Analog Devices Inc. LTC4368HMS-1#TRPBF

Overview

LTC4368HMS-1#TRPBF from Analog Devices is a high-voltage bidirectional circuit breaker controller that protects loads from −40V to 100V input faults, provides ±50mV forward/reverse current sensing, and controls back-to-back N-channel MOSFETs in automotive surge protection systems. It features 32ms turn-on delay for AC blocking, AEC-Q100 qualification (−40°C to 125°C), and 80µA operating current.

For engineers reviewing the LTC4368HMS-1#TRPBF datasheet, LTC4368HMS-1#TRPBF pinout, LTC4368HMS-1#TRPBF application, or LTC4368HMS-1#TRPBF equivalent, key selection criteria include reverse overcurrent threshold (−50mV), UV/OV adjustability via resistive dividers, latch-off vs auto-retry configuration via RETRY pin, and MSOP-10 package compatibility with hot-swap and energy storage system designs.

Technical Context

The LTC4368HMS-1#TRPBF implements dual fast comparators (1µs propagation) for UV and OV detection with 25mV hysteresis, each driving a 60mA GATE pull-down sink. Its bidirectional current sense architecture uses separate forward (+50mV) and reverse (−50mV) thresholds referenced to SENSE–VOUT, enabling independent fault response in both power flow directions.

It integrates a charge pump delivering up to 13.1V gate enhancement above VOUT, supports 32ms recovery delay after UV/OV faults, and includes automatic reverse re-enable logic requiring VIN–VOUT ≥ 100mV before reconnecting. The SHDN-controlled low-power mode draws only 5µA, and internal logic enforces strict sequencing between fault detection, GATE discharge, and FAULT assertion.

Key Specifications

Pinout & Package

10-Lead Plastic MSOP package (LTGTG marking), exposed pad optional for thermal relief or grounding. Pinout validated per Analog Devices Rev. C datasheet Figure 1 (MS10 TOP VIEW).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4368HMS-1#TRPBF, the LTC4368HDD-1#TRPBF offers identical protection features in a thermally superior DFN package, while the TPS26631RHFT provides simplified forward-only protection without reverse fault coverage - making it unsuitable for battery-backed or bidirectional energy systems.

Availability

LTC4368HMS-1#TRPBF is available at Aetrix Electronics and suitable for automotive load protection, industrial energy storage interface, portable instrumentation power path, and hot-swappable industrial I/O module applications requiring stable component supply across extended temperature ranges.

Supply support for LTC4368HMS-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, and automotive markets.

The LTC4368 product line delivers robust, integrated overvoltage, undervoltage, and bidirectional overcurrent protection for demanding automotive and industrial power systems - designed specifically for AEC-Q100 compliance and high-reliability fault containment.

FAQ

What is the reverse overcurrent threshold for LTC4368HMS-1#TRPBF?

The LTC4368HMS-1#TRPBF has a fixed reverse overcurrent threshold of −50mV (SENSE–VOUT), as specified for the "-1" variant in the datasheet. This enables reliable detection of reverse current flow during battery reversal or regenerative braking events. The threshold is internally trimmed and applies across the full −40°C to +125°C operating range without external calibration. No resistor or configuration is needed to activate this function - it is inherent to the LTC4368HMS-1#TRPBF silicon design.

Does LTC4368HMS-1#TRPBF support hot-swap insertion of the input supply?

Yes, LTC4368HMS-1#TRPBF supports hot-swap insertion: its VIN pin tolerates −40V to 100V, includes a 2.2V UVLO for safe startup sequencing, and incorporates a 32ms turn-on delay that debounces live connections and blocks 50Hz/60Hz AC. During hot insertion, the device remains in high-impedance state until VIN exceeds UVLO and passes UV/OV validation. This prevents inrush-induced false trips and ensures clean power engagement - confirmed in Typical Application Figure TA01a using 24V input with 10A breaker.

How does the RETRY pin configure fault recovery behavior in LTC4368HMS-1#TRPBF?

The RETRY pin on LTC4368HMS-1#TRPBF selects forward overcurrent recovery mode: grounding RETRY configures latch-off (requires SHDN toggle to restore power), while connecting a capacitor configures auto-retry with 5.5ms/nF cooldown delay. For example, a 22nF capacitor yields ~120ms delay before automatic reconnection. This behavior is exclusive to forward faults; reverse faults automatically recover when VIN–VOUT ≥ 100mV. The RETRY function is validated in Electrical Characteristics Table (t_RETRY) and Figure F02.

What package and temperature grade does LTC4368HMS-1#TRPBF use?

LTC4368HMS-1#TRPBF uses a 10-Lead Plastic MSOP package marked LTGTG and is rated for −40°C to +125°C operation, meeting AEC-Q100 Grade H requirements. This makes it suitable for under-hood automotive applications and harsh industrial environments. The MSOP package offers standardized assembly compatibility and is distinct from the DFN variants (e.g., LTC4368HDD-1#TRPBF), which share electrical specs but differ in thermal performance (θ_JA = 43°C/W vs 160°C/W) and footprint.

Can LTC4368HMS-1#TRPBF protect against AC line transients?

Yes, LTC4368HMS-1#TRPBF blocks 50Hz and 60Hz AC power via its 32ms turn-on delay - a feature explicitly documented in the FEATURES and OPERATION sections. When an AC waveform is applied to VIN, the device's internal timing prevents GATE activation long enough to reject full AC cycles. This eliminates need for external rectifiers in dual-supply systems and is verified in Typical Application TA01b and Figure G17 (AC Blocking). The −40V to 100V absolute rating further ensures survival during AC-coupled surges.