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Analog Devices Inc./Maxim Integrated MAX5984AETI+T
- Part No.:
- MAX5984AETI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX5984AETI+T.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,652
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Product details
Overview
MAX5984AETI+T from Maxim Integrated is a single-port IEEE 802.3af/at Power Sourcing Equipment (PSE) controller with integrated 0.5Ω MOSFET and sense resistor, delivering up to 40W per port. It performs automatic PD discovery, classification (including Class 5 and 2-event), DC/AC load-disconnect detection, and features input UVLO/OVLO, thermal shutdown, and LED status indication. Used in PoE midspan injectors and endpoint switches powering IP cameras and wireless access points.
For engineers reviewing the MAX5984AETI+T datasheet, MAX5984AETI+T pinout, MAX5984AETI+T application, or MAX5984AETI+T equivalent, key selection criteria include Class 5 current-limit programmability via ILIM1/ILIM2 pins, 28-pin TQFN-EP package compatibility, integrated MOSFET RDS(ON) of 0.5Ω (TA = +25°C), AC/DC disconnect thresholds, and -40°C to +85°C industrial temperature rating.
Technical Context
The MAX5984AETI+T implements fully autonomous PSE control logic with no firmware required, using hardware-state machines for detection, classification, and power delivery sequencing. Its integrated 0.5Ω MOSFET and on-chip current-sense resistor eliminate external discrete components while supporting IEEE 802.3af (up to 15.4W) and 802.3at (up to 30W) - plus extended Class 5 operation up to 40W when ILIM1/ILIM2 are configured.
It supports dual disconnect methods: DC disconnect (via OUT current monitoring) and AC disconnect (using OSC-generated triangular waveform and DET current sensing). The 2-EVENT pin enables IEEE 802.3at-compliant two-event classification for high-power PDs, and LEGACY/MIDSPAN pins configure legacy PD support and midspan timing cadence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | 802.3af/at compliant; supports Class 0–5 PDs including 2-event classification for Class 5 |
| Max Output Power | 40W per port (Class 5 enabled); requires VAGND–VEE ≥ 32V and proper ILIM1/ILIM2 configuration |
| Integrated MOSFET | 0.5Ω RDS(ON) at +25°C; eliminates external FET and reduces BOM count and layout area |
| Current Limit Range | 400–998mA (configurable by ILIM1/ILIM2 states); sets overcurrent protection threshold for each PD class |
| Operating Voltage | VAGND–VEE: 32V to 60V; supports standard PoE voltage range with 28.5V UVLO and 62.5V OVLO |
| Package | 28-pin TQFN-EP (5mm × 5mm); exposed pad connected to AGND for thermal performance |
| Temperature Range | -40°C to +85°C; qualified for industrial and networking equipment environments |
Pinout & Package
MAX5984AETI+T uses a 28-pin thin quad flat no-lead (TQFN-EP) package with 5mm × 5mm footprint and exposed thermal pad (EP) connected to AGND. Pin functions are validated per Maxim's official datasheet Rev 0 (12/11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT / OUTP | Power path output terminals | OUT connects to MOSFET drain; OUTP provides port pull-up during detection/classification; routing determines AC vs DC disconnect mode |
| DET | Detection/classification voltage probe | Sources controlled probe voltages (4V/9.3V/16–20V) and senses PD signature current; critical for IEEE-compliant 2-point resistance measurement |
| ILIM1 / ILIM2 | Class 5 current-limit configuration inputs | Digital-select pins (VEE/unconnected) that set Class 5 current limit thresholds (850–998mA) and enable 2-event classification |
| 2-EVENT | Classification mode select | Low-active input enabling IEEE 802.3at two-event classification sequence for high-power PD identification |
| MIDSPAN / LEGACY | System topology configuration | MIDSPAN high enables 2.2s cadence delay for midspan injectors; LEGACY high enables high-capacitance (≤47nF) legacy PD detection |
| LED | Status indicator output | Open-drain output sinking up to 10mA; supports PWM blinking for port state signaling (e.g., detection, classification, fault) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFET + sense resistor | Reduces external component count by ≥4 devices (FET, shunt, gate driver, bias resistors) and simplifies thermal design |
| Programmable Class 5 current limit | Three discrete current-limit settings (850/900/950mA) via ILIM1/ILIM2 pin states, enabling precise 40W delivery with margin |
| AC and DC load-disconnect detection | AC disconnect uses OSC-generated triangle wave + DET current sensing; DC disconnect monitors OUT current below 7.5mA threshold |
| High-capacitance legacy PD support | Enables detection of older PDs with up to 47nF signature capacitance when LEGACY = high, maintaining backward compatibility |
| Thermal and supply monitoring | Integrated +150°C thermal shutdown with 20°C hysteresis; VEE UVLO (28.5V) and OVLO (62.5V) prevent operation outside safe input range |
Applications
| IP Camera Power Delivery | Wi-Fi 6 Access Point Injector |
|---|---|
Use Scenario: Single-port midspan injector powering outdoor PTZ IP cameras with heater/blower loads requiring >25.5W. IC Role / Device Role / Timing Role: PSE controller managing full IEEE 802.3at classification, 40W power ramp-up, and AC disconnect for surge-tolerant operation. Use Value: Eliminates need for external MOSFET and current-sense amplifier; 2-EVENT pin ensures reliable Class 5 handshake with high-power cameras. |
Use Scenario: End-point switch port powering dual-band Wi-Fi 6 APs with integrated PoE circuitry and dynamic load profiles. IC Role / Device Role / Timing Role: Autonomous PSE controller executing detection → classification → power-up in ≤330ms, with thermal foldback during peak transmit bursts. Use Value: Integrated RDS(ON) and current limiting maintain stable 40W delivery without external compensation; LED PWM signals link status to network management. |
| Industrial PoE Repeater | Smart Building Lighting Controller |
Use Scenario: DIN-rail mounted repeater extending PoE distance in factory automation networks with EMI-heavy environments. IC Role / Device Role / Timing Role: Robust PSE controller performing high-capacitance detection (LEGACY = high) and DC disconnect to handle long-cable parasitic capacitance. Use Value: Built-in 28.5V UVLO and 62.5V OVLO protect against brownout and surge-induced rail collapse in unregulated plant power systems. |
Use Scenario: Ceiling-mounted lighting node receiving PoE and driving dimmable LED drivers with variable current draw. IC Role / Device Role / Timing Role: PSE controller enforcing strict Class 4 current limits (720mA typ) and using load-disconnect detection to identify failed LED strings. Use Value: Programmable ILIM1/ILIM2 allows precise current-limit tuning per fixture type; thermal shutdown prevents overheating in enclosed luminaires. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | Single-port 802.3af/at controller with external MOSFET drive; no integrated FET or sense resistor | Requires external 0.1Ω sense resistor and discrete 30V MOSFET; higher BOM cost but greater voltage headroom (up to 100V) | Choose when >60V input or discrete FET optimization is required; not drop-in compatible due to different pinout and external component dependencies |
| TPS23754PWPR | Single-port 802.3af controller with integrated FET; supports only up to Class 4 (30W), no Class 5 or 2-event capability | Lacks IEEE 802.3at Class 5 support and AC disconnect; limited to legacy 15.4W/30W applications | Choose for cost-sensitive 30W-only designs where 40W scalability and advanced disconnect modes are unnecessary |
Compared with LT4275AIMSE#PBF and TPS23754PWPR, the MAX5984AETI+T uniquely integrates both MOSFET and sense resistor while supporting full 802.3at Class 5 (40W) and 2-event classification - reducing board space by ~25% and eliminating external current-sense calibration.
Availability
MAX5984AETI+T is available at Aetrix Electronics and suitable for PoE midspan injectors, enterprise Wi-Fi access point endpoints, and industrial Ethernet repeaters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX5984AETI+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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX5984AETI+T belongs to Maxim's PoE PSE controller product line, engineered specifically for compact, high-efficiency single-port IEEE 802.3af/at power sourcing in space-constrained networking equipment.
FAQ
What is the maximum power delivery capability of the MAX5984AETI+T?
The MAX5984AETI+T delivers up to 40W per port when configured for IEEE 802.3at Class 5 operation. This requires proper setting of ILIM1 and ILIM2 pins to select the appropriate current limit (e.g., 900mA typ), VAGND–VEE ≥ 32V, and a valid Class 5 PD. Without Class 5 enabled, it supports up to 30W (Class 4) or 15.4W (Class 3).
How does the MAX5984AETI+T implement AC versus DC load-disconnect detection?
The MAX5984AETI+T uses OSC pin output to generate a triangular waveform applied to the DET node for AC disconnect sensing, detecting zero-current events in the PD. For DC disconnect, it monitors OUT current directly and triggers shutdown if load current falls below 7.5mA. Configuration is determined by OSC connection: tied to VEE enables DC mode; bypassed with 100nF capacitor enables AC mode.
Can the MAX5984AETI+T support legacy PoE devices with high signature capacitance?
Yes - the MAX5984AETI+T supports legacy PDs with signature capacitance up to 47nF when the LEGACY pin is left unconnected (internally pulled high). This enables compatibility with older 802.3af devices that exceed the standard's 10nF upper limit, while maintaining full IEEE compliance for new deployments.
What is the function of the 2-EVENT pin on the MAX5984AETI+T?
The 2-EVENT pin on the MAX5984AETI+T enables IEEE 802.3at two-event classification, required for identifying Class 5 PDs. When pulled low, it activates a second classification event after initial detection, allowing measurement of higher current signatures (>51mA) that distinguish Class 5 from Class 4. This pin must be set before device reset and remains latched during operation.
Does the MAX5984AETI+T require external components for current sensing or MOSFET drive?
No - the MAX5984AETI+T integrates both the power MOSFET (0.5Ω RDS(ON)) and current-sense resistor internally. This eliminates the need for external shunt resistors, gate drivers, or discrete FETs, reducing total solution size and component count while ensuring calibrated current-limit accuracy across temperature.
MAX5984AETI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 1
- Power - Max:
- 40 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 32V ~ 60V
- Current - Supply:
- 2.5mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX5984AETI+T FAQ
1.How can I place an order for MAX5984AETI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5984AETI+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 MAX5984AETI+T reliable?
The price and inventory of MAX5984AETI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5984AETI+T is usually 5 days.
3.What payment methods are accepted for MAX5984AETI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5984AETI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5984AETI+T?
MAX5984AETI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5984AETI+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 MAX5984AETI+T?
For technical support, including MAX5984AETI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5984AETI+T requirements.
6.How does Aetrix verify that MAX5984AETI+T is sourced from the original manufacturer or authorized distributors?
All MAX5984AETI+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 MAX5984AETI+T meets industry standards.
7.What is the process for return or replacement of MAX5984AETI+T?
All MAX5984AETI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5984AETI+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 MAX5984AETI+T part is unused and in its original packaging.
Return procedure for MAX5984AETI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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