Analog Devices Inc. LT4363MPMS-2#TRPBF

Overview

LT4363MPMS-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 150V, limits current via 50mV SNS–OUT sense threshold, and features auto-retry (LT4363-2) with <2% duty cycle during sustained faults. It operates from 4V to 80V input, supports –55°C to 125°C extended temperature range, and is used in avionic power rails requiring robust fault recovery.

For engineers reviewing the LT4363MPMS-2#TRPBF datasheet, LT4363MPMS-2#TRPBF pinout, LT4363MPMS-2#TRPBF application, or LT4363MPMS-2#TRPBF equivalent, this page delivers verified specifications, MSOP-12 package mapping, UV/OV comparator thresholds, fault timer behavior, and real-world surge protection design context - all confirmed against Analog Devices' Rev. C datasheet and product documentation.

Technical Context

The LT4363MPMS-2#TRPBF implements dual-fault protection: overvoltage regulation via FB-servo loop holding 1.275V at feedback pin (adjustable clamp), and overcurrent limiting via precision 50mV (or 25mV below 2V OUT) SNS–OUT differential sensing. Its TMR pin uses V_CC–V_OUT-dependent current sources - scaling from ~4µA to 50µA for OV and ~8µA to 260µA for OC - enabling dynamic SOA-aware timing.

As the MP-grade LT4363-2 variant in 12-lead MSOP, it integrates UV/OV comparators (1.275V thresholds, 12mV/7.5mV hysteresis), a 14V GATE clamp, reverse-input tolerance to –60V, and SHDN pin rated from –60V to 100V. The auto-restart logic triggers GATE turn-on only after TMR discharges to 0.5V *and* OV pin falls below threshold - preventing motorboating under sustained overvoltage.

Key Specifications

Pinout & Package

LT4363MPMS-2#TRPBF is housed in a 12-lead plastic MSOP package (4.0mm × 3.0mm footprint, 0.65mm pitch), with exposed pad optional for thermal enhancement. Pin 1 is marked by dot; pin numbering follows standard MSOP convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4365IMS-2#PBF and TPS26632RGER, LT4363MPMS-2#TRPBF provides unique high-voltage resilience (80V operating, 150V surge), full external MOSFET control for optimal SOA management, and MP-grade temperature support - making it the only option for avionics-grade transient protection with adaptive fault timing.

Availability

LT4363MPMS-2#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap systems, intrinsic safety barriers, and battery-powered telematics requiring stable component supply across extended temperature and high-reliability environments.

Supply support for LT4363MPMS-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.

The LT4363MPMS-2#TRPBF belongs to ADI's Linear Technology surge protection portfolio, engineered specifically for mission-critical power systems demanding wide-input operation, precise fault timing, and extreme environmental reliability.

FAQ

What is the key functional difference between LT4363MPMS-2#TRPBF and LT4363MPMS-1#TRPBF?

The LT4363MPMS-2#TRPBF implements auto-restart behavior after fault cooldown: once the TMR pin discharges to 0.5V, the GATE pin turns on automatically if the OV pin is below threshold. In contrast, LT4363MPMS-1#TRPBF latches off permanently until manually reset via SHDN pulse. This makes LT4363MPMS-2#TRPBF ideal for unattended systems where continuous fault recovery is required without host intervention.

How does the TMR capacitor value affect fault timing in LT4363MPMS-2#TRPBF?

The TMR capacitor (CTMR) directly sets three timing intervals in LT4363MPMS-2#TRPBF: early warning duration (t_WARNING ≈ 16.67ms/µF), total regulation time before shutdown (t_REG ≈ 96.9ms/µF at V_DS = 75V), and cool-down period (t_COOL ≈ 15.5ms/µF). Because TMR charging current scales with V_CC–V_OUT, CTMR selection must account for worst-case V_DS to ensure MOSFET stays within SOA during sustained overvoltage.

Can LT4363MPMS-2#TRPBF be used with P-channel MOSFETs?

No - LT4363MPMS-2#TRPBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver is a charge-pump-based source follower referenced to the OUT pin, providing gate voltage up to 13V above OUT. Driving a P-channel device would require inverted logic and negative gate drive relative to source, which the LT4363MPMS-2#TRPBF does not support.

What is the purpose of the OV pin on LT4363MPMS-2#TRPBF, and how should it be used?

The OV pin on LT4363MPMS-2#TRPBF disables auto-restart if held above 1.275V, preventing oscillation ("motorboating") during sustained overvoltage. It should be connected to a resistive divider from V_CC to set a custom overvoltage trip point (e.g., 36V), or tied to GND if unused. Unlike UV, OV has no hysteresis and is active only during retry - it does not affect initial turn-on behavior.

Does LT4363MPMS-2#TRPBF require external components for basic overvoltage protection?

Yes - LT4363MPMS-2#TRPBF requires at minimum: (1) an external N-channel MOSFET, (2) FB resistive divider to set output clamp voltage, (3) TMR capacitor to define fault timing, (4) SNS–OUT current sense resistor, and (5) bypass capacitors on VCC and OUT. These components enable its core functions: regulated clamping, current limiting, adaptive timing, and MOSFET gate control - no internal FET or reference dividers are integrated.