Analog Devices Inc. LTC4364HS-1#PBF

Overview

LTC4364HS-1#PBF from Analog Devices is a high-voltage surge stopper with integrated ideal diode controller for automotive-grade overvoltage and reverse-input protection. It regulates output at 27V during 92V/1ms transients, latches off on fault (LTC4364-1 variant), supports 4V–80V input, withstands –40V reverse input, and drives external N-channel MOSFETs for both surge limiting and bidirectional blocking. Used in automotive power distribution units to maintain ECU operation during load dump.

For engineers reviewing the LTC4364HS-1#PBF datasheet, LTC4364HS-1#PBF pinout, LTC4364HS-1#PBF application, or LTC4364HS-1#PBF equivalent, key selection criteria include latch-off behavior under overvoltage, –40°C to +125°C operating range, SO-16 package thermal performance (θ_JA = 100°C/W), and precise 1.25V FB reference for adjustable clamp voltage.

Technical Context

The LTC4364HS-1#PBF implements dual-loop control: a voltage amplifier regulates HGATE to hold FB at 1.25V during overvoltage, while a current amplifier limits ∆V_SENSE–OUT to 50mV (or 25mV during output short). Its fault timer uses TMR pin charging proportional to (V_CC – V_OUT) to enforce SOA-safe turn-off timing.

It integrates two independent gate drivers: HGATE controls the main N-MOSFET pass device for surge regulation, and DGATE controls a second N-MOSFET for ideal diode operation with 30mV forward voltage regulation and fast reverse-current shutdown. UV/OV comparators disable HGATE below 1.25V UV threshold or above 1.25V OV threshold, with UV reset at 0.6V for LTC4364-1.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic SO (Small Outline), θ_JA = 100°C/W, TJ_MAX = 150°C. Exposed pad not present (SO package).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4365HS-1#PBF and TPS26631RHFR, LTC4364HS-1#PBF uniquely combines latch-off behavior, –40V reverse input tolerance, and active ideal diode control in a single AEC-Q100-qualified SO-16 package - making it the only option for automotive load-dump-critical systems requiring guaranteed single-fault shutdown and reverse-battery resilience.

Availability

LTC4364HS-1#PBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial 24V/48V systems, and redundant supply ORing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4364HS-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 LTC4364HS-1#PBF belongs to the Surge Stopper family, designed specifically for automotive and industrial power systems requiring robust overvoltage, undervoltage, reverse-input, and overcurrent protection with minimal external components.

FAQ

What is the key functional difference between LTC4364HS-1#PBF and LTC4364HS-2#PBF?

The LTC4364HS-1#PBF latches off the HGATE driver after fault timeout - requiring manual reset via SHDN or UV pin - while the LTC4364HS-2#PBF automatically retries after a cool-down cycle. This makes LTC4364HS-1#PBF appropriate for safety-critical systems where uncontrolled restart could compromise integrity, such as engine control modules.

Can LTC4364HS-1#PBF regulate output voltage to a value other than 27V?

Yes. The LTC4364HS-1#PBF regulates output using the FB pin and an external resistor divider referenced to its internal 1.25V bandgap. By selecting appropriate R1/R2 values (e.g., 102kΩ and 4.99kΩ), users can set clamp voltages from ~5V to >60V - confirmed in the datasheet's Figure 1 and Electrical Characteristics table.

Does LTC4364HS-1#PBF require external MOSFETs, and what are the critical selection criteria?

Yes, LTC4364HS-1#PBF requires two external N-channel MOSFETs: one for HGATE-controlled surge limiting and one for DGATE-controlled ideal diode operation. Critical criteria include R_DS(ON) (for conduction loss), SOA rating (to survive fault energy), and gate charge (to ensure fast switching with 130mA drive capability).

How does LTC4364HS-1#PBF handle reverse input conditions, and what is its absolute rating?

LTC4364HS-1#PBF withstands –40V applied to the VCC pin relative to GND without damage. During reverse battery events, it pulls both HGATE and DGATE to SOURCE potential, turning off both MOSFETs and blocking reverse current - eliminating need for external reverse-polarity protection components.

What thermal considerations apply to LTC4364HS-1#PBF in the SO-16 package?

LTC4364HS-1#PBF in the 16-Lead Plastic SO package has θ_JA = 100°C/W. At maximum 125°C ambient and 150°C junction limit, allowable power dissipation is ~250mW. Layout must include ≥2 cm² of 2-oz copper pour connected to GND pins to achieve rated thermal performance.