Analog Devices Inc. LTC4364CS-1#PBF

Overview

LTC4364CS-1#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 at adjustable clamp voltage (e.g., 27V), provides reverse input protection to –40V, and drives dual N-channel MOSFETs for overvoltage/overcurrent fault management and ideal diode holdup during input brownouts or shorts.

For engineers reviewing the LTC4364CS-1#PBF datasheet, LTC4364CS-1#PBF pinout, LTC4364CS-1#PBF application, or LTC4364CS-1#PBF equivalent, key selection criteria include latch-off fault behavior (LTC4364-1 variant), 4V–80V operating range, 10μA shutdown current, AEC-Q100 qualification, and SO-16 package compatibility with legacy board layouts.

Technical Context

The LTC4364CS-1#PBF implements dual-loop control: a voltage amplifier regulates HGATE to clamp VOUT via FB feedback during overvoltage, while a current amplifier limits ∆VSNS to 50mV (or 25mV during output short) by modulating HGATE. Fault timing is governed by TMR capacitor charging-faster under overcurrent due to 5× higher pull-up current-reaching 1.25V for FLT warning and 1.35V for HGATE turn-off.

Its ideal diode function uses DGATE to maintain ~30mV forward drop across M2, minimizing conduction loss and enabling fast reverse-current shutdown (<1.5μs). UV and OV comparators independently disable HGATE/DGATE when input falls below 1.25V or rises above 1.25V, with UV reset threshold of 0.6V specific to the -1 variant for manual recovery.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic SO (Small Outline), JEDEC MS-012AC, 10.3mm × 7.5mm body, 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4364CS-1#PBF, LTC4365CS-1#PBF extends input voltage range and adds robust gate clamping, while TPS26631PWPR trades flexibility for integration and lower BOM count - neither offers identical latch-off + ideal diode + reverse protection in one SO-16 solution.

Availability

LTC4364CS-1#PBF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial redundant power ORing, and avionics power sequencing requiring stable component supply across extended temperature and high-reliability environments.

Supply support for LTC4364CS-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The LTC4364CS-1#PBF belongs to Analog Devices' Surge Stopper family, engineered specifically for robust front-end power protection in harsh electrical environments where load dump, reverse polarity, and brownout resilience are mandatory.

FAQ

What is the key functional difference between LTC4364CS-1#PBF and LTC4364CS-2#PBF?

The LTC4364CS-1#PBF implements latch-off fault behavior: once the TMR capacitor reaches 1.35V, HGATE turns off permanently until manually reset via SHDN or UV pin. In contrast, LTC4364CS-2#PBF automatically retries after a 32-cycle cool-down timer completes, provided the OV pin voltage has fallen below threshold. This makes the -1 variant suitable for safety-critical systems requiring guaranteed fault isolation.

Can LTC4364CS-1#PBF operate with a 24V input supply and still protect against load dump?

Yes. The LTC4364CS-1#PBF operates from 4V to 80V and withstands 200V/1ms transients. With a 24V nominal input, it regulates output to a user-defined clamp voltage (e.g., 27V) using the FB divider during load dump events. Its wide input range ensures reliable cold-cranking operation down to 4V, and its –40V reverse input rating protects against battery reversal.

How does the ideal diode function of LTC4364CS-1#PBF improve system efficiency compared to a discrete Schottky diode?

The LTC4364CS-1#PBF drives an external N-channel MOSFET to maintain ~30mV forward voltage drop, versus 0.3V–0.5V for Schottky diodes. At 5A load, this reduces conduction loss from ~1.5W to ~0.15W - a 90% reduction. It also eliminates reverse leakage and enables fast (<1.5μs) turn-off during input collapse, preserving output holdup time without diode recovery delay.

What is the purpose of the TMR pin on LTC4364CS-1#PBF, and how is timing set?

The TMR pin on LTC4364CS-1#PBF interfaces with an external capacitor to define three critical timing intervals: fault warning (at 1.25V), HGATE turn-off (at 1.35V), and cool-down/retry cycle (32 cycles between 0.15V and 1.35V). Charging current scales with V_CC–V_OUT, ensuring shorter timeouts during high-voltage faults to protect the MOSFET's safe operating area.

Is LTC4364CS-1#PBF qualified for automotive applications, and what does that entail?

Yes. LTC4364CS-1#PBF is AEC-Q100 qualified for automotive use, meaning it has undergone rigorous stress testing including temperature cycling, humidity bias HAST, ESD, and mechanical shock/vibration per automotive reliability standards. This qualification validates its suitability for deployment in engine control units, body electronics, and ADAS modules where long-term field reliability is non-negotiable.