Analog Devices Inc. LTC4367IMS8-1#TRPBF

Overview

LTC4367IMS8-1#TRPBF from Analog Devices is a high-reliability overvoltage, undervoltage, and reverse supply protection controller for 2.5V–60V input systems. It controls back-to-back N-channel MOSFETs to block faults up to +100V and –40V, features 500µs fast fault recovery, 70µA operating current, and operates in –40°C to +85°C industrial temperature range. It is used in automotive load-dump protection circuits where rapid reconnection after transient overvoltage is critical.

For engineers reviewing the LTC4367IMS8-1#TRPBF datasheet, LTC4367IMS8-1#TRPBF pinout, LTC4367IMS8-1#TRPBF application, or LTC4367IMS8-1#TRPBF equivalent, key selection criteria include its 500µs GATE turn-on delay (vs. 32ms in standard LTC4367), adjustable UV/OV thresholds via external resistive dividers, gate drive referenced to VOUT, and compatibility with dual N-channel MOSFETs such as Si7942 for low R_DS(ON) and high-voltage blocking.

Technical Context

The LTC4367IMS8-1#TRPBF integrates two precision comparators (0.5V threshold, 25mV hysteresis) for user-configurable UV and OV monitoring, a charge pump-based gate driver delivering up to 13.1V enhancement above VOUT, and a reverse-voltage detection circuit that actively clamps GATE to VIN during negative transients. Its internal logic enforces a fixed 500µs delay before re-enabling the external MOSFETs after fault clearance.

It uses an open-drain FAULT output asserted low on UV/OV violation, SHDN assertion, or VIN < VIN(UVLO); a dedicated SHDN pin enables controlled MOSFET turn-off with slow gate discharge (90µA sink) and GATE tracking of VOUT decay; and all comparator inputs exhibit ≤10nA leakage at 100°C, enabling high-impedance resistor networks for threshold setting.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic MSOP (MS8), 3mm × 3mm footprint, exposed pad (optional ground connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4367IMS8#TRPBF, the LTC4367IMS8-1#TRPBF delivers 64× faster fault recovery-critical for real-time systems-while retaining identical thermal, packaging, and environmental specs. Versus TPS26631PWPR, it offers superior flexibility in voltage window definition and reverse polarity blocking, albeit requiring external MOSFETs.

Availability

LTC4367IMS8-1#TRPBF is available at Aetrix Electronics and suitable for automotive surge protection, industrial power sequencing, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4367IMS8-1#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 healthcare markets.

The LTC4367 family is designed specifically for robust input supply fault protection in harsh environments-delivering precise, programmable overvoltage/undervoltage windows and reverse polarity blocking without external protection components.

FAQ

What is the GATE turn-on delay specification for LTC4367IMS8-1#TRPBF?

The LTC4367IMS8-1#TRPBF has a guaranteed GATE turn-on delay of 500µs maximum after UV/OV fault clearance. This is a key differentiator from the standard LTC4367 (32ms delay) and enables rapid system recovery in time-critical applications like network equipment power entry. The delay is internally fixed and does not require external components.

Can LTC4367IMS8-1#TRPBF protect against reverse battery connection?

Yes, the LTC4367IMS8-1#TRPBF provides active reverse supply protection down to –40V. When VIN goes negative, its internal circuit connects the GATE pin directly to VIN, forcing both external back-to-back N-channel MOSFETs into cutoff. This blocks reverse current flow through body diodes and protects downstream loads without requiring P-channel MOSFETs or Schottky diodes.

What external MOSFETs are recommended for use with LTC4367IMS8-1#TRPBF in a 24V automotive system?

For 24V automotive applications, the Si7942 dual N-channel MOSFET (100V V_DS, 49mΩ R_DS(ON)) is explicitly validated in Analog Devices' application notes for LTC4367IMS8-1#TRPBF. Its 4V gate threshold ensures full enhancement across the 2.5V–60V operating range, and its dual configuration simplifies layout for back-to-back implementation.

How does the SHDN pin function on LTC4367IMS8-1#TRPBF?

The SHDN pin on LTC4367IMS8-1#TRPBF is an active-low control input. When pulled low, it asserts the FAULT output, disables the gate charge pump, and initiates controlled GATE discharge via a 90µA current sink. This ensures smooth MOSFET turn-off with limited dI/dt, preventing voltage spikes. In shutdown, total supply current drops to ≤5µA.

Is LTC4367IMS8-1#TRPBF compatible with the same PCB layout as LTC4367IMS8#TRPBF?

Yes, LTC4367IMS8-1#TRPBF is pin-compatible and footprint-compatible with LTC4367IMS8#TRPBF. Both use the identical 8-lead MSOP package (MS8), share identical pin functions and electrical ratings, and differ only in internal timing-making them direct drop-in replacements where faster fault recovery is needed.