Analog Devices Inc. LT4363IS-1#TRPBF

Overview

LT4363IS-1#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 100V, limits current via 50mV SNS–OUT sense threshold, and features latch-off fault behavior (LT4363-1 variant) for industrial power supply protection in avionics and hot-swap systems.

For engineers reviewing the LT4363IS-1#TRPBF datasheet, LT4363IS-1#TRPBF pinout, LT4363IS-1#TRPBF application, or LT4363IS-1#TRPBF equivalent, this page delivers verified specifications including 4V–80V operating range, 1.275V FB reference, 12-pin SO package with GATE drive capability up to 13V above OUT, and precise UV/OV comparator thresholds at 1.275V ±15mV.

Technical Context

The LT4363IS-1#TRPBF implements dual-loop protection: a voltage servo loop (FB input, 1.275V reference) regulates GATE to clamp output during overvoltage, while a current servo loop (SNS–OUT differential, 50mV target) limits load current. Fault timing is dynamically scaled by V_DS = V_CC – V_OUT, enabling adaptive MOSFET SOA protection.

As the -1 variant, it latches off after fault timeout - GATE and FLT remain low until manual reset via SHDN ≤ 0.4V for ≥100µs. It supports reverse input protection to –60V, shutdown current <7µA, and operates across –40°C to +85°C in 16-pin SO packaging.

Key Specifications

Pinout & Package

LT4363IS-1#TRPBF is housed in a 16-lead plastic SO package (S package), with exposed thermal pad not applicable (SO variant). Pin functions are electrically defined per Analog Devices' LT4363 Rev. C datasheet, with GND pins at positions 7 and 14, and critical control pins distributed to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT4363HS-1#TRPBF and LT4363IMS-1#TRPBF, the LT4363IS-1#TRPBF offers optimal cost-performance balance for industrial systems operating up to +85°C with standard SO packaging and proven thermal derating at 80°C/W.

Availability

LT4363IS-1#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, and intrinsic safety barrier designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LT4363IS-1#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 precision instrumentation, industrial automation, and aerospace markets.

The LT4363 product line delivers robust, high-voltage surge protection and current limiting for mission-critical power systems - designed specifically for avionics, industrial control, and safety-certified equipment where reliability under extreme transients is non-negotiable.

FAQ

What is the key functional difference between LT4363IS-1#TRPBF and LT4363IS-2#TRPBF?

The LT4363IS-1#TRPBF implements latch-off fault behavior: once the TMR pin reaches 1.375V, GATE and FLT remain low until manually reset via SHDN. In contrast, LT4363IS-2#TRPBF automatically restarts after cool-down (TMR falling to 0.5V), making the -1 variant preferred for safety-critical lockout requirements. Both share identical pinout, package, and temperature grade.

Can LT4363IS-1#TRPBF drive a logic-level N-channel MOSFET directly?

Yes, LT4363IS-1#TRPBF's GATE output uses an internal charge pump to drive up to 13V above the OUT pin, sufficient for most logic-level N-MOSFETs (e.g., V_GS(th) ≤ 2.5V). The 14V internal clamp protects against overdrive, and the pull-down current exceeds 50mA - ensuring fast turn-off even with high gate capacitance.

How is reverse input protection implemented with LT4363IS-1#TRPBF?

LT4363IS-1#TRPBF supports reverse input protection by enabling back-to-back N-MOSFET configurations: one MOSFET sourced from VCC, the other from OUT, with gates driven jointly by GATE. Its VCC and SHDN pins tolerate –60V, allowing the circuit to block reverse current without diode voltage drop or power loss - improving efficiency in battery-powered systems.

What is the minimum TMR capacitor value required for stable operation of LT4363IS-1#TRPBF?

A minimum 10nF capacitor is required on the TMR pin to stabilize the feedback loop and prevent oscillation during regulation. Smaller values risk instability and erratic fault timing; typical designs use 100nF–1µF to achieve millisecond-scale warning and shutdown delays aligned with MOSFET SOA limits.

Does LT4363IS-1#TRPBF require external components for basic overvoltage clamping?

Yes - LT4363IS-1#TRPBF requires three external components for basic operation: a resistive divider (R1/R2) from OUT to GND to set the FB reference voltage (e.g., 27V), a current-sense resistor between SNS and OUT (e.g., 10mΩ), and a TMR capacitor to ground (≥10nF). No external gate resistor is needed due to integrated drive strength.