Analog Devices Inc. LTC4366MPTS8-2#TRMPBF

Overview

LTC4366MPTS8-2#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 auto-retry fault recovery, 9-second internal cool-down timer, adjustable overvoltage clamp (via FB divider), and operates across –55°C to +125°C. It is used in 28V vehicle systems requiring uninterrupted operation during transient surges.

For engineers reviewing the LTC4366MPTS8-2#TRMPBF datasheet, LTC4366MPTS8-2#TRMPBF pinout, LTC4366MPTS8-2#TRMPBF application, or LTC4366MPTS8-2#TRMPBF equivalent, key selection criteria include its –55°C to +125°C MP-grade temperature range, TSOT-23-8 package, auto-retry (–2) version behavior, 1.23V FB regulation threshold, and 9-second cool-down timing-critical for rugged industrial and avionic DC distribution designs.

Technical Context

The LTC4366MPTS8-2#TRMPBF implements a floating topology where its OUT and BASE pins are powered from the MOSFET source, enabling operation with input voltages far exceeding its own pin ratings. Its overvoltage regulation amplifier compares FB to OUT − 1.23V and drives GATE to clamp output, while a 9µA current charges the TIMER pin to trigger fault after programmable delay.

Unlike latch-off variants, the –2 suffix denotes auto-retry functionality: after a 9-second cool-down period, it autonomously clears the fault and re-enables the external MOSFET without SD pin intervention. The device uses dual shunt regulators (12V on VDD, 5.7V on OUT) and a charge pump to drive GATE 12V above OUT, ensuring robust gate control under high-side floating conditions.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (0.65mm pitch), exposed pad optional for thermal relief. Pin 1 = VDD, Pin 2 = SD, Pin 3 = TIMER, Pin 4 = VSS, Pin 5 = BASE, Pin 6 = FB, Pin 7 = OUT, Pin 8 = GATE.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4366ITS8-2#TRMPBF and LTC4366HTS8-2#TRMPBF, the LTC4366MPTS8-2#TRMPBF uniquely supports full operational functionality from –55°C to +125°C with MIL-STD-883-tested reliability - making it the only choice for mission-critical avionics, space-grade power interfaces, and downhole tooling where cold-start and radiation-tolerant performance are mandatory.

Availability

LTC4366MPTS8-2#TRMPBF is available at Aetrix Electronics and suitable for 28V vehicle systems, avionic DC bus protection, industrial HV DC distribution, and downhole oil & gas electronics requiring stable component supply across extreme temperature ranges and long production lifecycles.

Supply support for LTC4366MPTS8-2#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.

The LTC4366 family is designed specifically for high-voltage, floating-surge protection in safety-critical power systems - emphasizing robustness, wide temperature operation, and autonomous fault recovery without host intervention.

FAQ

What is the key functional difference between LTC4366MPTS8-2#TRMPBF and LTC4366MPTS8-1#TRMPBF?

The LTC4366MPTS8-2#TRMPBF implements auto-retry fault recovery: after a 9-second cool-down period, it automatically clears the overvoltage fault and re-enables the external MOSFET. In contrast, the LTC4366MPTS8-1#TRMPBF latches off permanently until the SD pin is toggled low then high to manually reset the fault condition - requiring external control logic or user intervention.

How does the LTC4366MPTS8-2#TRMPBF achieve operation with input voltages exceeding 500V?

The LTC4366MPTS8-2#TRMPBF achieves >500V operation via a floating architecture: its OUT and BASE pins are powered from the source of the external N-channel MOSFET, not the input rail. This isolates internal circuitry from the high-voltage input, while dual shunt regulators (12V on VDD, 5.7V on OUT) and a charge pump ensure reliable gate drive and regulation regardless of input level.

What is the role of the TIMER pin on the LTC4366MPTS8-2#TRMPBF, and how is it configured?

The TIMER pin on the LTC4366MPTS8-2#TRMPBF sets the maximum duration of overvoltage regulation before fault activation. It is charged at 9µA; when voltage reaches 2.8V, the part initiates fault shutdown. A capacitor from TIMER to VSS sets timing per CT = 3.2 nF/ms - e.g., 100nF yields ~31ms regulation window before cool-down begins.

Why does the LTC4366MPTS8-2#TRMPBF use two separate shunt regulators (VDD and OUT)?

The LTC4366MPTS8-2#TRMPBF uses independent 12V (VDD) and 5.7V (OUT) shunt regulators to decouple start-up and run-mode power domains. During start-up, VDD's 12V clamp powers initial logic and gate charging; once OUT rises above UVLO2 (4.75V), the 5.7V OUT clamp takes over to supply the charge pump and regulation amplifier - enabling seamless transition and stable floating operation.

Can the LTC4366MPTS8-2#TRMPBF be used with P-channel MOSFETs?

No - the LTC4366MPTS8-2#TRMPBF is explicitly designed to drive external N-channel MOSFETs in high-side configuration. Its GATE driver outputs up to 12V above OUT, optimized for N-MOSFET enhancement. Driving a P-channel device would require inverted logic, reverse voltage handling, and incompatible gate drive polarity - not supported by the internal architecture or pin functions.