Analog Devices Inc. LTC4249AV2-2#PBF

Overview

LTC4249AV2-2#PBF from Analog Devices is a 65V dual-channel electronic circuit breaker (ECB) with precision current monitoring, auto-retry fault response, and integrated 75mΩ N-channel MOSFET switches. It delivers independent overcurrent protection for two high-voltage loads, features 5% accurate analog current monitor outputs (IMON1/IMON2), supports adjustable ECB thresholds up to 1.2A per channel via single resistor configuration, and is deployed in GaN PA bias sequencing and 5G mMIMO array protection.

For engineers reviewing the LTC4249AV2-2#PBF datasheet, LTC4249AV2-2#PBF pinout, LTC4249AV2-2#PBF application, or LTC4249AV2-2#PBF equivalent, key selection considerations include its auto-retry fault behavior (vs latch-off variants), 20(12)-lead 3mm × 4mm LQFN package with high-voltage spacing, dual 1.2A ECB channels with filtered primary (50µs) and fast secondary (2µs) overcurrent detection, and compatibility with voltage-based enable schemes for undervoltage lockout.

Technical Context

The LTC4249AV2-2#PBF implements two independent ECB channels, each with a precision 0.8V enable threshold (±2.5% over temperature), open-drain RDY status output, and analog IMON current monitor sourcing 100µA/A (±5% accuracy from 30mA–1.2A). Its dual-comparator OC detection uses a filtered 1.2V primary threshold (±2.5%) and unfiltered 2.4V secondary threshold (±5%) for robust fault discrimination.

It integrates automatic inrush control (1A current-limited charge for 10ms), short-circuit detection (OUT < 1.2V within 300µs of enable), overtemperature protection, and internal bias generation from IN1 (6V–65V), requiring IN1 ≥ 6V for IN2 operation. The auto-retry mode enables automatic recovery after a 1-second cool-down period following fault events.

Key Specifications

Pinout & Package

20(12)-lead LQFN package (3mm × 4mm × 0.95mm) with exposed thermal pad (Pin 21 = GND). Designed for high-voltage clearance: increased spacing between IN/OUT pins meets IPC-2221B Class B requirements for 65V DC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4249AV2-2#PBF, the LTC4249AV-2#PBF offers identical functionality in a smaller package but sacrifices high-voltage clearance, while the TPS25982LMLR provides higher current-sense accuracy in a single channel but lacks dual-channel integration, auto-retry, and analog monitoring-making it unsuitable for GaN PA sequencing or mMIMO isolation.

Availability

LTC4249AV2-2#PBF is available at Aetrix Electronics and suitable for 5G infrastructure, industrial automation, and RF test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability for safety-critical designs.

Supply support for LTC4249AV2-2#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 precision instrumentation, communications, and industrial markets since 1965.

The LTC4249AV2-2#PBF belongs to Analog Devices' PowerPath™ and Hot Swap™ product line, engineered specifically for robust, high-voltage electronic circuit protection and intelligent power management in RF, telecom, and safety-critical systems.

FAQ

What fault response mode does the LTC4249AV2-2#PBF implement?

The LTC4249AV2-2#PBF implements auto-retry fault response: after an overcurrent, short-circuit, or overtemperature event, it automatically attempts recovery after a fixed 1-second cool-down period. This differs from latch-off variants (e.g., LTC4249AV2-1#PBF) that require manual enable toggling. The auto-retry behavior is inherent to the -2 suffix and cannot be configured via pins or registers.

How is the overcurrent threshold set on the LTC4249AV2-2#PBF?

The LTC4249AV2-2#PBF overcurrent threshold is set using a single resistor (R_IMON) from IMONx to GND. With a standard 100µA/A current monitor gain and 1.2V primary OC threshold, R_IMON = 1.2V / I_ECB × 10,000 yields the desired trip current (e.g., 10kΩ for 1.2A). The secondary (fast) OC threshold is always exactly twice the primary value (2.4V).

Can the LTC4249AV2-2#PBF operate with IN2 powered independently of IN1?

No. The LTC4249AV2-2#PBF requires IN1 ≥ 6V to power its internal LDO and bias circuitry; IN2 is only functional when IN1 is properly biased. Attempting to operate IN2 without IN1 ≥ 6V will result in undefined behavior or non-operation. This dependency is documented in the Absolute Maximum Ratings and Applications Information sections of the datasheet.

What is the maximum allowable output capacitance for the LTC4249AV2-2#PBF?

The LTC4249AV2-2#PBF supports a maximum output capacitance of 100µF per channel. This limit ensures successful inrush charging (1A for 10ms) and prevents violation of the safe operating area during startup. Exceeding 100µF risks incomplete charging within the 10ms window, triggering short-circuit detection and ECB shutdown.

Does the LTC4249AV2-2#PBF provide reverse current protection?

The LTC4249AV2-2#PBF does not provide intrinsic reverse current protection in standard configuration. However, reverse current blocking can be implemented by back-to-back connecting two LTC4249AV2-2#PBF channels (or using one channel per direction), leveraging their bidirectional current sensing and independent control. This topology is explicitly supported in the Applications Information section.