Analog Devices Inc. LTC4263IDE-1#PBF

Overview

LTC4263IDE-1#PBF from Analog Devices (formerly Linear Technology) is a high-power, single-port Power Sourcing Equipment (PSE) controller with integrated MOSFET for IEEE 802.3af-compliant Power over Ethernet systems. It delivers up to 30W output power, operates from a single 56V supply, features autonomous operation without microcontroller support, and includes precision inrush control with internal sense resistor - used in security cameras, dual-radio WAPs, and RFID readers.

For engineers reviewing the LTC4263IDE-1#PBF datasheet, LTC4263IDE-1#PBF pinout, LTC4263IDE-1#PBF application, or LTC4263IDE-1#PBF equivalent, key selection considerations include its –40°C to +85°C industrial temperature grade, integrated thermal shutdown and foldback current limiting, AC/DC disconnect sensing flexibility, and 14-pin 4mm × 3mm DFN package with exposed VSS pad for thermal management.

Technical Context

The LTC4263IDE-1#PBF implements fully autonomous PSE functionality using force-current two-point detection (235–275μA first point, 160–200μA second point) to determine PD signature resistance (17–29.7kΩ), rejecting noise-sensitive voltage-based methods. Its internal 2.4Ω (typ) MOSFET enables direct port drive with built-in short-circuit protection (IFAULT = 1000mA typ) and foldback current limiting that reduces ILIM below 28V port voltage to limit die heating during inrush.

It supports both endpoint and midspan configurations via pin-selectable MIDSPAN logic input and offers dual disconnect modes: DC disconnect (IMIN = 7.5mA typ) and AC disconnect (fOSC = 110Hz, IACDMIN = 160μA typ), with configurable detection backoff timing (tDBO = 3.2s typ in midspan mode) and maintain-power-signature (MPS) monitoring (tMPS = 20ms min, tMPDO = 350ms typ).

Key Specifications

Pinout & Package

Package: 14-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 15 = VSS). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power single-port PSE controller applications.

Compared with LTC4271CDE#PBF and TPS23753APWR, the LTC4263IDE-1#PBF uniquely balances IEEE 802.3af compliance, autonomous operation, and flexible disconnect modes in a compact DFN - making it optimal for standalone, thermally constrained, or noise-prone industrial PoE endpoints where microcontroller-free simplicity is prioritized over PoE+ scalability.

Availability

LTC4263IDE-1#PBF is available at Aetrix Electronics and suitable for security camera systems, wireless access point injectors, and industrial RFID reader deployments requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for LTC4263IDE-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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. Linear pioneered robust, integrated PoE solutions with emphasis on reliability and ease of system integration.

The LTC4263IDE-1#PBF belongs to Linear's Power over Ethernet PSE controller family, designed specifically for compact, autonomous, high-power single-port injectors targeting industrial, surveillance, and enterprise infrastructure applications.

FAQ

What is the maximum continuous output power supported by the LTC4263IDE-1#PBF?

The LTC4263IDE-1#PBF supports up to 30W of continuous PSE output power per port under IEEE 802.3af-compliant conditions. This is achieved with its internal 2.4Ω (typ) MOSFET, thermal foldback, and precise current limiting (ILIM = 645mA typ at VOUT ≥ 30V), enabling reliable operation with high-power PDs such as PTZ security cameras and dual-radio WAPs.

Does the LTC4263IDE-1#PBF require an external microcontroller to operate?

No, the LTC4263IDE-1#PBF operates fully autonomously without any microcontroller. Its onboard control algorithms handle IEEE 802.3af-compliant detection, power-up sequencing, fault monitoring (overload, short-circuit, thermal), and disconnect sensing - reducing BOM count and eliminating firmware development for basic PSE functionality.

How does the LTC4263IDE-1#PBF implement noise-immune PD detection?

The LTC4263IDE-1#PBF uses forced-current two-point detection: it sources 255μA and 180μA (typ) into the port and measures resulting voltages to compute ΔV/ΔI slope. This method cancels out voltage offsets from series diodes and current offsets from leakage, delivering robust signature resistance measurement (17–29.7kΩ) even in electrically noisy industrial environments - a key advantage over single-point voltage sensing.

What is the purpose of the OSC and ACOUT pins on the LTC4263IDE-1#PBF?

The OSC pin (Pin 7) configures AC disconnect mode: connecting a 0.1μF capacitor to VSS enables a 110Hz internal oscillator, while tying it to VSS disables AC disconnect and activates DC disconnect. The ACOUT pin (Pin 8) outputs the AC signal to the port via an RC network (1kΩ + 0.47μF), allowing impedance-based PD presence detection - offering faster disconnect response than DC methods for cable removal events.

Can the LTC4263IDE-1#PBF be used in both endpoint and midspan PSE configurations?

Yes, the LTC4263IDE-1#PBF supports both configurations. Connecting the MIDSPAN pin (Pin 3) to VDD5 enables 3.2s detection backoff for midspan use, preventing contention with endpoint PSEs on the same link. Leaving MIDSPAN at VSS configures it for endpoint operation with immediate retry after failed detection - verified in the datasheet's timing specifications (tDBO = 3.2s typ and tDETDLY = 620ms max).