Analog Devices Inc. LTC4364CMS-1#PBF

Overview

LTC4364CMS-1#PBF from Analog Devices is a surge stopper with ideal diode controller for automotive and industrial power rail protection. It regulates output voltage to 27V during 92V input surges, provides reverse input protection to –40V, and features latch-off fault response. The device drives two external N-channel MOSFETs - one for overvoltage/overcurrent regulation (HGATE), another for ideal diode operation (DGATE) - enabling robust load protection in 12V/24V vehicle systems.

For engineers reviewing the LTC4364CMS-1#PBF datasheet, LTC4364CMS-1#PBF pinout, LTC4364CMS-1#PBF application, or LTC4364CMS-1#PBF equivalent, key selection criteria include its 4V–80V operating range, 10μA shutdown current, adjustable fault timer via TMR capacitor, latch-off behavior (LTC4364-1 variant), and AEC-Q100 qualification for automotive use.

Technical Context

The LTC4364CMS-1#PBF integrates dual control loops: a voltage amplifier regulating HGATE to clamp VOUT at 27V during overvoltage (via FB feedback), and a current amplifier limiting ∆VSNS to 50mV (or 25mV during output short) to protect the pass MOSFET. Its fault timer uses a single external capacitor to set warning (1.25V), turn-off (1.35V), and cool-down thresholds.

As an LTC4364-1 variant, it latches HGATE off after fault timeout - requiring SHDN or UV pin reset - unlike the auto-retry LTC4364-2. The ideal diode controller maintains ~30mV forward drop across DGATE-driven MOSFET and actively pulls DGATE low during reverse current transients to minimize output disturbance.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic MSOP (MS package), 3mm × 4.9mm footprint, exposed pad optional for thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4364IMS-1#PBF, the LTC4364CMS-1#PBF trades extended temperature and automotive qualification for lower cost and availability in commercial channels; compared with LTC4364CMS-2#PBF, it prioritizes fail-safe shutdown over autonomous recovery - critical for safety-aware designs.

Availability

LTC4364CMS-1#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial redundant power ORing, and hot-swap port protection requiring stable component supply across production lifecycles.

Supply support for LTC4364CMS-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets since 1965.

The LTC4364 product line delivers integrated surge suppression and ideal diode control for 4V–80V power rails, targeting automotive electronics, industrial PLCs, and telecom infrastructure where reliability under voltage transients is mission-critical.

FAQ

What is the key functional difference between LTC4364CMS-1#PBF and LTC4364CMS-2#PBF?

The LTC4364CMS-1#PBF implements latch-off fault behavior: after overvoltage or overcurrent timeout, HGATE remains off until manually reset via SHDN or UV pin. In contrast, LTC4364CMS-2#PBF automatically retries after a cool-down cycle. This makes LTC4364CMS-1#PBF appropriate for safety-critical applications where uncontrolled restart could be hazardous, while LTC4364CMS-2#PBF suits systems needing autonomous recovery from transient faults.

Can LTC4364CMS-1#PBF be used in automotive under-hood applications?

No - LTC4364CMS-1#PBF is rated for 0°C to 70°C ambient and is not AEC-Q100 qualified. For under-hood use, select automotive-grade variants like LTC4364IMS-1#WPBF (–40°C to 85°C, AEC-Q100) or LTC4364HMS-1#WPBF (–40°C to 125°C, AEC-Q100). These share identical functionality and pinout but undergo additional stress testing and process controls required for automotive deployment.

How is the output clamp voltage set for LTC4364CMS-1#PBF?

The output clamp voltage is set by an external resistive divider from OUT to GND, connected to the FB pin. With a 1.25V internal reference, a 27V clamp requires R1 = 4.99kΩ and R2 = 10kΩ (as shown in Figure 1 of the datasheet). The divider ratio determines regulation point: VCLAMP = 1.25V × (1 + R1/R2). Precision resistors (<1%) are recommended to maintain tight tolerance across temperature.

What MOSFET parameters are critical when selecting the HGATE-driven pass device for LTC4364CMS-1#PBF?

Key MOSFET parameters include RDS(ON) < 10mΩ at VGS = 10V (to minimize conduction loss), SOA rating sufficient for worst-case VDS × ID during 100ms load dump, and gate charge Qg < 50nC (for fast turn-on/off controlled by HGATE's ±130mA drive). FDB33N25 is a validated choice: 5.5mΩ RDS(ON), 33A ID, and 38nC Qg - ensuring low heat rise and reliable transient handling in 12V systems using LTC4364CMS-1#PBF.

Does LTC4364CMS-1#PBF require external components beyond the MOSFETs and feedback divider?

Yes - essential external components include: (1) 6.8nF capacitor from HGATE to GND for stability; (2) 0.22µF capacitor from OUT to GND for sensing; (3) 22µF low-ESR electrolytic at VOUT for holdup; (4) TMR capacitor (e.g., 6.8µF) for fault timing; and (5) 15V Zener from DGATE/SOURCE for >24V supplies. These are specified in the datasheet's Typical Application and Layout Guidelines sections for LTC4364CMS-1#PBF.