Analog Devices Inc. LTC4364IDE-2#PBF

Overview

LTC4364IDE-2#PBF from Analog Devices is a surge stopper with ideal diode controller designed for automotive and industrial high-reliability power rails. It protects downstream loads from 200V/1ms transients, regulates output to 27V during overvoltage events (e.g., load dump), provides reverse input protection to –40V, features auto-retry fault recovery, and operates across 4V–80V input range.

For engineers reviewing the LTC4364IDE-2#PBF datasheet, LTC4364IDE-2#PBF pinout, LTC4364IDE-2#PBF application, or LTC4364IDE-2#PBF equivalent, key selection criteria include its –40°C to 85°C temperature grade, 0.1% retry duty cycle during overvoltage faults, integrated dual-MOSFET gate drive (HGATE/DGATE), adjustable fault timer, and AEC-Q100 qualification for automotive use.

Technical Context

The LTC4364IDE-2#PBF implements dual-loop protection: a voltage amplifier regulates HGATE to clamp VOUT via external N-channel MOSFET M1 during overvoltage, while a current amplifier limits ∆VSNS to 50mV (or 25mV during output short) to control M1 during overcurrent. Its TMR pin integrates programmable timing with 32-cycle cool-down recovery.

It embeds an ideal diode controller driving DGATE to maintain ~30mV forward drop across M2, enabling reverse input protection and output holdup during brownout or input short. Fault detection triggers FLT low at 1.25V on TMR and disables HGATE at 1.35V; LTC4364-2 variant automatically restarts after cool-down if OV < 1.25V.

Key Specifications

Pinout & Package

Package: 14-lead (4mm × 3mm) plastic DFN with exposed pad (optional GND connection). Pin count and layout match DE package drawing in Rev. B datasheet.

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, the LTC4364IDE-2#PBF offers superior thermal performance in compact layouts; compared with TPS26632RGER, it delivers full dual-MOSFET control, automotive-grade reliability, and field-programmable fault behavior - essential for mission-critical power integrity.

Availability

LTC4364IDE-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, redundant supply ORing, and industrial hot-swap port applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4364IDE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The LTC4364IDE-2#PBF belongs to Analog Devices' Surge Stopper® family, engineered specifically for robust front-end power protection in vehicles, avionics, and industrial equipment exposed to severe voltage transients and polarity reversals.

FAQ

What is the key functional difference between LTC4364IDE-2#PBF and LTC4364IDE-1#PBF?

The LTC4364IDE-2#PBF implements auto-retry fault recovery: after overvoltage or overcurrent timeout, it executes a 32-cycle TMR cool-down sequence and re-enables HGATE if OV < 1.25V. In contrast, the LTC4364IDE-1#PBF latches HGATE off permanently until SHDN or UV is cycled. This makes LTC4364IDE-2#PBF suitable for systems requiring autonomous recovery from intermittent transients without host intervention.

How does LTC4364IDE-2#PBF achieve reverse input protection to –40V?

The LTC4364IDE-2#PBF achieves –40V reverse input protection by internally clamping VCC and SOURCE pins to withstand –40V relative to GND. During reverse polarity, DGATE and HGATE are actively pulled to the SOURCE pin voltage, turning off both external N-MOSFETs and blocking conduction. No external components are required beyond the MOSFETs themselves - the IC's internal architecture ensures bidirectional fault isolation.

Can LTC4364IDE-2#PBF regulate output voltage to a value other than 27V?

Yes. The LTC4364IDE-2#PBF regulates output voltage via the FB pin, which references an internal 1.25V bandgap. By selecting appropriate resistor values in the FB divider network (connected between OUT and GND), users can set any output clamp voltage - e.g., 15V, 24V, or 36V - with precision determined by resistor tolerance and temperature drift. The 27V value shown in typical applications is design-specific, not fixed.

What is the role of the TMR pin in LTC4364IDE-2#PBF fault timing?

The TMR pin in LTC4364IDE-2#PBF serves as the timing node for all fault events. An external capacitor to GND sets three thresholds: 1.25V triggers FLT low (warning), 1.35V turns off HGATE (fault shutdown), and 0.15V initiates the 32-cycle cool-down recovery. Current charging TMR scales with VCC–VOUT, ensuring shorter timeouts during high-dissipation conditions - directly enforcing MOSFET safe operating area (SOA) compliance.

Is LTC4364IDE-2#PBF compatible with standard 12V and 24V automotive systems?

Yes. The LTC4364IDE-2#PBF operates across 4V–80V input, covering cold-crank (as low as 3.5V) and load dump (up to 90V+ transient) conditions in 12V and 24V automotive systems. Its –40°C to +85°C temperature grade, AEC-Q100 qualification, and ability to withstand 200V/1ms transients make it fully compliant with ISO 7637-2 and ISO 16750-2 requirements for automotive front-end protection.