Analog Devices Inc. LTC4249AV-1#PBF

Overview

LTC4249AV-1#PBF from Analog Devices is a 65V dual-channel electronic circuit breaker (ECB) with precision current monitoring, latch-off fault response, and integrated 75mΩ N-channel MOSFET switches. It delivers independent overcurrent protection for two high-voltage loads, features 5% accurate analog IMON outputs (100µA/A), and supports bias sequencing in GaN PA arrays. Designed for industrial safety and 5G mMIMO base station power management, it operates from –40°C to 125°C in a 16-lead 3mm × 3mm LQFN package.

For engineers reviewing the LTC4249AV-1#PBF datasheet, LTC4249AV-1#PBF pinout, LTC4249AV-1#PBF application, or LTC4249AV-1#PBF equivalent, key selection considerations include its dual-channel 1.2A adjustable ECB threshold, filtered primary OC detection (50µs), fast secondary OC response (2µs), ±2.5% EN threshold accuracy for UVLO implementation, and open-drain RDY status signaling for sequenced load enable.

Technical Context

The LTC4249AV-1#PBF implements two independent high-side ECB channels with internal gate drivers, short-circuit detection (2µs response), and automatic inrush control (1A/10ms). Each channel uses a single external resistor (R_IMON) to set the primary overcurrent threshold (1.2V at IMON), with a secondary fast-trip threshold at 2.4V.

Its architecture integrates an internal LDO powered from IN1, enabling operation of IN2 only when IN1 ≥ 6V. The device employs dual comparators per channel - one filtered (50µs time constant) for stable primary OC tripping near threshold, and one unfiltered for rapid short-circuit shutdown - alongside overtemperature protection and thermal foldback.

Key Specifications

Pinout & Package

Package: 16-lead 3mm × 3mm × 0.95mm LQFN with exposed thermal pad (Pin 17 = GND). θ_JA = 40°C/W; requires PCB thermal plane connection for full 125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual electronic circuit breaker applications.

Compared with LTC4249AV-2#PBF and LTC4249AV2-1#PBF, the LTC4249AV-1#PBF uniquely combines latch-off fault handling with the smallest possible LQFN package, making it optimal for safety-critical, space-limited 5G infrastructure where controlled reset and minimal board area are design priorities.

Availability

LTC4249AV-1#PBF is available at Aetrix Electronics and suitable for 5G mMIMO base stations, industrial safety interlocks, and telecom power distribution systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC4249AV-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 healthcare markets.

The LTC4249 belongs to Analog Devices' PowerPath™ and Hot Swap™ product line, engineered specifically for robust, high-voltage electronic circuit protection and intelligent power management in mission-critical infrastructure equipment.

FAQ

What is the maximum continuous current rating per channel for the LTC4249AV-1#PBF?

The LTC4249AV-1#PBF supports a maximum steady-state ECB current of 1.2A per channel, as specified in the Electrical Characteristics table under IMAX. This rating assumes proper PCB thermal design with the exposed pad connected to a ground plane and ambient temperature ≤125°C. Exceeding 1.2A triggers the primary overcurrent comparator at the configured IMON threshold.

How does the LTC4249AV-1#PBF implement undervoltage lockout (UVLO) on its enable inputs?

The LTC4249AV-1#PBF uses a precision 0.8V internal reference with ±2.5% accuracy across temperature on EN1/EN2. By connecting a resistive divider from IN1 (or another supply) to EN, designers configure a custom UVLO threshold - for example, 10.8V rising threshold using 100kΩ and 8.06kΩ resistors. The 35mV hysteresis prevents chatter near the threshold.

Can the LTC4249AV-1#PBF be used with IN2 powered independently of IN1?

No. The LTC4249AV-1#PBF requires IN1 ≥ 6V to power its internal LDO, which biases core circuitry including the EN2 comparator and IN2 channel driver. If IN1 is absent or below 6V, IN2 cannot operate - this dependency is explicitly stated in the Pin Functions section and Absolute Maximum Ratings table.

What is the purpose of the two different overcurrent thresholds (1.2V and 2.4V) on the IMON pin of the LTC4249AV-1#PBF?

The 1.2V threshold (VECB1) is the primary, filtered overcurrent trip point - designed to reject noise and provide stable operation near the set current limit. The 2.4V threshold (VECB2) is the secondary, unfiltered fast-trip point - responding in 2µs to severe overcurrent or short-circuit events. This dual-threshold architecture ensures both precision and speed without compromise.

Does the LTC4249AV-1#PBF require external components for inrush current limiting?

No. The LTC4249AV-1#PBF integrates automatic inrush control: upon enable, each channel delivers a regulated 1A charging current to OUT for 10ms, safely ramping up capacitive loads up to 100µF. This eliminates the need for external soft-start circuitry, reduces BOM count, and prevents input rail sag during startup.