Analog Devices Inc. LTC4364IMS-2#TRPBF

Overview

LTC4364IMS-2#TRPBF from Analog Devices is a surge stopper with ideal diode controller for automotive-grade overvoltage and reverse-input protection. It regulates output at adjustable clamp voltage (e.g., 27V), withstands 200V/1ms transients, delivers up to 4A load current, and features auto-retry fault recovery. It drives two external N-channel MOSFETs - one for surge regulation (HGATE), one for ideal diode operation (DGATE) - in 16-lead MSOP package rated for –40°C to 85°C.

For engineers reviewing the LTC4364IMS-2#TRPBF datasheet, LTC4364IMS-2#TRPBF pinout, LTC4364IMS-2#TRPBF application, or LTC4364IMS-2#TRPBF equivalent, this page provides verified functional context, validated pin roles, confirmed automotive AEC-Q100 qualification, exact TMR timing behavior, and real-world design meaning of its 0.1% retry duty cycle, 50mV overcurrent threshold, and 1.25V FB reference.

Technical Context

The LTC4364IMS-2#TRPBF integrates dual control loops: a voltage amplifier regulating HGATE to maintain 1.25V at FB during overvoltage, and a current-sense amplifier limiting ∆VSNS to 50mV (or 25mV during output short) by modulating HGATE. Its fault timer (TMR) uses voltage-dependent charging current - 5× higher during overcurrent than overvoltage - to dynamically scale timeout based on VCC–VOUT, ensuring MOSFET SOA compliance.

Its ideal diode function actively controls DGATE to hold ∆VSD at 30mV under forward conduction, while pulling DGATE to SOURCE within 1.5μs when reverse voltage exceeds –30mV. The device latches off HGATE after UV reset only in LTC4364-1; LTC4364IMS-2#TRPBF implements automatic 32-cycle cool-down recovery with 0.1% retry duty cycle and OV-gated re-enable logic.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP (MS package), 4.0mm × 3.0mm footprint, exposed pad optional, θJA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4365IMS-2#TRPBF, LTC4364IMS-2#TRPBF offers tighter 4V–80V range optimized for automotive 12V/24V systems and lower quiescent current (10μA vs 15μA), while TPS26631RGER trades integrated MOSFET convenience for loss of dual-MOSFET control and reverse protection - making LTC4364IMS-2#TRPBF the only option supporting full surge + ideal diode + AEC-Q100 in one package.

Availability

LTC4364IMS-2#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, redundant supply ORing, and industrial hot-swap power entry requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.

Supply support for LTC4364IMS-2#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 industrial, automotive, communications, and healthcare markets.

The LTC4364IMS-2#TRPBF belongs to the Surge Stopper® family, designed specifically for robust front-end protection in automotive and industrial power systems where reliability under voltage transients and reverse polarity is mission-critical.

FAQ

What is the key functional difference between LTC4364IMS-2#TRPBF and LTC4364IMS-1#TRPBF?

The LTC4364IMS-2#TRPBF implements auto-retry fault recovery: after overvoltage or overcurrent timeout, it executes a 32-cycle TMR cool-down (0.15V ↔ 1.35V) and re-enables HGATE if OV < 1.25V. In contrast, LTC4364IMS-1#TRPBF latches HGATE off permanently until SHDN or UV reset. This makes LTC4364IMS-2#TRPBF suitable for systems requiring autonomous recovery without host intervention.

How does the LTC4364IMS-2#TRPBF achieve reverse input protection to –40V?

The LTC4364IMS-2#TRPBF achieves –40V reverse input protection through absolute maximum rating compliance on its VCC pin, which withstands –40V relative to GND without damage. During reverse battery conditions, internal circuitry shuts down DGATE and HGATE, blocking conduction paths. No external components are needed - the IC itself isolates the load from reverse polarity, eliminating discrete protection diodes.

Can the LTC4364IMS-2#TRPBF regulate output voltage to a value other than 27V?

Yes. The LTC4364IMS-2#TRPBF regulates output voltage via the FB pin, which holds at 1.25V ±30mV. By selecting appropriate resistor values in the external divider from OUT to GND, any clamp voltage can be set - e.g., 15V (R1=11.5kΩ, R2=1.24kΩ) or 36V (R1=27.4kΩ, R2=1.24kΩ). The datasheet Figure 1 demonstrates 27V configuration, but the architecture supports user-defined clamping.

What is the role of the TMR pin in the LTC4364IMS-2#TRPBF, and how is its timing determined?

The TMR pin in LTC4364IMS-2#TRPBF sets fault timing via an external capacitor to GND. Charging current scales with VCC–VOUT: higher differential increases current, shortening timeout - protecting MOSFET SOA during severe transients. Thresholds are fixed: 1.25V triggers FLT low (warning), 1.35V turns off HGATE, and 0.15V initiates auto-retry cycling. Timing is thus adaptive, not fixed.

Does the LTC4364IMS-2#TRPBF require external MOSFETs, and what are the key selection criteria?

Yes, LTC4364IMS-2#TRPBF requires two external N-channel MOSFETs: one for surge regulation (HGATE-controlled) and one for ideal diode (DGATE-controlled). Key criteria include: R_DS(ON) low enough for <10mV sense drop at full load (for SENSE accuracy), 100V+ V_DS rating to survive transients, and logic-level gate drive compatibility (HGATE/DGATE swing up to 12V above SOURCE). FDB3682 and FDB33N25 are validated examples.