Analog Devices Inc. LTC4249AV2-1#PBF

Overview

LTC4249AV2-1#PBF from Analog Devices is a 65V dual-channel electronic circuit breaker (ECB) with independent overcurrent protection, precision analog current monitoring (±5% accuracy), and latched-off fault response. Each channel features a 75mΩ integrated N-channel MOSFET switch, 0.8V precision enable threshold, and open-drain RDY status output. It is used in GaN PA bias sequencing and 5G mMIMO array protection where high-voltage load isolation and real-time current feedback are required.

For engineers reviewing the LTC4249AV2-1#PBF datasheet, LTC4249AV2-1#PBF pinout, LTC4249AV2-1#PBF application, or LTC4249AV2-1#PBF equivalent, key selection considerations include its 20(12)-lead 3mm × 4mm LQFN package with high-voltage spacing, dual-channel latch-off behavior, ±2.5% EN threshold accuracy over temperature, and configurable 1.2A primary overcurrent threshold via single resistor R_IMON.

Technical Context

The LTC4249AV2-1#PBF implements two independent high-side ECB channels with internal gate drivers, dual-stage overcurrent detection (1.2V filtered primary + 2.4V fast secondary), and automatic inrush control (1A/10ms). IN1 supplies internal bias for both channels, requiring ≥6V to operate IN2.

Each channel integrates short-circuit detection (OUT < 1.2V, 2µs response), overtemperature shutdown, and current-sourced IMON outputs (100µA/A, 5% gain accuracy). The RDY outputs release only after successful inrush charging and remain low during faults or disabled states.

Key Specifications

Pinout & Package

20(12)-lead 3mm × 4mm LQFN package with exposed thermal pad (internally connected to GND). High-voltage spacing between IN/OUT pins meets reinforced insulation requirements for 65V systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4249AV2-1#PBF, LTC4249AV-1#PBF offers identical electrical performance in a smaller package but reduced HV clearance, while TPS26632RGER trades dual-channel capability and analog monitoring for lower cost and auto-retry behavior - neither is pin-compatible.

Availability

LTC4249AV2-1#PBF is available at Aetrix Electronics and suitable for 5G mMIMO infrastructure, industrial safety interlocks, and telecom power distribution requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC4249AV2-1#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, communications, automotive, and healthcare markets.

The LTC4249AV2-1#PBF belongs to Analog Devices' PowerPath™ and Hot Swap™ product line, designed specifically for robust high-voltage load switching, fault protection, and precision current monitoring in mission-critical RF and industrial systems.

FAQ

What is the maximum allowable output capacitance for LTC4249AV2-1#PBF?

The LTC4249AV2-1#PBF supports up to 100µF at each OUT pin during the 10ms inrush phase. Exceeding this value risks incomplete charging within the time window, triggering short-circuit detection. For reliable operation, use ≤100µF with low-ESR ceramic or polymer capacitors placed close to OUT pins, and ensure trace inductance stays below 400nH to avoid energy dissipation issues.

How is the overcurrent threshold configured on LTC4249AV2-1#PBF?

The LTC4249AV2-1#PBF overcurrent threshold is set by a single resistor (R_IMON) from IMON to GND. With 100µA/A scaling and a 1.2V primary threshold, R_IMON = 1.2V / I_ECB × 10kΩ. For example, a 1.2A threshold uses 10kΩ. The secondary 2.4V threshold is fixed at twice the primary value and provides 2µs fast-trip response for severe overloads.

Does LTC4249AV2-1#PBF support paralleling of channels for higher current?

Yes, LTC4249AV2-1#PBF channels may be paralleled to increase total current capacity. Matching of R_ON (±4% channel-to-channel) ensures balanced current sharing. External current-sense resistors are not required, but layout symmetry (equal trace length/impedance) is essential to maintain balance under dynamic loads.

What is the purpose of the INTVCC pin on LTC4249AV2-1#PBF?

The INTVCC pin on LTC4249AV2-1#PBF delivers a regulated 4.2V (3.7–4.7V) supply generated from IN1, powering internal logic and comparators. It must be decoupled with ≥0.01µF to GND and must not be loaded externally or driven - doing so disrupts internal regulation and may cause malfunction or damage.

Can LTC4249AV2-1#PBF operate with IN2 only, without IN1?

No. LTC4249AV2-1#PBF requires IN1 ≥ 6V to power its internal bias rail; IN2 cannot operate independently. If only a 5V supply is available, the datasheet describes a special "5V ONLY" configuration using external biasing of INTVCC, but this mode sacrifices some protections and is not supported for LTC4249AV2-1#PBF in standard operation.