Analog Devices Inc. LT4363CS-1#TRPBF

Overview

LT4363CS-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 latches off after fault timeout. It operates from 4V to 80V input, features 1.275V precision FB reference, and delivers robust protection in avionic and industrial power rails.

For engineers reviewing the LT4363CS-1#TRPBF datasheet, LT4363CS-1#TRPBF pinout, LT4363CS-1#TRPBF application, or LT4363CS-1#TRPBF equivalent, this page provides verified specifications, SO package terminal mapping, UV/OV comparator thresholds, fault timer behavior, and real-world surge protection use cases - all confirmed against Analog Devices' Rev. C datasheet and ordering information.

Technical Context

The LT4363CS-1#TRPBF implements dual-fault protection: overvoltage regulation via feedback-controlled GATE drive (FB = 1.275V) and overcurrent limiting via SNS–OUT differential sensing (ΔVSNS = 50mV typical). Its fault timer uses VCC–OUT voltage-dependent current sourcing to dynamically scale timing with MOSFET stress, ensuring safe operation within SOA boundaries.

Unlike the auto-retry LT4363-2 variant, the LT4363CS-1#TRPBF latches off permanently after TMR reaches 1.375V and requires active SHDN reset (≥100µs low pulse). It integrates UV (1.275V threshold) and OV (1.275V, unused in -1 version) comparators, reverse-input tolerance to –60V, and shutdown quiescent current <7µA.

Key Specifications

Pinout & Package

LT4363CS-1#TRPBF is housed in a 16-lead plastic SO package (S package), with exposed thermal pad not present (unlike DFN variants). Pin 1 is bottom-left corner when notch faces up; pin numbering follows standard SO convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT4363CS-2#TRPBF and TPS26631PWPR, the LT4363CS-1#TRPBF uniquely combines latch-off safety, fully adjustable output clamping, and dynamic fault timing - making it optimal for mission-critical systems where uncontrolled restart could compromise integrity.

Availability

LT4363CS-1#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial PLC backplane protection, and intrinsic safety barrier design requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LT4363CS-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 industrial, automotive, communications, and aerospace markets.

The LT4363 product line was designed specifically for high-reliability DC power protection - delivering precise overvoltage regulation, fast overcurrent limiting, and intelligent fault timing in harsh environments.

FAQ

What is the key functional difference between LT4363CS-1#TRPBF and LT4363CS-2#TRPBF?

The LT4363CS-1#TRPBF latches off permanently after fault timeout and requires manual SHDN reset (≥100µs low pulse), whereas the LT4363CS-2#TRPBF automatically restarts after cool-down. Both share identical pinout, electrical specs, and SO package. The LT4363CS-1#TRPBF's OV pin is unused and must be grounded; the LT4363CS-2#TRPBF uses it to inhibit retry during sustained overvoltage.

Can LT4363CS-1#TRPBF be used with a P-channel MOSFET instead of an N-channel MOSFET?

No - the LT4363CS-1#TRPBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver is optimized to source current and clamp relative to the OUT pin (source), not the drain. Using a P-channel device would violate the internal charge pump architecture and render FB regulation and current limiting inoperable.

What is the minimum TMR capacitor value required for stable operation of LT4363CS-1#TRPBF?

A minimum 10nF capacitor is required on the TMR pin to compensate the control loop and ensure stable regulation during overvoltage events. Smaller values risk oscillation or false fault triggering. Typical designs use 1µF–10µF to achieve multi-millisecond fault timing windows aligned with MOSFET SOA requirements.

How does LT4363CS-1#TRPBF handle reverse battery connection?

The LT4363CS-1#TRPBF withstands –60V on VCC, SHDN, UV, and OV pins without damage or latch-up. During reverse polarity, internal protection structures block conduction while preserving functionality upon return to normal polarity - a critical feature for automotive and mobile equipment where battery misconnection occurs.

Is the FB pin of LT4363CS-1#TRPBF required to be connected for basic overvoltage protection?

Yes - the FB pin must be connected to a resistive divider from OUT to GND to set the output clamp voltage. Leaving FB floating disables regulation; connecting FB directly to GND disables the overvoltage clamp entirely, leaving only overcurrent and UV protection active. The 1.275V internal reference is essential for closed-loop voltage control.