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Analog Devices Inc. LTC4366MPTS8-2#TRPBF
- Part No.:
- LTC4366MPTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC4366MPTS8-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
LTC4366MPTS8-2#TRPBF 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, maintains 1.5A load current at 28V input, clamps output at 43V during surges, and features auto-retry fault recovery with 9-second cool-down. It enables rugged floating topology protection in 28V vehicle systems.
For engineers reviewing the LTC4366MPTS8-2#TRPBF datasheet, LTC4366MPTS8-2#TRPBF pinout, LTC4366MPTS8-2#TRPBF application, or LTC4366MPTS8-2#TRPBF equivalent, this device is selected for high-voltage DC distribution where uninterrupted operation during transient suppression, adjustable clamp voltage, and MOSFET gate drive timing control are critical design requirements.
Technical Context
The LTC4366MPTS8-2#TRPBF implements a floating architecture powered from the MOSFET source (OUT pin), isolating internal circuitry from input surges exceeding 500V. Its overvoltage regulation amplifier compares FB voltage to a 1.23V reference below OUT, enabling precise clamp setting via external resistor divider.
It integrates dual shunt regulators (12V on VDD, 5.7V on OUT), a 2MHz charge pump for 12V-above-source GATE drive, and a 9µA TIMER pin current that charges CT to trigger fault after programmable overvoltage duration. The -2 variant auto-retries after 9-second cool-down without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Overvoltage Clamp | Adjustable via FB divider; typical 43V output clamp during transient, set by RFB1/RFB2 ratio |
| Operating Voltage Range | 9V to >500V input; enabled by floating OUT supply and dual shunt regulators (12V on VDD, 5.7V on OUT) |
| Output Current Capability | Supports 1.5A continuous load current with external N-MOSFET; power dissipation managed by timer-limited regulation |
| Fault Recovery Mode | LTC4366MPTS8-2#TRPBF auto-retries after fixed 9-second cool-down; no manual reset required |
| Shutdown Quiescent Current | <14µA total IVDD + IOUT; achieved by internal GATE–OUT short and logic disable |
| Package & Temp Range | 8-lead TSOT-23; specified for –55°C to +125°C operating ambient (MP grade) |
| GATE Drive Capability | 12V above OUT (clamped); fast discharge current up to 300mA ensures rapid MOSFET turn-off during faults |
Pinout & Package
Package: 8-lead plastic TSOT-23 (3mm × 1.75mm), exposed pad optional to VSS, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Start-up supply input | Provides 7.5µA gate-charge current during boot; clamped at 12V above VSS; not bypassed |
| SD | Shutdown enable input | Active-low; threshold = VDD – 1.5V with 280mV hysteresis; requires 700µs low pulse to activate |
| TIMER | Overvoltage duration timer input | Charged at 9µA; fault triggered when voltage reaches 2.8V; sets clamp time via CT = 3.2nF/ms |
| VSS | Device return and substrate | Reference for all voltages; return path for OUT, TIMER, and BASE capacitors; exposed pad may connect here |
| GATE | N-MOSFET gate driver output | Drives external MOSFET gate 12V above OUT; includes 300mA fast-discharge path for rapid turn-off |
| OUT | Floating supply and regulation reference | Power source for charge pump and regulation amplifier; clamped at 5.7V; requires ≥0.22µF bypass to VSS |
| FB | Overvoltage feedback input | Senses voltage drop across RFB1; regulation amplifier holds OUT–FB = 1.23V to set clamp point |
| 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 |
|---|---|
| Rugged floating topology | Enables operation with input surges >500V by powering regulation circuitry from MOSFET source (OUT), isolating pins from high-voltage stress |
| Auto-retry fault recovery | LTC4366MPTS8-2#TRPBF automatically clears overvoltage fault and restarts after fixed 9-second cool-down, eliminating need for external reset logic |
| Adjustable overvoltage timer | Programmable clamp duration via capacitor on TIMER pin (CT = 3.2nF/ms), preventing MOSFET thermal damage during sustained overvoltage |
| Low shutdown IQ | Reduces total quiescent current to <14µA by disabling charge pump, regulation amplifier, and gate drive while maintaining latch state |
| Internal dual shunt regulators | 12V regulator on VDD and 5.7V regulator on OUT enable stable internal supplies across full input range, independent of MOSFET breakdown rating |
Applications
| 28V Vehicle Power Distribution | Avionic High-Voltage DC Bus Protection |
|---|---|
|
Use Scenario: Protecting avionics loads from load dump and alternator overshoot transients in MIL-STD-704F-compliant 28V systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp output at 43V while maintaining uninterrupted 1.5A load power. Use Value: Enables compliance with 100V/100ms transient immunity requirement without derating or oversized MOSFETs, leveraging auto-retry for mission-critical continuity. |
Use Scenario: Safeguarding flight control electronics against lightning-induced surges on aircraft 270V DC distribution buses. IC Role / Device Role / Timing Role: Floating overvoltage protector regulating output during >500V transients using external high-voltage MOSFET and RSS/RIN bias network. Use Value: Achieves >500V surge withstand by decoupling IC supply rails from input via OUT-powered architecture, eliminating reliance on MOSFET drain-source breakdown. |
| Industrial High-Voltage DC Power Systems | Ruggedized Test Equipment Power Input |
|
Use Scenario: Securing programmable logic controllers and I/O modules connected to unregulated 48–300V DC industrial power feeds. IC Role / Device Role / Timing Role: Adjustable clamp controller setting output limit via FB divider; TIMER pin configures 1–100ms regulation window before fault shutdown. Use Value: Supports wide input range (9V to >500V) with single BOM item; MP-grade temperature range (–55°C to +125°C) ensures reliability in harsh cabinet environments. |
Use Scenario: Protecting benchtop power analyzers and signal generators from accidental connection to high-voltage test sources. IC Role / Device Role / Timing Role: Fast-acting overvoltage limiter using 150ns FB-to-GATE delay and 300mA GATE pull-down to clamp within microseconds. Use Value: Prevents catastrophic failure of sensitive front-end circuitry by limiting energy delivered during fault via precise 9-second cool-down and auto-retry cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4366ITS8-2#TRPBF | Same functionality and pinout; rated for –40°C to +85°C (I-grade) instead of –55°C to +125°C (MP-grade) | Not qualified for extended temperature military/aerospace use; lower max junction temperature (125°C vs 150°C) | Select when industrial temperature range suffices and cost optimization is prioritized over extreme-environment qualification. |
| LTC4366HTS8-2#TRPBF | Same functionality and pinout; rated for –40°C to +125°C (H-grade); lacks MP-grade radiation tolerance and extended low-temp performance | Validated for automotive under-hood but not for space-grade cold-start or long-term storage below –55°C | Choose for automotive surge protection where AEC-Q100 H-grade qualification is required but full MP-grade spec is unnecessary. |
Compared with LTC4366ITS8-2#TRPBF and LTC4366HTS8-2#TRPBF, the LTC4366MPTS8-2#TRPBF provides guaranteed operation down to –55°C and up to +125°C with enhanced reliability for aerospace and defense platforms, while retaining identical electrical behavior, pin compatibility, and auto-retry functionality.
Availability
LTC4366MPTS8-2#TRPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic high-voltage DC bus protection, and industrial high-voltage DC power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4366MPTS8-2#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 delivers high-voltage surge protection ICs designed specifically for floating, ultra-wide-input (9V to >500V) power distribution systems where uninterrupted operation during transient events and robust thermal fault management are mandatory.
FAQ
What is the key functional difference between LTC4366MPTS8-2#TRPBF and LTC4366MPTS8-1#TRPBF?
The LTC4366MPTS8-2#TRPBF implements auto-retry fault recovery: after an overvoltage event triggers shutdown, it automatically clears the fault and resumes operation after a fixed 9-second cool-down period. In contrast, the LTC4366MPTS8-1#TRPBF latches off permanently until the SD pin is actively toggled low then high to reset the fault condition. Both share identical electrical specifications, pinout, and temperature range (–55°C to +125°C).
How does LTC4366MPTS8-2#TRPBF achieve >500V input surge tolerance despite its 12V absolute maximum VDD rating?
The LTC4366MPTS8-2#TRPBF achieves >500V surge tolerance through a floating architecture: its critical regulation circuitry (charge pump, amplifier, logic) is powered from the OUT pin, which connects to the MOSFET source. This isolates internal circuitry from input voltage stress - only the external MOSFET and bias resistors (RIN, RSS) experience full surge voltage, while the IC operates referenced to the regulated output rail.
What is the minimum recommended value for the TIMER capacitor (CT) on LTC4366MPTS8-2#TRPBF, and why?
The minimum recommended TIMER capacitor value for LTC4366MPTS8-2#TRPBF is 100pF. Below this, parasitic capacitance and noise susceptibility increase the risk of false triggering due to insufficient filtering of transients on the TIMER pin. The datasheet equation CT = 3.2nF/ms defines timing, but practical layout and noise margins require ≥100pF to ensure reliable 1µs minimum regulation window before fault activation.
Can LTC4366MPTS8-2#TRPBF be used with P-channel MOSFETs?
No, LTC4366MPTS8-2#TRPBF is designed exclusively for N-channel MOSFETs. Its GATE driver outputs a voltage referenced to OUT (source), providing up to 12V above OUT to fully enhance the N-MOSFET gate. Driving a P-channel device would require gate voltage below source - a capability not supported by the internal charge pump or driver architecture. Using a P-MOSFET violates the device's operational specification and will result in improper regulation or failure.
What is the role of the BASE pin on LTC4366MPTS8-2#TRPBF, and when should it be used?
The BASE pin on LTC4366MPTS8-2#TRPBF drives the base of an external PNP transistor to implement a low-current shunt regulator, reducing power dissipation in the RSS resistor. It is used when physical size or thermal constraints prevent using a high-wattage RSS resistor - connecting an external PNP allows RSS to be increased by ~35× (based on minimum PNP β), lowering power loss while maintaining required bias current for the OUT regulator.
LTC4366MPTS8-2#TRPBF 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
LTC4366MPTS8-2#TRPBF FAQ
1.How can I place an order for LTC4366MPTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4366MPTS8-2#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 LTC4366MPTS8-2#TRPBF reliable?
The price and inventory of LTC4366MPTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4366MPTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4366MPTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4366MPTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4366MPTS8-2#TRPBF?
LTC4366MPTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4366MPTS8-2#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 LTC4366MPTS8-2#TRPBF?
For technical support, including LTC4366MPTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4366MPTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC4366MPTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4366MPTS8-2#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 LTC4366MPTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4366MPTS8-2#TRPBF?
All LTC4366MPTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4366MPTS8-2#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 LTC4366MPTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4366MPTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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