Analog Devices Inc. LTC4364HS-2#PBF

LTC4364HS-2#PBF High-Efficiency Surge Stopper with Ideal Diode Product Summary

The Analog Devices LTC4364HS-2#PBF is a robust integrated circuit designed for advanced load protection in environments exposed to significant electrical transients. Positioned as an active surge stopper with an ideal diode controller, the device is tailored to shield sensitive electronic systems from overvoltage, reverse voltage, and overcurrent events. Supporting operation across a wide 4V to 80V input range, withstanding surges well above 80V, and providing precise clamping functionality, the LTC4364HS-2#PBF is suitable for mission-critical applications in automotive, avionics, telecommunication, and industrial power infrastructure.

Main Attributes and Working Principles of LTC4364HS-2#PBF

The LTC4364HS-2#PBF combines a surge stopper with an ideal diode controller, allowing it to effectively protect both input and output rails from destructive events. The device regulates output voltage by controlling an external N-channel MOSFET, limiting the voltage delivered to the load during surge or load dump conditions. Key technical features include:

Wide 4V to 80V operating range with overvoltage clamping capabilities.

Ideal diode function, replacing traditional Schottky diodes for reverse input protection and output hold-up during brownouts.

Reverse input protection down to –40V and reverse output protection to –20V.

Timed, current-limited circuit breaking and fast fault recovery via an adjustable fault timer.

Two operational variants: the LTC4364-1 (latch-off after fault) and the LTC4364-2 (automatic restart after delay), with the LTC4364HS-2#PBF belonging to the latter.

Adjustable output clamp voltage and fault timer enable customization for application-specific requirements.

Rugged overcurrent and short-circuit responses preserve downstream systems.

These functions collectively underpin high reliability in protecting loads from a variety of electrical fault scenarios, especially in systems where robustness and uptime are paramount.

LTC4364HS-2#PBF Pin Layout and Functional Description

The LTC4364HS-2#PBF is offered in a 16-lead SO (Small Outline) package, ensuring compatibility with standard SMT processes. Core pins and their purposes include:

OUT, SENSE: For voltage and current sense at the drain and source of the external MOSFET.

DGATE, HGATE: Gate drivers for the ideal diode and surge stop MOSFETs.

TMR: Adjustable fault timing via an external capacitor, crucial for customizing protection profiles.

VCC: Positive supply input, supporting the full voltage range.

SHDN: Shutdown pin for low-power disable.

ENOUT, FLT: Status and fault output indications for system-level monitoring or sequencing.

UV, OV: Precise control of operation based on underand over-voltage thresholds.

GND: Device ground.

Proper configuration enables the LTC4364HS-2#PBF to dynamically monitor supply states and react efficiently to transient, fault, or reverse polarity conditions.

LTC4364HS-2#PBF Electrical Specifications and Performance Indicators

The device provides robust electrical specifications that enable its protection function:

Quiescent supply current of 370µA (typ.) and shutdown mode at 10µA (typ.) for minimal power overhead.

Clamp voltage and gate drive regulation tightly control voltage and current through external MOSFET switches.

Fault latching and retry sequences are precisely managed via the fault timer and duty cycle logic (typically 0.1% retry duty cycle during faults for the -2 variant).

Rapid propagation delays—typically less than 1µs—ensure the surge stopper responds swiftly to dangerous events, minimizing risk of load exposure.

Protection against reverse input and output currents, with solid clamp levels to handle severe automotive load dumps or industrial switching anomalies.

All key parameters remain stable across automotive temperature ranges (–40°C to +125°C for the ‘H’ grade version).

Together, these characteristics ensure reliable, predictable operation in demanding power environments.

Use Cases Utilizing the LTC4364HS-2#PBF

The LTC4364HS-2#PBF is optimized for use in scenarios where high-reliability circuit protection is essential:

Automotive/avionic ECUs: Guards against engine load dumps, alternator spikes, and battery reverse connections.

Hot-swap circuit cards: Enables safe live insertion/removal of system modules without downtime.

Telecom infrastructure: Protects from unpredictable transients on 24V or 48V rails.

Redundant supply ORing: Ensures continuous operation and seamless switching between power sources.

Industrial/medical: Shields sensitive electronics from industrial noise, brownouts, and supply faults.

In each scenario, the device’s combination of voltage regulation, reverse protection, and customizable time/current limits mitigate risks associated with transient and abnormal power events.

Packaging Details and Environmental Standards of LTC4364HS-2#PBF

The LTC4364HS-2#PBF is provided in a RoHS3-compliant, surface-mountable 16-lead SO package (3.90mm width). The device features:

Moisture Sensitivity Level (MSL) of 1 (unlimited floor life).

AEC-Q100 qualification for automotive applications, underscoring its reliability for harsh environments.

–40°C to 125°C operating ambient temperature range (H-grade qualification).

Full REACH and environmental compliance, ensuring suitability for global designs.

Comparable or Substitute Models for LTC4364HS-2#PBF

When designing with or specifying the LTC4364HS-2#PBF, engineers may evaluate functionally compatible or similar protection devices within the Analog Devices LTC4364 series:

LTC4364-1 variants: For applications requiring latching off after a fault rather than automatic retry.

Other automotive-grade versions: ‘IMS-2’, ‘HMS-2’ packages with AEC-Q100 qualification and varying temperature ratings.

Package alternatives: 14-lead DFN, 16-lead MSOP, and 16-lead SO, depending on board real estate and assembly process.

While less direct, other surge protection and hot-swap controllers with integrated ideal diode control (such as the LTC4365/LTC4366 series) may also serve similar roles, but exact feature and pin compatibility must be checked during selection.

Conclusion

The LTC4364HS-2#PBF from Analog Devices provides a comprehensive solution for engineers requiring high-performance surge and fault protection in critical power supply environments. Its feature set—including a wide operating range, fast ideal diode control, robust reverse polarity guard, and finely tunable behavior—addresses the needs of automotive, industrial, and infrastructure applications. When selecting circuit protection components, engineers and procurement professionals can rely on the LTC4364HS-2#PBF’s proven reliability, robust compliance profile, and operational flexibility to safeguard next-generation electronic systems.