Analog Devices Inc. LT4363HMS-2#TRPBF

Overview

LT4363HMS-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 100V, limits current via 50mV SNS–OUT sense threshold, and features auto-retry fault recovery (LT4363-2 variant) for industrial power systems with 4V–80V input range and –40°C to 125°C operation.

For engineers reviewing the LT4363HMS-2#TRPBF datasheet, LT4363HMS-2#TRPBF pinout, LT4363HMS-2#TRPBF application, or LT4363HMS-2#TRPBF equivalent, this page delivers verified specifications, MSOP-12 package details, OV/UV comparator thresholds, fault timer behavior, and real-world surge protection design context - all confirmed from Analog Devices' official Rev. C datasheet.

Technical Context

The LT4363HMS-2#TRPBF implements dual-fault protection using independent voltage and current regulation loops: an internal amplifier maintains 1.275V at FB during overvoltage, while a precision current-sense amplifier holds ΔVSNS at 50mV (25mV if OUT < 2V). Its adaptive fault timer charges TMR with current proportional to VCC–OUT, enabling SOA-optimized response to varying MOSFET stress.

As the -2 variant in the LT4363 family, LT4363HMS-2#TRPBF features automatic restart after cool-down (TMR falling to 0.5V), OV pin inhibition of retry during sustained overvoltage, and ENOUT latching to indicate MOSFET conduction state - distinguishing it functionally from the latch-off LT4363-1 version.

Key Specifications

Pinout & Package

LT4363HMS-2#TRPBF uses a 12-lead plastic MSOP package (4.0mm × 3.0mm × 1.1mm), thermally enhanced for high-power dissipation in industrial applications. Exposed pad is not present in MSOP variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4365IMS-2#PBF and TPS26631RGER, LT4363HMS-2#TRPBF uniquely supports 80V operation, adjustable output clamping via FB, adaptive SOA-optimized fault timing, and dual OV/UV monitoring - making it the only option for ruggedized, high-voltage, field-programmable surge protection.

Availability

LT4363HMS-2#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, and high-side battery switches requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT4363HMS-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 LT4363 product line was designed specifically for high-reliability surge protection in harsh environments - delivering adaptive fault timing, reverse-input tolerance, and wide-input operation for mission-critical power systems.

FAQ

What is the key functional difference between LT4363HMS-2#TRPBF and LT4363HMS-1#TRPBF?

The LT4363HMS-2#TRPBF implements auto-retry recovery: after fault shutdown and TMR cool-down to 0.5V, it automatically re-enables the GATE driver. In contrast, LT4363HMS-1#TRPBF latches off permanently until externally reset via SHDN pulse. This makes LT4363HMS-2#TRPBF ideal for unattended systems where manual intervention is impractical.

How does the LT4363HMS-2#TRPBF achieve adaptive fault timing based on MOSFET stress?

The LT4363HMS-2#TRPBF measures VCC–OUT voltage to infer MOSFET V_DS, then scales the TMR charging current proportionally - from ~4µA at low V_DS to 50µA at 75V. This ensures shorter fault timeouts under high-stress conditions, keeping the external MOSFET within its Safe Operating Area (SOA) without requiring complex external compensation.

Can the LT4363HMS-2#TRPBF be used with a P-channel MOSFET instead of N-channel?

No - the LT4363HMS-2#TRPBF is designed exclusively for N-channel MOSFETs, with a charge pump that drives GATE 13V above OUT. It lacks the level-shifting architecture required for high-side P-channel drive. For P-channel applications, consider the LT4364 or discrete gate-driver solutions.

What is the minimum TMR capacitor value required for stable operation of LT4363HMS-2#TRPBF?

The LT4363HMS-2#TRPBF requires a minimum 10nF capacitor on the TMR pin to ensure loop stability and proper fault timing. Smaller values may cause erratic behavior or oscillation in regulation mode. Typical designs use 100nF–1µF ceramic capacitors to set warning and shutdown delays in the millisecond-to-second range.

Does the LT4363HMS-2#TRPBF provide reverse polarity protection out-of-the-box?

The LT4363HMS-2#TRPBF itself does not block reverse current, but its –60V absolute maximum rating on VCC, SHDN, UV, and OV pins enables robust reverse-input protection when paired with back-to-back N-channel MOSFETs. This configuration replaces lossy Schottky diodes and achieves <0.1V forward drop - confirmed in Analog Devices' application notes.