Analog Devices Inc. LT4363IMS-1#TRPBF

Overview

LT4363IMS-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 provides latch-off fault response with 1.275V TMR fault threshold. It operates from 4V to 80V input, supports –60V reverse input protection, and targets industrial hot-swap and avionic power rail protection.

For engineers reviewing the LT4363IMS-1#TRPBF datasheet, LT4363IMS-1#TRPBF pinout, LT4363IMS-1#TRPBF application, or LT4363IMS-1#TRPBF equivalent, this page delivers verified functional identity, MSOP-12 package mapping, confirmed 12-pin terminal roles, real-world timing behavior (e.g., <1µs overcurrent turn-off), and two validated alternative parts for surge protection design trade-offs.

Technical Context

The LT4363IMS-1#TRPBF implements dual-loop protection: a voltage amplifier regulates GATE to hold FB at 1.275V during overvoltage, while a current amplifier maintains ΔVSNS = 50mV (or 25mV if OUT < 2V) during overcurrent. Fault timing is dynamically scaled by VCC–OUT voltage to match MOSFET safe operating area constraints.

It features independent UV/OV comparators (1.275V thresholds, 12mV/7.5mV hysteresis), a shutdown pin tolerant to –60V to 100V, and open-collector FLT/ENOUT outputs capable of sinking 2mA. The LT4363-1 variant latches off after fault timeout and requires active SHDN reset.

Key Specifications

Pinout & Package

LT4363IMS-1#TRPBF is housed in a 12-lead plastic MSOP package (4.0mm × 3.0mm footprint) with GND-connected exposed pad (optional). Pin functions are electrically and thermally optimized for high-reliability industrial and avionic surge protection layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT4363IMS-1#TRPBF, the LT4363CMS-1#TRPBF offers lower thermal resistance for higher continuous current handling in compact layouts, while the LT4363HMS-1#TRPBF extends operational reliability to +125°C ambient - both retain identical electrical behavior and fault timing characteristics.

Availability

LT4363IMS-1#TRPBF is available at Aetrix Electronics and suitable for avionic power bus protection, industrial hot-swap modules, intrinsic safety barriers, and battery-powered system protection requiring stable component supply and long-term lifecycle assurance.

Supply support for LT4363IMS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, aerospace, and communications markets.

The LT4363 product line was designed specifically for high-reliability DC power rail protection - delivering integrated surge suppression, current limiting, and fault management in a single IC to replace multi-component discrete solutions.

FAQ

What is the key functional difference between LT4363IMS-1#TRPBF and LT4363IMS-2#TRPBF?

The LT4363IMS-1#TRPBF implements latch-off fault behavior: once the TMR pin reaches 1.375V, the GATE pin stays low until manually reset via SHDN. In contrast, LT4363IMS-2#TRPBF automatically restarts after TMR discharges to 0.5V during cool-down. This makes the -1 version suitable for safety-critical applications requiring explicit operator intervention after fault.

Can LT4363IMS-1#TRPBF drive a logic-level N-channel MOSFET directly?

Yes, LT4363IMS-1#TRPBF drives the gate with a charge pump that delivers up to 13V above the OUT pin, sufficient for most logic-level N-MOSFETs (e.g., VGS(th) ≤ 2.5V). Its GATE output can sink up to 1000µA during turn-off and source limited current during turn-on - verify MOSFET Qg and switching speed requirements against the 14V internal clamp and dynamic drive capability.

How does the TMR capacitor value affect fault timing in LT4363IMS-1#TRPBF?

The TMR capacitor sets three timing intervals: early warning duration (TMR = 1.275V), total fault timeout (TMR = 1.375V), and cool-down period (TMR = 4.3V → 0.5V). For example, a 6.8µF capacitor yields ~100ms warning and ~120ms total regulation time under 80V input surge - exact values scale linearly with capacitance and inversely with TMR charging current, which itself depends on VCC–OUT.

Is the OV pin used in LT4363IMS-1#TRPBF?

No - the OV pin is exclusive to LT4363-2 variants. In LT4363IMS-1#TRPBF, the OV pin is not internally connected and must be left floating or tied to GND per datasheet guidance. Using it as an input would have no effect on device operation.

What is the maximum reverse input voltage LT4363IMS-1#TRPBF can withstand?

LT4363IMS-1#TRPBF withstands –60V applied to the VCC pin and –60V applied to the SHDN pin without damage, enabling robust reverse-battery and reverse-polarity protection when paired with back-to-back N-MOSFETs - a key advantage over Schottky diode-based solutions.