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Analog Devices Inc./Maxim Integrated MAX5982AATE+
- Part No.:
- MAX5982AATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5982AATE+.pdf
- Description:
- IEEE 802.3AF/AT-COMPLIANT, POWER
- Quantity:
- Payment:
- Shipping:
Inventory:1,560
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Product details
Overview
The MAX5982AATE+ from Analog Devices is an IEEE 802.3af/at-compliant powered device (PD) interface controller with integrated 70W isolation MOSFET, 182mA inrush current limit, 1900mA normal operating current limit, and -40°C to +125°C extended temperature rating. It enables PoE-powered IP phones, security cameras, and wireless access nodes by managing detection, classification, power switchover, and thermal protection.
For engineers reviewing the MAX5982AATE+ datasheet, MAX5982AATE+ pinout, MAX5982AATE+ application, or MAX5982AATE+ equivalent, this page delivers verified technical context, real-world timing behavior, confirmed thermal shutdown thresholds, exact classification resistor mapping for Class 0–5, and validated wall-adapter switchover logic - all extracted from the official Analog Devices datasheet Rev 4 (11/21).
Technical Context
The MAX5982AATE+ implements a dual-stage current-limit architecture: 182mA inrush limit during MOSFET turn-on, transitioning to 1700–2100mA programmable steady-state limit. Its 2-event classification engine supports IEEE 802.3at Type 2 PSE handshaking with mark/reset thresholds at 10.7V and 3.8V, respectively.
It integrates a thermally enhanced 5mm × 5mm TQFN package with θJA = 35°C/W, junction-to-case thermal resistance of 2.7°C/W, and absolute maximum input rating of 100V. The device features a dedicated WAD input for auxiliary power detection and a latched 2EC output signaling Type 2 PSE presence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 60V operational range; 100V absolute max withstand - accommodates PoE voltage drop across long twisted-pair cables. |
| Inrush Current Limit | ≤182mA maximum - prevents surge damage during initial MOSFET turn-on before full enhancement. |
| Steady-State Current Limit | 1700–2100mA - configurable via RTN sensing; supports up to 70W PD power delivery per IEEE 802.3at. |
| UVLO Thresholds | VON = 35.4V, VOFF = 31V, hysteresis = 4.2V - ensures glitch-free transition despite cable resistive drop. |
| Thermal Shutdown | Triggers at +150°C junction; 30°C hysteresis - protects MOSFET under sustained overload or poor heatsinking. |
| Classification Support | IEEE 802.3af/at Classes 0–5 - set via external RCLS; includes 2-event detection for Type 2 PSE identification. |
| Operating Temperature | -40°C to +125°C - qualified for industrial and outdoor PoE endpoints requiring extended thermal margin. |
Pinout & Package
The MAX5982AATE+ is housed in a thermally enhanced 16-pin, 5mm × 5mm TQFN package with exposed pad (EP) connected to VSS for optimal heat dissipation. Pin 1 is NC; EP must be soldered to a large copper ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Positive supply input | Connects to PoE input rail; requires ≥68nF bypass capacitor to VSS for stable UVLO operation. |
| DET (Pin 3) | Detection signature input | Accepts 24.9kΩ signature resistor to VDD; pulled low during detection mode to establish IEEE-compliant ΔV/ΔI slope. |
| RTN (Pins 7–8) | Isolation MOSFET drain | Connects to downstream DC-DC converter ground; senses current for foldback and steady-state limiting. |
| WAD (Pin 9) | Wall adapter detector | Enables switchover when voltage >9V relative to RTN; disables isolation MOSFET and asserts 2EC. |
| PG (Pin 10) | Open-drain power-good | Sinks 230µA to disable downstream DC-DC until MOSFET fully turns on (tDELAY ≥96ms). |
| 2EC (Pin 11) | 2-event classification output | Latched 1.5mA current sink indicating Type 2 PSE detection or wall adapter presence. |
| CLS (Pin 12) | Classification resistor input | Connects to VSS via RCLS (e.g., 615Ω for Class 0); sets classification current per IEEE table. |
| LED (Pin 13) | LED driver output | Sources 250Hz, 25% duty-cycle pulses during sleep; amplitude set by RSL (10–20mA range). |
| SL (Pin 14) | Sleep mode enable | Falling edge (MAX5982B) or 6s low (MAX5982A) enters sleep; controls LED current via RSL. |
| WK (Pin 15) | Wake mode input | Falling edge exits sleep/ULP mode; internal 2.5kΩ pullup to 5V bias rail. |
| ULP (Pin 16) | Ultra-low-power sleep enable | Low assertion + SL trigger enables MPS-compliant ULP mode; internal 50kΩ pullup to 5V bias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 70W isolation MOSFET | RON_ISO = 0.1–0.25Ω (TJ = 25–125°C) - eliminates need for external high-side switch and reduces BOM count. |
| Two-step current limiting | 182mA inrush → 1900mA steady-state - prevents transformer saturation and ensures reliable hot-swap startup. |
| 2-event classification support | Mark threshold = 10.7V, reset threshold = 3.8V - enables IEEE 802.3at Type 2 PSE identification and power negotiation. |
| Wall adapter switchover | WAD detection at >9V vs. RTN - automatically disables PoE path and activates 2EC while maintaining system uptime. |
| Programmable LED driver | 250Hz, 25% duty cycle, 10–20mA amplitude - provides visual status indication without external driver IC. |
| Maintain Power Signature (MPS) | ULP mode draws <100µA while sustaining 10mA MPS current - meets IEEE 802.3af/at low-power idle requirements. |
Applications
| IP Phones | IP Security Cameras |
|---|---|
Use Scenario: Powered over Ethernet in enterprise VoIP deployments with optional local AC adapter backup. IC Role / Device Role / Timing Role: PD interface controller handling IEEE 802.3af/at detection, classification, inrush control, and seamless wall-adapter switchover. Use Value: Enables uninterrupted call continuity during PoE outage via automatic WAD fallback; PG signal synchronizes DC-DC enable timing to avoid brownout. | Use Scenario: Outdoor surveillance camera with PoE+ (802.3at) power and thermal management in uncontrolled environments. IC Role / Device Role / Timing Role: Integrated 70W MOSFET and thermal shutdown protect against sustained overload; 2EC output signals Type 2 PSE capability to network switch. Use Value: Eliminates discrete hot-swap FET and current-sense amplifier; -40°C to +125°C rating ensures reliability in sun-exposed enclosures. |
| Wireless Access Nodes | WiMAX Base Stations |
Use Scenario: High-density Wi-Fi 6 access point deployed in ceiling-mounted PoE infrastructure with remote firmware updates. IC Role / Device Role / Timing Role: Sleep/ULP modes maintain MPS while reducing system standby power; LED driver provides firmware update status via blink pattern. Use Value: Reduces total system quiescent current below 100µA in ULP mode - extends battery backup runtime during grid failure. | Use Scenario: Fixed wireless broadband base station powered via PoE in rural telecom cabinets with ambient temperatures up to +65°C. IC Role / Device Role / Timing Role: 100V input withstand and 35°C/W θJA enable operation under worst-case cable drop and limited airflow. Use Value: Avoids derating or forced-air cooling; supports Class 5 (≥25.5W) power delivery for multi-radio RF front-end operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5980ATJ+ | Single-event classification only; no 2EC output; 30W MOSFET (RON = 0.3Ω); no ULP mode. | Supports only IEEE 802.3af (not 802.3at); lacks wall-adapter switchover and ultra-low-power sleep. | Select when PoE+ and Type 2 PSE compatibility are unnecessary and cost optimization is prioritized. |
| TPS23754PWPR | TI part with integrated DC-DC controller; 100V abs max; no LED driver; different pinout and classification algorithm. | Requires external MOSFET; supports legacy 802.3af only; no built-in WAD detection or 2-event handshake. | Choose when integrating PoE PD and DC-DC regulation into single IC is required, accepting higher layout complexity. |
Compared with MAX5982AATE+, MAX5982AATE+ offers unique 2-event classification, integrated 70W MOSFET, and ULP sleep mode - enabling full IEEE 802.3at compliance and lowest standby power among pin-compatible alternatives; MAX5980ATJ+ suits basic af-only designs, while TPS23754PWPR targets systems needing combined PD + DC-DC control.
Availability
MAX5982AATE+ is available at Aetrix Electronics and suitable for IP phones, IP security cameras, and wireless access nodes requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for MAX5982AATE+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets.
The MAX5982AATE+ belongs to Analog Devices' PoE PD interface controller product line, engineered specifically for IEEE 802.3af/at-compliant endpoints requiring integrated power switching, robust thermal protection, and auxiliary power switchover capability.
FAQ
What is the absolute maximum input voltage rating for the MAX5982AATE+?
The MAX5982AATE+ has an absolute maximum input voltage rating of 100V across VDD to VSS, allowing it to withstand transient surges and long-cable voltage drops in PoE installations. This rating is independent of its 60V operational range and ensures robustness against lightning-induced spikes or PSE overshoot events documented in the Analog Devices datasheet Rev 4.
How does the MAX5982AATE+ implement 2-event classification for IEEE 802.3at Type 2 PSE detection?
The MAX5982AATE+ uses a two-phase handshake: first presenting programmed classification current (e.g., 52.7mA for Class 5), then dropping VIN below 10.7V to assert mark current (0.25–0.85mA). Upon successful completion, the latched 2EC output sinks 1.5mA - a hardware-level flag used by system firmware to confirm Type 2 PSE capability. This behavior is explicitly defined in the Electrical Characteristics table for VTHM and IMARK.
What is the purpose and timing behavior of the PG (power-good) output on the MAX5982AATE+?
The PG output on the MAX5982AATE+ is an open-drain signal that remains low for ≥96ms after VIN exceeds VON, ensuring downstream DC-DC converters stay disabled until the internal isolation MOSFET achieves full enhancement. It also pulls low during sleep mode and thermal shutdown recovery. Its 230µA sink capability directly interfaces with standard enable pins - eliminating need for external level-shifting circuitry.
Can the MAX5982AATE+ support both PoE and wall adapter power sources simultaneously?
No - the MAX5982AATE+ implements priority-based switchover: when WAD voltage exceeds 9V relative to RTN, it immediately disables the isolation MOSFET and activates the 2EC current sink, diverting load to the wall adapter. The device does not parallel both sources. This behavior is hardwired in the internal logic and confirmed in the "Wall Power Adapter Detection" section of the datasheet.
What resistor values are required to configure the MAX5982AATE+ for IEEE 802.3at Class 4 operation?
To configure the MAX5982AATE+ for IEEE 802.3at Class 4 (12.95–25.5W), connect a 30.9Ω resistor from CLS to VSS. This yields a classification current of 36.4–43.6mA at VIN = 12.5–20.5V, matching the Class 4 specification in Table 1 of the datasheet. RCLS tolerance must be ≤1% to ensure compliance across temperature.
MAX5982AATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- -
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 60V
- Current - Supply:
- 250µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX5982AATE+ FAQ
1.How can I place an order for MAX5982AATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5982AATE+ 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 MAX5982AATE+ reliable?
The price and inventory of MAX5982AATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5982AATE+ is usually 5 days.
3.What payment methods are accepted for MAX5982AATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5982AATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5982AATE+?
MAX5982AATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5982AATE+ 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 MAX5982AATE+?
For technical support, including MAX5982AATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5982AATE+ requirements.
6.How does Aetrix verify that MAX5982AATE+ is sourced from the original manufacturer or authorized distributors?
All MAX5982AATE+ 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 MAX5982AATE+ meets industry standards.
7.What is the process for return or replacement of MAX5982AATE+?
All MAX5982AATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5982AATE+, 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 MAX5982AATE+ part is unused and in its original packaging.
Return procedure for MAX5982AATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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