle systems |
| Robust gate drive architecture | Combines bootstrap start-up (7.5µA) and 2MHz charge pump - ensures reliable MOSFET turn-on even under high dV/dt conditions |
Applications
| 28V Vehicle Power Distribution | Avionic DC Bus Protection |
|---|---|
Use Scenario: Protecting mission-critical avionics loads from 250V lightning-induced surges on MIL-STD-704F compliant 28V DC buses. IC Role / Device Role / Timing Role: Surge stopper controlling external IXTK90N25L2 MOSFET to clamp output at 43V while maintaining uninterrupted power to flight control units. Use Value: Enables continuous operation during transient events without brownout or latch-up - meets DO-160 Section 22 Level 3 surge immunity requirements. |
Use Scenario: Securing radar and communication subsystems against load dump and alternator overshoot in airborne platforms. IC Role / Device Role / Timing Role: Regulates output during 100ms, 100V transients by modulating MOSFET conduction; 9-second cool-down prevents thermal failure. Use Value: Eliminates need for bulky TVS diodes or sacrificial fuses - reduces BOM count and improves long-term reliability in sealed avionics enclosures. |
| Industrial High-Voltage DC Distribution | Rugged Floating Topology Systems |
Use Scenario: Protecting PLC I/O modules and sensors in factory automation systems fed from 300–400V DC microgrids. IC Role / Device Role / Timing Role: Controls high-side N-channel MOSFET to limit downstream voltage to 48V during line faults, using RSS/RIN resistive droppers. Use Value: Achieves >500V standoff capability with standard 60V-rated MOSFETs - lowers component cost versus discrete SiC solutions. |
Use Scenario: Enabling isolated power delivery in floating-ground test equipment or HV battery monitoring circuits. IC Role / Device Role / Timing Role: Uses BASE pin to drive external PNP shunt regulator - reduces RSS resistor power dissipation by 35× versus passive design. Use Value: Allows use of physically smaller, lower-wattage resistors in space-constrained enclosures - improves thermal margin and manufacturability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366ITS8-1#TRMPBF | Latches off permanently after overvoltage fault; requires SD pin toggle to reset | Suitable for safety-critical systems requiring manual intervention before restart | Select LTC4366ITS8-1#TRMPBF only when fault persistence is mandatory for system diagnostics or hazard mitigation |
| TPS26631RGER | Integrated 60V MOSFET; fixed 36V overvoltage clamp; no external TIMER capacitor needed | Better suited for ≤60V systems with space constraints; lacks >500V floating capability | Choose TPS26631RGER for compact 24V/48V industrial designs where external MOSFET control is unnecessary |
Compared with LTC4366ITS8-1#TRMPBF, the LTC4366ITS8-2#TRMPBF provides autonomous recovery ideal for unattended systems, while TPS26631RGER trades flexibility for integration - making LTC4366ITS8-2#TRMPBF the only choice for >100V floating surge protection with programmable timing.
Availability
LTC4366ITS8-2#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 and long production lifecycles.
Supply support for LTC4366ITS8-2#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 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-topology power distribution in automotive, avionic, and industrial systems where input transients exceed 500V.
FAQ
What is the key functional difference between LTC4366ITS8-2#TRMPBF and LTC4366ITS8-1#TRMPBF?
The LTC4366ITS8-2#TRMPBF implements auto-retry fault recovery: after an overvoltage event, it enters a 9-second cool-down period and then automatically resumes operation. In contrast, the LTC4366ITS8-1#TRMPBF latches off permanently and requires an external SD pin toggle to clear the fault. This makes LTC4366ITS8-2#TRMPBF ideal for remote or unattended systems where manual reset is impractical.
How does LTC4366ITS8-2#TRMPBF achieve >500V input capability despite its 12V VDD rating?
The LTC4366ITS8-2#TRMPBF achieves >500V operation through a floating architecture: VDD, OUT, and BASE pins each have independent internal shunt regulators (12V, 5.7V, and 6.2V respectively). The external N-channel MOSFET isolates surge energy from the IC's power pins, allowing the device to operate safely as long as the MOSFET's breakdown voltage exceeds the transient - not the IC's pin ratings.
What is the minimum input voltage required to start up LTC4366ITS8-2#TRMPBF with a full 1.5A load?
The minimum startup voltage for LTC4366ITS8-2#TRMPBF depends on RIN, RSS, MOSFET threshold (VTH), Schottky drop (VD), and C1 charging requirement (4.75V). Using typical values - RIN = 324kΩ, RSS = 46.4kΩ, VTH = 3V, VD = 0.58V - the calculated VIN(MIN) is approximately 22.3V. Below this, insufficient C1 charging causes prolonged MOSFET linear-mode operation and potential thermal damage.
Can LTC4366ITS8-2#TRMPBF be used with P-channel MOSFETs?
No, LTC4366ITS8-2#TRMPBF is explicitly designed to drive external N-channel MOSFETs in high-side configuration. Its GATE driver outputs voltage referenced to OUT (not VSS), and its regulation loop assumes source-follower topology. Driving a P-channel device would invert control polarity and disable overvoltage regulation - the datasheet specifies N-channel compatibility only.
What happens to the GATE pin during an output short-circuit event on LTC4366ITS8-2#TRMPBF?
During an output short, the GATE pin may be driven high by stored charge in CG while OUT collapses - risking damage to the internal 10–12V GATE-to-OUT clamp. To prevent this, Analog Devices recommends adding a 1kΩ series resistor (RS) between CG and GATE, plus a bypass diode, as shown in Figure 3 of the datasheet. This limits discharge current and protects the clamp structure in LTC4366ITS8-2#TRMPBF.
LTC4366ITS8-2#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- TSOT-23-8
LTC4366ITS8-2#TRMPBF FAQ
1.How can I place an order for LTC4366ITS8-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366ITS8-2#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 LTC4366ITS8-2#TRMPBF reliable?
The price and inventory of LTC4366ITS8-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366ITS8-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4366ITS8-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366ITS8-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366ITS8-2#TRMPBF?
LTC4366ITS8-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366ITS8-2#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 LTC4366ITS8-2#TRMPBF?
For technical support, including LTC4366ITS8-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366ITS8-2#TRMPBF requirements.
6.How does Aetrix verify that LTC4366ITS8-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366ITS8-2#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 LTC4366ITS8-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4366ITS8-2#TRMPBF?
All LTC4366ITS8-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366ITS8-2#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 LTC4366ITS8-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4366ITS8-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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