Analog Devices Inc./Maxim Integrated MAX5969DETE+

Overview

MAX5969DETE+ from Maxim Integrated is an IEEE 802.3af/at-compliant powered device (PD) interface controller with integrated n-channel isolation MOSFET, providing detection signature (24.9kΩ), 2-event classification support, and inrush current limiting (≤180mA). It operates across -40°C to +85°C in PoE-powered IP security cameras and wireless access nodes.

For engineers reviewing the MAX5969DETE+ datasheet, MAX5969DETE+ pinout, MAX5969DETE+ application, or MAX5969DETE+ equivalent, key selection criteria include 100V input absolute maximum rating, dual UVLO thresholds (VON = 35.4V, VOFF = 31V), integrated thermal shutdown (+140°C), and wall adapter detection capability with 9V WAD threshold.

Technical Context

The MAX5969DETE+ implements a four-mode state machine-detection (1.4–10.1V), classification (12.6–20V), mark event (falling <11.6V), and power mode (>35.4V)-with hardware-based 2-event classification signaling via 2EC current sink (1.5mA) and automatic wall adapter handover when VWAD–RTN > 9V.

Its integrated 0.7Ω (typ) isolation MOSFET features di/dt-controlled turn-on, foldback current limiting at VRTN ≥ 16.5V, and PG output timing synchronized to MOSFET gate drive completion (tDELAY = 96ms typ), ensuring safe downstream DC-DC converter enablement only after stable RTN voltage establishment.

Key Specifications

Pinout & Package

MAX5969DETE+ uses a thermally enhanced 16-pin, 5mm × 5mm TQFN-EP package with exposed pad (EP) soldered to PCB ground plane for optimal thermal dissipation (θ_JA = 35°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar powered device interface applications.

Compared with LT4275IMS#PBF and TPS23753APWR, the MAX5969DETE+ uniquely integrates 2-event classification signaling, wall adapter detection with priority arbitration, and a thermally optimized 0.7Ω MOSFET-making it the only single-chip solution for compact, dual-source IEEE 802.3at PDs requiring zero-interruption power handover.

Availability

MAX5969DETE+ is available at Aetrix Electronics and suitable for IP security cameras, wireless access nodes, VoIP phones, and industrial IoT gateways requiring stable component supply, extended temperature operation (-40°C to +85°C), and IEEE 802.3at compliance.

Supply support for MAX5969DETE+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX5969D product line delivers integrated PoE PD controllers with embedded power switches and intelligent power arbitration-designed specifically for space-constrained, dual-source powered devices in networking and surveillance equipment.

FAQ

What is the absolute maximum input voltage rating for the MAX5969DETE+?

The MAX5969DETE+ has an absolute maximum input voltage rating of 100V across VDD to VSS. This rating allows the device to withstand transient surges common in PoE cabling while operating continuously within its 36V to 60V functional input range. The 100V rating provides design margin against lightning-induced spikes and inductive kickback, ensuring long-term reliability in harsh Ethernet environments. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table when designing for sustained high-voltage conditions.

How does the MAX5969DETE+ handle wall adapter detection and power source arbitration?

The MAX5969DETE+ detects wall adapter presence via the WAD pin, triggering when the voltage between WAD and RTN exceeds 9V. Upon detection, it immediately disables the internal isolation MOSFET, asserts the 2EC current sink, and disables classification current-ensuring zero-interruption handover from PoE to auxiliary power. The MAX5969DETE+ gives unconditional priority to the wall adapter, eliminating the need for external logic or microcontroller intervention. This behavior is hardwired and deterministic, making it ideal for fail-safe backup power architectures.

What is the purpose and timing behavior of the PG (power-good) output on the MAX5969DETE+?

The PG output on the MAX5969DETE+ is an open-drain signal that sinks 230µA to hold downstream DC-DC converters in reset until the internal isolation MOSFET is fully enhanced. It remains low for a minimum of 87ms (typical 96ms) after VIN exceeds VON, ensuring stable RTN voltage before enabling power conversion. PG also pulls low during thermal shutdown recovery and sleep mode. This precise timing eliminates the need for external delay circuits and guarantees safe inrush management without risking DC-DC latch-up or output overshoot.

Does the MAX5969DETE+ support IEEE 802.3bt (PoE++)?

No, the MAX5969DETE+ is compliant only with IEEE 802.3af and 802.3at standards. It supports two-event classification for Type 2 PSEs but does not implement the four-pair power delivery, autoclass, or higher-power classification schemes required for 802.3bt (up to 90W). Its maximum continuous current limit of 880mA aligns with 802.3at Class 5 (25.5W), not 802.3bt Classes 6–8. For 802.3bt designs, consider alternatives such as the LT4275 or MAX5980 series, which include multi-pair detection and higher current capability.

What thermal management provisions are built into the MAX5969DETE+?

The MAX5969DETE+ incorporates junction-temperature-based thermal shutdown at +140°C with +28°C hysteresis, automatically disabling the isolation MOSFET, 2EC sink, and LED driver until temperature falls to +112°C. Its 5mm × 5mm TQFN-EP package features an exposed pad thermally connected to VSS, requiring soldering to a large PCB copper plane with ≥6 thermal vias (0.3mm barrel, 1mm pitch) to achieve the specified θ_JA = 35°C/W. These provisions prevent thermal runaway during overload or poor airflow conditions without external thermal sensors or firmware monitoring.