Analog Devices Inc. LTC4366CTS8-1#TRMPBF

Overview

LTC4366CTS8-1#TRMPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients up to >500V using an external N-channel MOSFET. It features adjustable 43V output clamping, 9-second internal cool-down timer, latch-off fault behavior, and operates from 9V to >500V input with shutdown current <14µA. Used in 28V vehicle systems requiring uninterrupted operation during transient surges.

For engineers reviewing the LTC4366CTS8-1#TRMPBF datasheet, LTC4366CTS8-1#TRMPBF pinout, LTC4366CTS8-1#TRMPBF application, or LTC4366CTS8-1#TRMPBF equivalent, key selection criteria include overvoltage clamp adjustability via FB divider, TIMER pin programmable regulation duration, latch-off vs auto-retry behavior (–1 suffix), TSOT-23 package thermal performance, and floating topology compatibility with high-side N-MOSFET configurations.

Technical Context

The LTC4366CTS8-1#TRMPBF implements a floating architecture where OUT powers internal circuitry-including the 2MHz charge pump and overvoltage regulation amplifier-enabling operation with input voltages far exceeding its own pin ratings. Its regulation loop compares FB voltage to a 1.23V reference referenced to OUT, driving GATE to maintain precise clamp voltage across RFB1/RFB2.

It uses dual shunt regulators: a 12V VDD clamp and 5.7V OUT clamp, both powered through external resistors (RIN, RSS) to isolate internal circuitry from high-voltage transients. The TIMER pin integrates a 9µA current source charging an external capacitor to set overvoltage regulation time before latching off; the LTC4366-1 variant remains latched until SD is toggled.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (TS8), exposed pad optional, rated TJMAX = 150°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protection applications.

Compared with LTC4366CTS8-1#TRMPBF, the ITS8-1 variant extends temperature capability without changing layout or timing, while theCTS8-2 variant replaces latch-off with auto-retry-altering system-level fault response strategy and eliminating need for external SD control logic.

Availability

LTC4366CTS8-1#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 production lifecycles.

Supply support for LTC4366CTS8-1#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 automotive, avionic, and industrial power systems-enabling robust overvoltage defense using external MOSFETs instead of passive clamps.

FAQ

What is the overvoltage clamp voltage of the LTC4366CTS8-1#TRMPBF?

The LTC4366CTS8-1#TRMPBF does not have a fixed clamp voltage-it is adjustable via an external resistor divider on the FB pin. With standard values (RFB1 = 12.4kΩ, RFB2 = 422kΩ), it regulates output at 43V during overvoltage transients. The clamp point is set by the equation VCLAMP = 1.23V × (1 + RFB2/RFB1), allowing precise tuning for system-specific requirements.

How does the LTC4366CTS8-1#TRMPBF differ from the LTC4366CTS8-2#TRMPBF?

The LTC4366CTS8-1#TRMPBF latches off permanently after an overvoltage fault and requires an SD pin toggle to resume operation. In contrast, the LTC4366CTS8-2#TRMPBF automatically retries after a fixed 9-second cool-down period. Both share identical pinout, electrical specs, and package-only fault recovery behavior differs.

Can the LTC4366CTS8-1#TRMPBF operate with input voltages above 100V?

Yes-the LTC4366CTS8-1#TRMPBF is designed for floating operation and supports input voltages >500V when used with appropriately rated external components (RIN, RSS, MOSFET). Its internal circuitry is powered from OUT, isolating sensitive pins from high-voltage stress; only the external resistors and MOSFET must be rated for the full surge voltage.

What is the purpose of the BASE pin on the LTC4366CTS8-1#TRMPBF?

The BASE pin on the LTC4366CTS8-1#TRMPBF drives the base of an external PNP transistor to implement a low-current shunt regulator. This reduces power dissipation in the RSS resistor when high-voltage operation demands large resistance values-enabling physically smaller, lower-wattage resistors while maintaining safe bias current for the IC's floating supply rails.

Does the LTC4366CTS8-1#TRMPBF require a heatsink in TSOT-23 package?

No heatsink is required for typical operation-the TSOT-23 package (θJA = 195°C/W) is sufficient when power dissipation remains within limits defined by ambient temperature and PCB copper area. Thermal design must account for worst-case MOSFET conduction loss during overvoltage events; the 9-second cool-down timer inherently limits average power, reducing steady-state thermal burden.