Analog Devices Inc. LTC4380HDD-1#PBF

Overview

LTC4380HDD-1#PBF from Analog Devices is a low-quiescent-current surge stopper IC that controls an external N-channel MOSFET to protect downstream loads from automotive load dump, reverse battery, and overcurrent events. It features 8 µA operating current, 4 V to 72 V input range, fixed 31.5 V/50 V gate clamp selection via SEL pin, and -40°C to 125°C operating temperature. Used in high-reliability automotive power rails where sustained overvoltage must be clamped without shutdown.

For engineers reviewing the LTC4380HDD-1#PBF datasheet, LTC4380HDD-1#PBF pinout, LTC4380HDD-1#PBF application, or LTC4380HDD-1#PBF equivalent, key selection criteria include gate clamp voltage configuration (SEL = GND → 31.5 V), latchoff fault behavior, AEC-Q100 qualification, and compatibility with back-to-back MOSFET reverse protection topologies.

Technical Context

The LTC4380HDD-1#PBF implements a multiplier-based fault timer that generates TMR current proportional to both V_DS (via DRN pin) and I_D (via SNS–OUT differential), enabling MOSFET stress–adaptive timing. Its internal 20 µA charge pump regulates GATE to V_OUT + 11.5 V during normal operation, while dual internal gate clamps (31.5 V or 50 V referenced to GND) limit output voltage during overvoltage.

It integrates undervoltage detection on the ON pin (1.05 V threshold with 45 mV hysteresis), open-drain FLT output for fault signaling, and supports latchoff-only fault recovery-requiring either ON pin pulse (<100 µs low) or power cycle to reset after overvoltage or overcurrent shutdown.

Key Specifications

Pinout & Package

Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11 = GND, optional PCB connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4380HDD-2#PBF, the LTC4380HDD-1#PBF provides deterministic latchoff behavior essential for safety-critical automotive modules, while LTC4365HDD-1#PBF trades external MOSFET flexibility and wide voltage range for monolithic simplicity and lower component count.

Availability

LTC4380HDD-1#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, reverse battery hardened power supplies, and high-reliability always-on modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4380HDD-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The LTC4380 product line delivers precision-controlled surge protection for harsh automotive and industrial power rails, designed specifically to replace discrete TVS + MOSFET solutions with integrated timing, sensing, and latchoff safety logic.

FAQ

What is the gate clamp voltage configuration for LTC4380HDD-1#PBF?

The LTC4380HDD-1#PBF has fixed internal gate clamp voltages: 31.5 V when SEL is tied to GND (for 12 V systems), or 50 V when SEL is tied to VCC (for 24 V/28 V systems). This is inherent to the "-1" variant and cannot be adjusted externally. The LTC4380HDD-1#PBF does not support fully adjustable clamping like the -3/-4 versions.

Does LTC4380HDD-1#PBF support auto-retry after overvoltage fault?

No. The LTC4380HDD-1#PBF implements latchoff-only fault behavior: once the TMR pin reaches 1.215 V and the MOSFET turns off, the device remains latched off until the ON pin is pulled low for at least 100 µs or power is cycled. Auto-retry is exclusive to the LTC4380-2 and LTC4380-4 variants.

Can LTC4380HDD-1#PBF drive back-to-back N-channel MOSFETs for reverse polarity protection?

Yes. The LTC4380HDD-1#PBF's GATE driver supports back-to-back N-MOSFET configurations by driving the high-side FET's gate relative to its source (OUT), enabling true bidirectional blocking without forward voltage drop. This eliminates Schottky diode losses and thermal derating issues common in reverse-battery protection circuits.

What is the maximum reverse input voltage the LTC4380HDD-1#PBF can withstand?

The LTC4380HDD-1#PBF is rated for –60 V on the VCC pin, verified per Absolute Maximum Ratings. This allows direct connection to vehicle battery terminals without additional reverse-blocking components, provided the ON and SEL pins are also biased within their –60 V to +80 V range.

Is LTC4380HDD-1#PBF AEC-Q100 qualified?

Yes. The LTC4380HDD-1#PBF carries AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient), with full reliability testing including HTOL, TC, UHAST, and ESD per automotive standards. This qualification applies specifically to the H-grade DFN package variant and is documented in Analog Devices' automotive reliability reports.