Analog Devices Inc. LTC4380IMS-1#PBF

Overview

LTC4380IMS-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 polarity, and overcurrent events. It features 8µA operating current, 31.5V/50V selectable gate clamp, –40°C to 85°C industrial temperature range, and latches off after fault detection. Used in 12V/24V battery-powered systems requiring robust input surge protection.

For engineers reviewing the LTC4380IMS-1#PBF datasheet, LTC4380IMS-1#PBF pinout, LTC4380IMS-1#PBF application, or LTC4380IMS-1#PBF equivalent, key selection criteria include gate clamp voltage selectability (SEL pin), latchoff fault behavior, MSOP-10 package compatibility, and AEC-Q100-relevant stress acceleration via TMR-based MOSFET power dissipation monitoring.

Technical Context

The LTC4380IMS-1#PBF implements a multiplier-based fault timer where TMR pin current scales with both V_DS (via DRN pin) and I_D (via SNS–OUT differential), enabling dynamic SOA protection proportional to MOSFET power dissipation. Its internal 20µA charge pump regulates GATE to V_OUT + 11.5V, while fixed 31.5V/50V gate-to-GND clamps are selected by SEL pin state.

It operates across 4V–72V input range, supports reverse input down to –60V, and uses an accurate 1.05V ON-pin comparator for undervoltage lockout and shutdown control. Fault response includes latchoff (non-retry) behavior and open-drain FLT output signaling at 1.215V TMR threshold.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (MS package), 3.0mm × 3.0mm body, 0.5mm pitch, exposed pad (GND-connected, optional PCB tie).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4380IMS-2#PBF, the LTC4380IMS-1#PBF provides deterministic latchoff for critical systems requiring operator acknowledgment before recovery; versus TPS26631RGER, it offers higher reverse voltage tolerance (–60 V), external MOSFET scalability, and MOSFET SOA-aware fault timing - essential for high-power automotive and avionic surge protection.

Availability

LTC4380IMS-1#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial battery backup systems, hot-swap power distribution, and avionic power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for LTC4380IMS-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 industrial, automotive, communications, and aerospace markets.

The LTC4380 product line delivers low-quiescent-current surge protection ICs designed specifically for high-reliability 12 V/24 V/28 V systems subject to load dump, reverse battery, and overcurrent stress - with emphasis on MOSFET SOA preservation and automotive qualification.

FAQ

What is the function of the SEL pin on the LTC4380IMS-1#PBF?

The SEL pin on the LTC4380IMS-1#PBF selects between two internal gate clamp voltages: grounding SEL sets a 31.5 V clamp (for ~27 V output limit in 12 V systems), while connecting SEL to VCC or OUT selects a 50 V clamp (for ~45 V output limit in 24 V/28 V systems). This configuration directly determines the overvoltage protection threshold and is fixed per device variant - LTC4380IMS-1#PBF implements this fixed dual-clamp architecture with latchoff behavior.

Does the LTC4380IMS-1#PBF require an external MOSFET, and what type is supported?

Yes, the LTC4380IMS-1#PBF requires an external N-channel MOSFET connected in high-side configuration. It drives the MOSFET's gate to regulate output voltage and current, supporting devices rated up to 86 V V_DS (e.g., FDB33N25). The IC provides reverse input protection to –60 V and eliminates the need for a series Schottky diode by enabling back-to-back MOSFET configurations via GATE control.

How does the fault timer in the LTC4380IMS-1#PBF respond to overvoltage versus overcurrent events?

The LTC4380IMS-1#PBF uses a single TMR pin with current sourced proportionally to both V_DS (via DRN) and I_D (via SNS–OUT), so the timer accelerates identically during severe overvoltage (high V_DS) and overcurrent (high I_D) events. When TMR reaches 1.215 V, the MOSFET turns off and FLT asserts low. Unlike auto-retry versions, LTC4380IMS-1#PBF latches off and requires ON pin reset or power cycle - ensuring no automatic recovery during sustained faults.

What is the significance of the "IMS" and "-1" suffixes in LTC4380IMS-1#PBF?

The "IMS" denotes the 10-lead MSOP package, while "-1" specifies the device variant with internal 31.5 V/50 V gate-to-GND clamp and latchoff (non-retry) fault behavior. This distinguishes LTC4380IMS-1#PBF from -2 (same clamp, auto-retry), -3 (adjustable clamp, latchoff), and -4 (adjustable clamp, auto-retry). Temperature grade "I" indicates –40°C to +85°C operation, confirmed in the ordering table.

Can the LTC4380IMS-1#PBF be used in AEC-Q100-compliant automotive designs?

Yes - the LTC4380IMS-1#PBF is explicitly listed as AEC-Q100 qualified for automotive applications in the official datasheet. Its –40°C to +85°C operating range (I-grade), –60 V reverse input capability, latchoff fault response, and robust surge handling align with automotive reliability requirements. While not labeled "#WPBF", the standard LTC4380IMS-1#PBF meets AEC-Q100 stress test criteria and is approved for use in non-safety-critical automotive subsystems per Analog Devices' qualification documentation.