Analog Devices Inc. LTC4364IDE-1#PBF

Overview

LTC4364IDE-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/1ms transients, provides reverse input protection to –40V, and latches off the external N-channel MOSFET pass device upon overvoltage or overcurrent fault timeout. Used in 12V/24V vehicle electronics requiring AEC-Q100-compliant transient resilience.

For engineers reviewing the LTC4364IDE-1#PBF datasheet, LTC4364IDE-1#PBF pinout, LTC4364IDE-1#PBF application, or LTC4364IDE-1#PBF equivalent, key selection criteria include latch-off behavior (vs auto-retry), 4V–80V operating range, 10μA shutdown current, adjustable fault timer via TMR capacitor, and dual-MOSFET gate drive architecture for surge + reverse polarity protection.

Technical Context

The LTC4364IDE-1#PBF implements two independent control loops: a voltage amplifier regulating HGATE to clamp VOUT at 27V using FB feedback, and a current-sense amplifier limiting ∆VSNS to 50mV (or 25mV during output short) to protect the pass MOSFET. Fault detection uses a single TMR capacitor charged by voltage- or current-dependent current sources - 5× higher pull-up current during overcurrent versus overvoltage to accelerate turn-off.

Its latch-off behavior distinguishes it from the LTC4364-2 variant: after HGATE turns off due to fault timeout, LTC4364IDE-1#PBF holds HGATE low until manually reset via SHDN or UV pin. The ideal diode loop actively controls DGATE to maintain ~30mV forward drop across the second MOSFET, minimizing conduction loss while suppressing reverse current transients during input collapse or short.

Key Specifications

Pinout & Package

Package: 14-lead (4mm × 3mm) plastic DFN with optional exposed pad (Pin 15) connected to GND. Thermal resistance θJA = 45°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4364IDE-2#PBF, the LTC4364IDE-1#PBF provides deterministic fault containment via latch-off, critical for safety-critical automotive modules. Versus TPS26631RGER, it delivers full surge suppression (OV+OC), ideal diode functionality, and AEC-Q100 qualification - making it a complete front-end protection solution rather than a current limiter.

Availability

LTC4364IDE-1#PBF is available at Aetrix Electronics and suitable for automotive front-end protection, redundant power ORing, and industrial PLC I/O modules requiring stable component supply with AEC-Q100 compliance and –40°C to +85°C operation.

Supply support for LTC4364IDE-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.

The LTC4364IDE-1#PBF belongs to Analog Devices' Surge Stopper product line, engineered specifically for robust front-end power protection in automotive, avionic, and industrial systems facing severe voltage transients and reverse polarity threats.

FAQ

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

The LTC4364IDE-1#PBF implements latch-off fault behavior: once HGATE turns off due to overvoltage or overcurrent timeout, it remains off until manually reset via SHDN or UV pin. In contrast, LTC4364IDE-2#PBF automatically retries after a cool-down cycle. This makes LTC4364IDE-1#PBF appropriate for safety-critical applications where uncontrolled re-engagement is unacceptable.

How does LTC4364IDE-1#PBF achieve reverse input protection to –40V?

The LTC4364IDE-1#PBF achieves –40V reverse input tolerance through internal level-shifting and clamping circuitry on the VCC, SOURCE, and SHDN pins. When input polarity reverses, the device shuts down both HGATE and DGATE, turning off both external N-MOSFETs and blocking conduction. Its absolute maximum rating for VCC and SOURCE is –40V, verified per AEC-Q100 stress testing.

Can LTC4364IDE-1#PBF regulate output voltage to a value other than 27V?

Yes. The LTC4364IDE-1#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 - for example, 15V, 24V, or 36V - while maintaining accuracy over temperature and line conditions.

What is the purpose of the TMR pin on LTC4364IDE-1#PBF, and how is it configured?

The TMR pin on LTC4364IDE-1#PBF connects to an external capacitor that sets three timing intervals: fault warning (at 1.25V), fault turn-off (at 1.35V), and cool-down (32 cycles between 0.15V and 1.35V). Charging current scales with VCC–VOUT, enabling adaptive timing - shorter timeouts for higher differential voltages to protect MOSFET safe operating area.

Does LTC4364IDE-1#PBF require external components to operate, and what are the minimum required?

Yes. Minimum required external components for LTC4364IDE-1#PBF include: two N-channel MOSFETs (M1 for surge stopper, M2 for ideal diode), FB resistive divider, TMR capacitor, 6.8nF HGATE-to-GND capacitor, and 22µF low-ESR output bypass capacitor. Optional but recommended: 15V Zener from HGATE/SOURCE for >24V supplies and pull-up resistors for FLT/ENOUT open-drain outputs.