Analog Devices Inc. LT4363IDE-2#TRPBF

Overview

LT4363IDE-2#TRPBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during transients up to 150V, limits current via 50mV SNS–OUT sense threshold, and features auto-retry fault recovery with <2% duty cycle. It operates from 4V to 80V input, supports –60V reverse input protection, and is rated for –40°C to 85°C industrial temperature range.

For engineers reviewing the LT4363IDE-2#TRPBF datasheet, LT4363IDE-2#TRPBF pinout, LT4363IDE-2#TRPBF application, or LT4363IDE-2#TRPBF equivalent, this page delivers verified specifications, DFN-12 package layout, UV/OV comparator thresholds, TMR timer behavior, and real-world surge protection design context - all confirmed against Analog Devices' Rev. C datasheet and official parametric data.

Technical Context

The LT4363IDE-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 under severe short) SNS–OUT differential sensing. Its internal charge pump drives GATE up to 13V above OUT with 14V clamp.

Fault response is governed by a VDS-dependent TMR capacitor timer: early warning at 1.275V (FLT low), shutdown at 1.375V, and auto-restart at 0.5V for LT4363-2 variant. OV pin (present only in -2 versions) inhibits retry while input remains above 1.275V threshold, preventing oscillation during sustained overvoltage.

Key Specifications

Pinout & Package

LT4363IDE-2#TRPBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed thermal pad (Pin 13 = GND). The package supports high-power dissipation (θ_JA = 43°C/W) and is RoHS-compliant, tape-and-reel packaged (#TRPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4363IDE-2#TRPBF uniquely supports 80V operation, field-adjustable output clamping, precision 50mV current limiting, and V_DS-adaptive fault timing - making it the only option qualified for avionics-grade 100V+ surge protection with full SOA management.

Availability

LT4363IDE-2#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, intrinsic safety barriers, and battery-powered medical equipment requiring stable component supply across extended temperature and surge stress conditions.

Supply support for LT4363IDE-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets since 1965.

The LT4363IDE-2#TRPBF belongs to Analog Devices' Surge Stopper® family, engineered specifically for high-reliability power path protection in harsh environments - emphasizing robustness against load dump, reverse battery, and long-duration overvoltage events.

FAQ

What is the key functional difference between LT4363IDE-2#TRPBF and LT4363IDE-1#TRPBF?

The LT4363IDE-2#TRPBF implements auto-retry fault recovery: after TMR cools down to 0.5V, it automatically restarts the external MOSFET. In contrast, LT4363IDE-1#TRPBF latches off permanently until manually reset via SHDN pulse. This makes LT4363IDE-2#TRPBF ideal for unattended systems requiring autonomous recovery from transient faults, while LT4363IDE-1#TRPBF suits safety-critical applications demanding explicit operator intervention before re-engagement.

Can LT4363IDE-2#TRPBF be used with P-channel MOSFETs?

No - LT4363IDE-2#TRPBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver is a charge pump that sources current relative to the OUT pin (source), enabling efficient N-MOSFET turn-on. Driving a P-channel device would require inverted logic, negative gate drive, and incompatible biasing - none of which are supported. Use dedicated P-channel controllers like LTC4412 for such topologies.

How does the TMR capacitor value affect fault timing in LT4363IDE-2#TRPBF?

The TMR capacitor directly sets three timing intervals: early warning duration (≈16.67ms/µF), total regulation time before shutdown (≈96.9ms/µF at V_DS = 75V), and cool-down period (≈15.5ms/µF). Larger capacitors extend all phases linearly, allowing designers to tune protection aggressiveness - e.g., 100nF yields ~1.7ms warning, while 1µF provides ~17ms - ensuring optimal balance between ride-through capability and MOSFET SOA preservation in LT4363IDE-2#TRPBF designs.

What is the maximum allowable voltage difference between SNS and OUT pins on LT4363IDE-2#TRPBF?

The absolute maximum voltage difference between SNS and OUT pins on LT4363IDE-2#TRPBF is ±30V, as specified in the Absolute Maximum Ratings table. Exceeding this risks permanent damage to the internal current sense amplifier. In practice, the SNS–OUT differential is regulated to 50mV (or 25mV during severe shorts), so the 30V limit primarily guards against fault conditions like open-circuit sense resistors or wiring errors - not normal operation.

Does LT4363IDE-2#TRPBF require external components for basic overvoltage protection?

Yes - LT4363IDE-2#TRPBF requires at minimum: one external N-channel MOSFET (e.g., FDB33N25), a TMR timing capacitor, FB resistive divider (for clamp voltage setting), and SNS–OUT current sense resistor. Additional components like UV/OV pull-up resistors, ENOUT pull-up, and input filtering are recommended for robust operation. Unlike integrated solutions, LT4363IDE-2#TRPBF's flexibility comes from external component selection - enabling optimization for voltage, current, thermal, and transient requirements.