Analog Devices Inc. LT4363CMS-1#TRPBF

Overview

LT4363CMS-1#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 latch-off fault behavior (LT4363-1 variant) for industrial power rail protection in avionics and hot-swap systems.

For engineers reviewing the LT4363CMS-1#TRPBF datasheet, LT4363CMS-1#TRPBF pinout, LT4363CMS-1#TRPBF application, or LT4363CMS-1#TRPBF equivalent, this page delivers verified specifications, MSOP-12 package layout, UV/OV comparator thresholds, adjustable fault timer, and real-world surge protection design context - all confirmed from Analog Devices' official Rev. C datasheet.

Technical Context

The LT4363CMS-1#TRPBF implements dual-fault protection: overvoltage regulation via FB-servo loop holding 1.275V at feedback pin, and overcurrent limiting by controlling GATE to clamp ΔVSNS to 50mV (25mV if OUT < 2V). Its TMR pin uses VCC–OUT–dependent current sources (4–50µA for OV, 8–260µA for OC) to dynamically scale fault timing per MOSFET SOA.

As the -1 variant, it latches off permanently after fault timeout - requiring SHDN ≤ 0.4V for ≥100µs reset - unlike the auto-retry -2 version. It supports reverse input protection to –60V, shutdown current < 7µA, and operates across 4V–80V VCC with 12-Lead MSOP package (θJA = 135°C/W).

Key Specifications

Pinout & Package

LT4363CMS-1#TRPBF is housed in a 12-lead plastic MSOP package (MS package code), with θJA = 135°C/W. Pin 1 is FB; pins 7 and 12 are GND; pin 11 is UV; pin 6 is SHDN. Exposed pad is not electrically connected but may be grounded for thermal improvement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT4363IMS-1#TRPBF and LT4363HMS-1#TRPBF, the LT4363CMS-1#TRPBF offers identical surge stopper functionality and MSOP-12 layout in a cost-optimized commercial temperature grade - ideal for indoor industrial, test equipment, and non-extreme embedded systems where 0°C–70°C suffices.

Availability

LT4363CMS-1#TRPBF is available at Aetrix Electronics and suitable for avionic power rail protection, industrial hot-swap modules, high-side battery switches, and intrinsic safety barriers requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for LT4363CMS-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.

The LT4363 product line was designed as a family of high-voltage surge stoppers to replace discrete protection circuits in demanding 12V–48V industrial, automotive, and aerospace power systems - emphasizing latch-off safety, MOSFET SOA optimization, and wide-input resilience.

FAQ

What is the key functional difference between LT4363CMS-1#TRPBF and LT4363CMS-2#TRPBF?

The LT4363CMS-1#TRPBF implements latch-off fault behavior: once the TMR pin reaches 1.375V, the GATE pin stays low until manually reset via SHDN ≤ 0.4V for ≥100µs. In contrast, the LT4363CMS-2#TRPBF automatically restarts after cool-down (TMR falling to 0.5V), making the -1 variant preferred for safety-critical or single-shot protection scenarios where unattended retry is unacceptable.

Can LT4363CMS-1#TRPBF drive a MOSFET directly without external level-shifting components?

Yes. The LT4363CMS-1#TRPBF integrates a charge pump that pulls the GATE pin to ~13V above the OUT pin, enabling direct drive of standard N-channel MOSFETs (e.g., FDB33N25) without external level shifters. Its GATE output is internally clamped to 14V, protecting the MOSFET gate oxide during fault conditions.

How does the TMR pin enable MOSFET Safe Operating Area (SOA) compliance in LT4363CMS-1#TRPBF?

The LT4363CMS-1#TRPBF charges the TMR capacitor with a current proportional to VCC–OUT - i.e., the MOSFET's VDS. Higher VDS increases TMR current, shortening fault timing. This dynamic scaling ensures shorter turn-off delays during high-stress, high-VDS faults, keeping power dissipation within the MOSFET's SOA envelope as defined in its datasheet.

What is the minimum recommended TMR capacitor value for stable operation of LT4363CMS-1#TRPBF?

Analog Devices specifies a minimum 10nF capacitor on the TMR pin to ensure loop stability and proper fault timing. Using smaller values risks oscillation in the regulation loop and inaccurate warning/turn-off thresholds. Typical designs use 68nF–1µF ceramic capacitors to achieve multi-millisecond fault windows aligned with ISO 7637-2 or DO-160 transient profiles.

Does LT4363CMS-1#TRPBF support reverse input protection, and how is it implemented?

Yes. The LT4363CMS-1#TRPBF tolerates –60V on VCC, SHDN, UV, and OV pins without damage. Reverse protection is implemented by connecting two N-channel MOSFETs back-to-back between input and output - eliminating Schottky diode forward drop while leveraging the IC's gate drive and fault logic to manage conduction and blocking states safely.