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Analog Devices Inc./Maxim Integrated MAX5980GTJ+T
- Part No.:
- MAX5980GTJ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX5980GTJ+T.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,469
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Product details
Overview
MAX5980GTJ+T from Maxim Integrated is a quad IEEE 802.3at/af-compliant Power Sourcing Equipment (PSE) controller for PoE midspan and endpoint systems. It performs PD discovery, classification (including Class 5), current-limit control, and DC load-disconnect detection across four independent ports. Each port delivers up to 70W with 0.25Ω current-sense resistor support and operates over -40°C to +105°C.
For engineers reviewing the MAX5980GTJ+T datasheet, MAX5980GTJ+T pinout, MAX5980GTJ+T application, or MAX5980GTJ+T equivalent, this device is selected for high-reliability, software-configurable PoE power management in switches, routers, and midspan injectors requiring precise 9-bit port current/voltage monitoring, I²C-based real-time diagnostics, and automotive-grade thermal robustness.
Technical Context
The MAX5980GTJ+T implements a fully integrated PSE state machine per port, supporting both legacy 1-event and IEEE 802.3at-defined 2-event classification. Its analog front-end includes Kelvin-connected SENSE_/SVEE_ inputs, programmable current-limit thresholds (101–455mV), and foldback protection triggered at VAGND–VOUT ≥18V (Class 4) or ≥32V (Class 0–3).
It features an I²C-compatible 3-wire serial interface (up to 400kHz) with register-mapped control of port enable/disable, classification mode (EN_CL5), midspan timing (MIDSPAN), and auto/manual operation (AUTO). Internal biasing enables single-supply operation from 32V to 60V (VAGND–VEE), with VDD regulated at 3.3V ±3% for digital logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with 802.3at (PoE+) and 802.3af (PoE) standards, including Class 5 detection and 2-event classification. |
| Port Power Capability | Up to 70W per port when Class 5 is enabled; supports legacy high-capacitance PDs without false disconnect. |
| Current Sensing | 0.25Ω external sense resistor; 9-bit ADC provides 1.956mA (Classes 0–4) or 3.912mA (Class 5) LSB resolution. |
| Operating Voltage | VAGND–VEE range: 32V to 60V; VDD output: 3.3V ±3% at up to 10mA load. |
| Thermal Protection | Thermal shutdown at +140°C with 20°C hysteresis; rated for continuous operation from –40°C to +105°C. |
| Detection & Classification | Detection probe voltages: 4.0V (Phase 1) and 9.1V (Phase 2); classification voltage: 15.5–20V; Class 4/5 threshold: 45–51mA. |
| Interface | I²C-compatible 3-wire serial interface (SCL/SDAOUT/SDAIN) with slave address configurable via A0–A3 pins. |
Pinout & Package
MAX5980GTJ+T is housed in a 32-pin TQFN-EP package (5mm × 5mm, exposed pad connected to VEE), optimized for thermal dissipation in high-power PoE applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL, SDAOUT, SDAIN | I²C-compatible serial interface | Enable full software configuration, real-time port current/voltage readout, and interrupt-driven event reporting. |
| GATE1–GATE4 | External MOSFET gate drivers | Drive discrete N-channel MOSFETs per port; provide 8.5–10.5V gate overdrive with strong pulldown (25mA) for fast turn-off. |
| SENSE1–SENSE4 / SVEE1 / SVEE2 | Current-sense differential inputs | Kelvin-connected inputs for accurate 0.25Ω sense resistor measurement; SVEE1 handles Ports 1/2, SVEE2 handles Ports 3/4. |
| OUT1–OUT4 | Port output voltage sense | Monitor PoE output voltage per port; used for PGOOD assertion (1.5–2.5V threshold) and slew-rate limiting during startup. |
| EN_CL5, AUTO, MIDSPAN | Hardware configuration inputs | EN_CL5 enables Class 5 detection; AUTO selects auto/shutdown default mode; MIDSPAN configures cadence timing for midspan collision avoidance. |
| INT | Open-drain interrupt output | Asserts low on port fault, classification completion, or detection event; supports microcontroller polling or interrupt-driven response. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-port IEEE 802.3at/af compliance | Enables simultaneous management of four PoE ports in a single IC, reducing BOM count and PCB area vs. discrete controllers. |
| Class 5 support with 2-event classification | Allows detection and classification of up to 70W PDs while maintaining backward compatibility with legacy 12.95W (Class 4) and lower devices. |
| DC load-disconnect detection | Triggers port shutdown within 300–400ms when sensed current falls below 1.25–2.5mV threshold, preventing phantom loads and improving system efficiency. |
| Programmable current-limit foldback | Reduces delivered current above defined VAGND–VOUT thresholds (18V/32V), protecting cables and MOSFETs during sustained overload or short-circuit conditions. |
| Integrated VDD regulator | Eliminates need for external LDO; supplies stable 3.3V ±3% to internal logic and I²C interface from the main PoE supply rail. |
Applications
| Enterprise Switches | Midspan PoE Injectors |
|---|---|
Use Scenario: 24- or 48-port managed Ethernet switches delivering PoE++ to IP phones, wireless APs, and PTZ cameras. IC Role / Device Role / Timing Role: PSE controller managing all four ports per MAX5980GTJ+T die; performs autonomous detection/classification and real-time current monitoring. Use Value: Enables per-port 70W delivery with Class 5 support, reducing need for multiple controllers and simplifying thermal layout in dense switch designs. |
Use Scenario: Standalone 4-port midspan injector adding PoE capability between legacy non-PoE switches and powered devices. IC Role / Device Role / Timing Role: Primary PSE controller implementing cadence timing (via MIDSPAN pin) to avoid detection collisions in multi-injector deployments. Use Value: Ensures reliable interoperability in daisy-chained or stacked injector configurations without manual timing coordination. |
| Industrial Routers | Smart Building Controllers |
Use Scenario: Ruggedized outdoor routers powering surveillance cameras and environmental sensors in harsh environments. IC Role / Device Role / Timing Role: Automotive-grade (-40°C to +105°C) PSE controller providing fault-tolerant power management with thermal shutdown and UVLO/OVLO protection. Use Value: Guarantees uninterrupted PoE operation under wide ambient temperature swings and unstable input rails common in industrial settings. |
Use Scenario: Central building management units powering access control readers, LED lighting nodes, and HVAC actuators over structured cabling. IC Role / Device Role / Timing Role: Software-configurable PSE enabling remote diagnostics, dynamic power budgeting, and scheduled port cycling via I²C interface. Use Value: Supports centralized energy optimization and predictive maintenance through real-time current/voltage telemetry per port. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip LAN9354 | Integrated 4-port Ethernet PHY + PSE controller; requires external MOSFETs; no Class 5 support; 32-pin QFN but different pinout and register map. | Targeted at cost-sensitive, lower-power (≤30W/port) embedded switch designs where PHY integration reduces component count. | Select LAN9354 only if PHY integration is required and Class 5 power is not needed; MAX5980GTJ+T remains preferred for pure high-power PSE control. |
| Analog Devices LT4275A | Single-port IEEE 802.3at PSE controller; supports Class 4 only; 20-pin TSSOP; lacks 2-event classification, DC disconnect, and integrated VDD regulator. | Suitable for modular or scalable PSE designs where per-port flexibility and board space allow discrete controllers per port. | Choose LT4275A for incremental upgrades of legacy single-port systems; MAX5980GTJ+T offers higher integration, Class 5, and quad-port efficiency. |
Compared with LAN9354 and LT4275A, the MAX5980GTJ+T uniquely combines quad-port Class 5 support, integrated VDD regulation, DC load-disconnect detection, and automotive temperature rating-making it optimal for compact, high-power, field-diagnosable PoE infrastructure.
Availability
MAX5980GTJ+T is available at Aetrix Electronics and suitable for enterprise switches, midspan PoE injectors, and industrial routers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX5980GTJ+T 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 solutions for industrial, communications, and automotive markets.
The MAX5980GTJ+T belongs to Maxim's Power-over-Ethernet controller product line, designed specifically to simplify high-power, standards-compliant PSE implementation in space-constrained, thermally demanding networking equipment.
FAQ
What is the maximum power per port supported by the MAX5980GTJ+T?
The MAX5980GTJ+T supports up to 70W per port when Class 5 detection and classification are enabled. This requires proper external MOSFET selection, heatsinking, and adherence to IEEE 802.3at specifications. The device maintains full 802.3af compatibility for lower-power devices without reconfiguration.
Does the MAX5980GTJ+T require external MOSFETs, and what gate drive capability does it provide?
Yes, the MAX5980GTJ+T requires external N-channel MOSFETs per port. It provides dedicated GATE1–GATE4 outputs with 8.5–10.5V gate overdrive, –60µA pullup current, and 25mA strong pulldown current to ensure fast, controlled switching and reliable fault shutdown.
How does the MAX5980GTJ+T handle detection of legacy high-capacitance PDs?
The MAX5980GTJ+T retains high-capacitance detection capability even with Class 5 enabled, using adaptive probing and extended timing windows. Its detection circuitry meets IEEE 802.3af requirements for capacitive loads up to 150nF, ensuring interoperability with older VoIP phones and other legacy devices.
Can the MAX5980GTJ+T operate in both endpoint and midspan PoE topologies?
Yes, the MAX5980GTJ+T supports both endpoint (e.g., integrated into a switch ASIC) and midspan (standalone injector) modes. The MIDSPAN pin configures cadence timing for collision avoidance in midspan deployments, while software registers allow per-port mode selection independent of hardware strapping.
What level of diagnostic visibility does the MAX5980GTJ+T provide through its I²C interface?
The MAX5980GTJ+T provides real-time, 9-bit resolution readout of port current and voltage via its I²C interface, along with status registers for detection/classification events, fault conditions, and port state. This enables field diagnostics, power budgeting, and predictive maintenance without additional sensing components.
MAX5980GTJ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 70 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 32V ~ 60V
- Current - Supply:
- 5mA
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX5980GTJ+T FAQ
1.How can I place an order for MAX5980GTJ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5980GTJ+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX5980GTJ+T reliable?
The price and inventory of MAX5980GTJ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5980GTJ+T is usually 5 days.
3.What payment methods are accepted for MAX5980GTJ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5980GTJ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5980GTJ+T?
MAX5980GTJ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5980GTJ+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX5980GTJ+T?
For technical support, including MAX5980GTJ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5980GTJ+T requirements.
6.How does Aetrix verify that MAX5980GTJ+T is sourced from the original manufacturer or authorized distributors?
All MAX5980GTJ+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX5980GTJ+T meets industry standards.
7.What is the process for return or replacement of MAX5980GTJ+T?
All MAX5980GTJ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5980GTJ+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX5980GTJ+T part is unused and in its original packaging.
Return procedure for MAX5980GTJ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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