Analog Devices Inc. LTC4364IMS-2#PBF

Overview

LTC4364IMS-2#PBF 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, provides 0.1% retry duty cycle during faults, and drives dual N-channel MOSFETs for surge limiting and reverse-polarity holdup in 12V–48V systems.

For engineers reviewing the LTC4364IMS-2#PBF datasheet, LTC4364IMS-2#PBF pinout, LTC4364IMS-2#PBF application, or LTC4364IMS-2#PBF equivalent, key selection criteria include fault timer programmability, AEC-Q100 qualification, ±40V reverse input tolerance, ideal diode forward voltage regulation (30mV), and MSOP-16 package compatibility with high-voltage PCB layout constraints.

Technical Context

The LTC4364IMS-2#PBF integrates two independent gate drivers: HGATE controls an external N-MOSFET for overvoltage-regulated pass-through (clamping via FB feedback loop), while DGATE manages a second N-MOSFET as an active ideal diode with 30mV forward voltage regulation and fast reverse-current shutdown. Its fault timer (TMR pin) uses voltage-dependent current sources-5× higher during overcurrent-to dynamically scale timeout based on V_CC–V_OUT, preserving MOSFET SOA.

It features dual comparators (OV/UV pins) with 1.25V thresholds and hysteresis, latch-free auto-retry (LTC4364-2 variant), 10μA shutdown current, and robust absolute ratings: V_CC = –40V to 100V, reverse input = –40V, reverse output = –20V. All logic is referenced to SOURCE, enabling true high-side operation without level shifters.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed pad optional, θ_JA = 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 LTC4364IMS-2#PBF, LTC4366IMS-2#PBF extends input range and integrates sensing but increases complexity, while TPS26631PWPR offers simpler OVP-only protection at lower voltage grades-neither matches the full dual-function, AEC-Q100-qualified capability of the LTC4364IMS-2#PBF.

Availability

LTC4364IMS-2#PBF is available at Aetrix Electronics and suitable for automotive ECU protection, redundant power ORing, and industrial 48V DC distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4364IMS-2#PBF 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 (now part of Analog Devices, Inc., a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors).

The LTC4364IMS-2#PBF belongs to the Surge Stopper family, designed specifically for automotive and industrial power systems needing robust overvoltage regulation, reverse-input survival, and ideal diode functionality in a single IC.

FAQ

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

The LTC4364IMS-2#PBF implements auto-retry fault recovery: after overvoltage or overcurrent timeout, it cycles the TMR pin 32 times between 0.15V and 1.35V before re-enabling HGATE, provided the OV pin is below threshold. In contrast, the LTC4364IMS-1#PBF latches HGATE off permanently until SHDN or UV is actively pulsed. This makes LTC4364IMS-2#PBF suitable for systems requiring autonomous recovery without host intervention.

Can LTC4364IMS-2#PBF operate with a 3.3V input supply?

No. The LTC4364IMS-2#PBF has a minimum operating supply voltage of 4V, as specified in its absolute maximum ratings and electrical characteristics. At 3.3V, internal charge pumps cannot generate sufficient gate drive voltage (HGATE/DGATE require ≥5V headroom above SOURCE), and UV detection will force shutdown. It is not rated for sub-4V operation, including 3.3V logic rails.

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

The LTC4364IMS-2#PBF achieves –40V reverse input protection through ruggedized input structures on the VCC pin and internal clamping that prevents junction breakdown. When VCC is pulled below GND, internal protection circuits isolate sensitive analog blocks while allowing SOURCE and gate drivers to track the negative rail-turning off both external MOSFETs and blocking reverse current flow without damage, as verified in AEC-Q100 stress testing.

What external components are mandatory for basic LTC4364IMS-2#PBF operation?

Four external components are mandatory: (1) A capacitor ≥6.8nF from HGATE to GND for stability; (2) A timing capacitor from TMR to GND to set fault timeout; (3) A resistive divider from OUT to GND connected to FB to set clamp voltage; (4) Two N-channel MOSFETs-one for HGATE (pass device) and one for DGATE (ideal diode). No bootstrap capacitors or external op-amps are required.

Is LTC4364IMS-2#PBF pin-compatible with other packages in the LTC4364 family?

Yes-LTC4364IMS-2#PBF (MSOP-16) shares identical pinout and function mapping with LTC4364CS-2#PBF (SO-16) and LTC4364CDE-2#PBF (DFN-14), except for NC pins (Pins 3 and 7 in MSOP/SO, absent in DFN). Signal pins (OUT through FB) retain consistent numbering and roles across all packages, enabling direct PCB footprint interchange where package size allows.