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Analog Devices Inc./Maxim Integrated MAX5971AETI+T
- Part No.:
- MAX5971AETI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX5971AETI+T.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,342
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Product details
Overview
MAX5971AETI+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 (Class 5 enabled), supporting both DC and AC load-disconnect detection, and operating across –40°C to +85°C for PoE midspan and endpoint applications in wireless access points and industrial Ethernet switches.
For engineers reviewing the MAX5971AETI+T datasheet, MAX5971AETI+T pinout, MAX5971AETI+T application, or MAX5971AETI+T equivalent, this page delivers verified technical context, exact pin functions, real-world classification thresholds (e.g., Class 5 current limit up to 950mA), thermal shutdown at 150°C, and validated alternatives for PoE PSE design validation and BOM optimization.
Technical Context
The MAX5971AETI+T implements fully autonomous PSE control logic with no firmware required, executing IEEE-compliant two-phase detection (3.8–4.2V / 9.3–9.6V probe), 2-event classification for Class 4/5 PDs, and foldback current limiting triggered below 27V (VFLBK_ST) and down to 10V (VFLBK_END). It integrates analog sensing, digital state machine sequencing, and gate drive for its internal DMOS FET.
Its architecture supports dual disconnect modes: DC disconnect via OUTP/OUT voltage monitoring and AC disconnect via OSC-generated triangular wave (4Vpp) applied to DET through external RC network, enabling zero-current detection with 130µA threshold (IACTH). All critical thresholds-including UVLO (28.5V), OVLO (62.5V), and overtemperature (150°C)-are internally monitored and latched.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Standard Compliance | IEEE 802.3af/at compliant; supports full legacy PD detection and Class 5 high-power mode. |
| Max Output Power | 40W per port (Class 5 enabled); requires VAGND–VEE ≥ 54V and ILIM1/ILIM2 configured for 900mA limit. |
| Integrated FET RDS(ON) | 0.5Ω typical at +25°C; enables compact single-chip PSE design without external switch. |
| Current Limit Range | 420mA (Class 0–3) to 950mA (Class 5, ILIM1=VEE, ILIM2=VEE); programmable via two digital inputs. |
| DC Load-Disconnect Threshold | 7.5mA minimum load current (IDCTH); triggers port shutdown if sustained below threshold. |
| AC Disconnect Sensitivity | 130µA IDET threshold (IACTH); detects zero-current condition using OSC-driven AC signal. |
| Operating Temperature | –40°C to +85°C; qualified for industrial Ethernet infrastructure and outdoor WiMAX base stations. |
Pinout & Package
MAX5971AETI+T is housed in a 28-pin TQFN-EP (5mm × 5mm) package with exposed pad connected to VEE. The package supports high thermal dissipation (θJA = 29°C/W) and is RoHS-compliant (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,3,8–11,15 | VEE | Analog low-side supply return; all must be connected to system ground plane via low-inductance path. |
| 4,5 | ILIM1 / ILIM2 | Digital configuration inputs for Class 5 current limit selection; pulled up internally, tied to VEE to set specific thresholds. |
| 6 | PWMEN | LED PWM enable/disable control; unconnected enables blinking status indication per port state. |
| 7,13,14 | MIDSPAN / LEGACY / EN | Mode-select latched inputs; MIDSPAN high enables cadence timing for midspan systems; EN low >40µs resets device. |
| 17 | LED | Open-drain LED driver output; sinks up to 10mA; signals port status (on/off/blinking) without external transistor. |
| 19 | OSC | AC disconnect triangular wave generator (4Vpp); requires 100nF capacitor to VEE to activate AC sensing. |
| 21 | AGND | High-side supply input reference; connects to PoE power rail (32–60V); bypassed with 47µF + 0.1µF capacitors. |
| 23 | DET | Detection/classification voltage node; sources probe voltages and senses AC current via external RC network. |
| 25 | OUTP | Port pullup output; drives AC-blocking diode anode when AC disconnect is active; ties to OUT for DC mode. |
| 26,27 | OUT | Integrated MOSFET drain output; connects to cathode of AC-blocking diode or directly to port in DC mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5Ω DMOS FET + sense resistor | Eliminates need for external power switch and current-sense shunt, reducing BOM count and PCB area by ≥3 components. |
| 2-event classification for Class 4/5 PDs | Enables reliable identification of high-power devices (e.g., PTZ cameras, thin clients) without false positives or missed classification. |
| Programmable Class 5 current limit (850–950mA) | Allows precise matching to PD power requirements while maintaining margin against overcurrent faults during startup surge. |
| High-capacitance legacy PD detection (up to 47µF) | Supports older PoE devices with large input capacitance without false open-circuit detection or timeout failures. |
| Direct fast-shutdown control via EN pin | Hardware reset in <40µs enables rapid fault recovery or coordinated multi-port shutdown in switch fabric designs. |
Applications
| Wireless LAN Access Point | Industrial Ethernet Switch |
|---|---|
Use Scenario: Powering 802.11ac/ax APs with integrated radios, RF amplifiers, and backhaul interfaces over single Ethernet cable. IC Role / Device Role / Timing Role: Single-port PSE controller managing discovery, classification, and 40W power delivery with AC disconnect for hot-swap safety. Use Value: Enables fanless, sealed enclosure design by eliminating external MOSFETs and reducing thermal footprint via integrated 0.5Ω FET. |
Use Scenario: Providing PoE to field I/O modules, PLC gateways, and HMI terminals in factory automation networks. IC Role / Device Role / Timing Role: Robust PSE controller with –40°C to +85°C operation, UVLO/OVLO protection, and thermal shutdown for uncontrolled environments. Use Value: Ensures continuous uptime via high-capacitance detection for legacy sensors and foldback current limiting during motor startup surges. |
| WiMAX Base Station | Midspan Power Injector |
Use Scenario: Delivering primary power to outdoor WiMAX subscriber units mounted on poles or rooftops. IC Role / Device Role / Timing Role: Midspan-mode PSE controller using cadence timing (2.2s retry delay) to avoid detection collisions in multi-PSE deployments. Use Value: Prevents network-wide detection conflicts in dense deployments while maintaining IEEE compliance and 40W capability. |
Use Scenario: Adding PoE capability to non-PoE network switches via inline power injection between switch and endpoint. IC Role / Device Role / Timing Role: Standalone PSE controller with integrated FET and automatic detection/classification, requiring no host MCU coordination. Use Value: Reduces bill-of-materials and layout complexity versus discrete controller + MOSFET solutions, accelerating time-to-market. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5972AETI+ | Same 28-pin TQFN package and pinout; supports only up to Class 4 (30W), no Class 5 mode or 2-event classification. | Limited to legacy 802.3af/at applications requiring ≤30W; lacks high-power PD support. | Select MAX5972AETI+ only if Class 5 capability and 40W delivery are not required-reduces cost and simplifies configuration. |
| TPS23753APWR | TI part in 20-pin TSSOP; external MOSFET required; supports Class 4 only; no integrated sense resistor or AC disconnect. | Requires additional external components (FET, shunt, RC network); higher layout complexity and thermal management burden. | Choose TPS23753APWR only when leveraging TI's ecosystem or needing TSSOP compatibility; MAX5971AETI+ offers superior integration. |
Compared with MAX5972AETI+, MAX5971AETI+ adds Class 5 support and 2-event classification for future-proofing; versus TPS23753APWR, it reduces component count by integrating FET, sense resistor, and AC disconnect generator-cutting PCB area and qualification effort.
Availability
MAX5971AETI+T is available at Aetrix Electronics and suitable for wireless access point development, industrial Ethernet switch production, and midspan power injector manufacturing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX5971AETI+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 demanding industrial, communications, and computing applications.
The MAX5971AETI+T belongs to Maxim's PoE PSE controller product line, engineered specifically for single-port, high-efficiency, fully autonomous IEEE 802.3af/at power delivery in space-constrained infrastructure equipment.
FAQ
What is the maximum power delivery capability of the MAX5971AETI+T?
The MAX5971AETI+T delivers up to 40W per port when configured for IEEE 802.3at Class 5 operation. This requires VAGND–VEE ≥ 54V, ILIM1 and ILIM2 tied to VEE to set the 950mA current limit, and proper thermal management. At lower input voltages or Class 4 settings, output power drops to 30W. The MAX5971AETI+T maintains full 802.3af/at compliance across all modes.
Does the MAX5971AETI+T require external firmware or microcontroller support?
No, the MAX5971AETI+T operates autonomously without any software programming. Its internal state machine handles IEEE-compliant detection, classification (including 2-event for Class 4/5), current limiting, and disconnect monitoring. Configuration is done solely via hardware pins (ILIM1, ILIM2, MIDSPAN, LEGACY), making it ideal for cost-sensitive, MCU-free PSE designs.
How does the MAX5971AETI+T implement AC versus DC load-disconnect detection?
The MAX5971AETI+T uses OSC to generate a 4Vpp triangular wave applied to DET via external RC network for AC disconnect, detecting zero-current conditions at 130µA (IACTH). For DC disconnect, it monitors OUTP/OUT voltage drop and triggers shutdown if load current falls below 7.5mA (IDCTH) for >400ms. Mode selection is hardware-configured via OSC connection.
What is the function of the ILIM1 and ILIM2 pins on the MAX5971AETI+T?
ILIM1 and ILIM2 are digital inputs that configure the MAX5971AETI+T's Class 5 current limit and overcurrent thresholds. When both are unconnected, Class 5 is disabled and the device defaults to IEEE 802.3at Class 4 (≤30W). Connecting either or both to VEE selects one of three Class 5 limits: 850mA, 900mA, or 950mA-enabling precise power matching to high-power PDs.
Can the MAX5971AETI+T support legacy PoE devices with high input capacitance?
Yes, the MAX5971AETI+T supports legacy PDs with input capacitance up to 47µF (typical) when the LEGACY pin is left unconnected (internally pulled high). This extends detection window and prevents false open-circuit detection caused by slow capacitor charging. For standard PDs, tie LEGACY to VEE to disable this mode and reduce detection time.
MAX5971AETI+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)
MAX5971AETI+T FAQ
1.How can I place an order for MAX5971AETI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5971AETI+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 MAX5971AETI+T reliable?
The price and inventory of MAX5971AETI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5971AETI+T is usually 5 days.
3.What payment methods are accepted for MAX5971AETI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5971AETI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5971AETI+T?
MAX5971AETI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5971AETI+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 MAX5971AETI+T?
For technical support, including MAX5971AETI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5971AETI+T requirements.
6.How does Aetrix verify that MAX5971AETI+T is sourced from the original manufacturer or authorized distributors?
All MAX5971AETI+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 MAX5971AETI+T meets industry standards.
7.What is the process for return or replacement of MAX5971AETI+T?
All MAX5971AETI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5971AETI+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 MAX5971AETI+T part is unused and in its original packaging.
Return procedure for MAX5971AETI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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