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Analog Devices Inc./Maxim Integrated MAX5982BETE+T
- Part No.:
- MAX5982BETE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5982BETE+T.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
MAX5982BETE+T 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 security cameras and wireless access nodes to safely negotiate power classification, manage wall-adapter switchover, and maintain MPS during ultra-low-power sleep.
For engineers reviewing the MAX5982BETE+T datasheet, MAX5982BETE+T pinout, MAX5982BETE+T application, or MAX5982BETE+T equivalent, key selection criteria include its 2-event classification support, 100V absolute maximum input rating, dual sleep modes with LED driver, and TQFN-16 (5mm × 5mm) thermally enhanced package for high-density PoE endpoint designs.
Technical Context
The MAX5982BETE+T implements a two-stage power sequencing architecture: first enforcing 182mA inrush current control until RTN voltage stabilizes near VSS, then transitioning to 1700–2100mA regulated current limit with foldback protection. Its detection circuitry uses differential input resistance (23.95–25.50kΩ) and <10µA offset current to satisfy IEEE 802.3af signature requirements across 1.4–10.1V input range.
Classification operates via external RCLS resistor (e.g., 615Ω for Class 0), delivering precise current steps (0–63.3mA) over 12.6–20.5V; Type 2 PSE interaction is confirmed by 2EC latched output after mark/reset events, while WAD input enables seamless wall-adapter priority switchover above 9V relative to RTN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Operates from 34.3V turn-on to 60V max; supports PoE+ (802.3at) with 100V absolute max rating for surge robustness. |
| Inrush Current Limit | 182mA max during initial turn-on; prevents cable/connector stress and ensures reliable hot-swap into live PSE ports. |
| Normal Operation Current Limit | 1900mA typical (1700–2100mA range); delivers up to 70W at 48V after inrush completion. |
| Classification Support | IEEE 802.3af/at Classes 0–5 via RCLS resistor; includes 2-event classification for Type 2 PSE identification. |
| Sleep Modes | Normal and ultra-low-power sleep with MPS maintenance; SL input controls entry, WK triggers wake, ULP enables ultra-low mode. |
| Thermal Protection | Thermal shutdown at +150°C with +30°C hysteresis; automatically recovers through inrush sequence upon cooling. |
| Package | 16-pin TQFN (5mm × 5mm, exposed pad); θJA = 35°C/W enables high-power dissipation in compact layouts. |
Pinout & Package
MAX5982BETE+T uses a thermally enhanced 16-pin TQFN package (5mm × 5mm) with exposed pad connected to VSS for optimal heat transfer. The pinout is validated per Analog Devices' official pin description and schematic guidance.
| 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 resistor input | Accepts 24.9kΩ signature resistor to VDD; pulled low in detection mode to establish IEEE-compliant ΔV/ΔI slope. |
| VSS (Pins 5,6) | Negative supply / MOSFET source | Reference for all internal circuitry; ties directly to source of integrated 0.1–0.25Ω isolation MOSFET. |
| RTN (Pins 7,8) | MOSFET drain / power return | Drain node of internal high-power switch; connects to downstream DC-DC converter ground for isolated power delivery. |
| WAD (Pin 9) | Wall adapter detector | Enables auxiliary power priority: asserts when voltage >9V between WAD and RTN, disabling MOSFET and enabling 2EC sink. |
| PG (Pin 10) | Open-drain power-good | Sinks 230µA to disable downstream DC-DC during inrush (≥96ms delay) and sleep mode. |
| 2EC (Pin 11) | 2-event classification detect | Latched 1.5mA current sink indicating Type 2 PSE presence or wall adapter detection; resets only below VTHR. |
| CLS (Pin 12) | Classification resistor input | Connects external RCLS (e.g., 615Ω) to VSS to set PD class; determines classification current per IEEE table. |
| SL (Pin 14) | Sleep mode enable | Falling edge (MAX5982B) or 6s low hold (MAX5982A) initiates sleep; also sets LED current amplitude via RSL. |
| WK (Pin 15) | Wake mode enable | Falling edge exits sleep/ultra-low-power mode; internal 2.5kΩ pullup ensures default wake state. |
| ULP (Pin 16) | Ultra-low-power sleep enable | Pulled high via 50kΩ resistor; must be low during SL assertion to activate ultra-low-power mode with MPS. |
| LED (Pin 13) | LED driver output | Sources 250Hz, 25% duty cycle pulses during sleep; amplitude programmable 10–20mA via RSL formula. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 70W isolation MOSFET | RON_ISO = 0.1–0.25Ω across -40°C to +125°C; eliminates need for external high-side switch and reduces BOM count. |
| Two-stage current limiting | 182mA inrush limit transitions to 1900mA operating limit with foldback (53mA at 7.5V RTN) for overload safety. |
| 2-event classification with latched 2EC | Confirms Type 2 PSE compatibility and provides system-level status flag for firmware-driven power management decisions. |
| Wall adapter priority switchover | Automatic MOSFET disable and 2EC activation when WAD-to-RTN >9V; enables seamless fallback to auxiliary power without microcontroller intervention. |
| Ultra-low-power sleep with MPS | Reduces quiescent current while maintaining IEEE-mandated 10mA minimum signature current for uninterrupted PoE link presence. |
Applications
| IP Security Camera | Wireless Access Node |
|---|---|
Use Scenario: Outdoor PoE-powered camera with motion-triggered recording and night vision IR LEDs. IC Role / Device Role / Timing Role: PD interface controller managing PoE negotiation, inrush control, wall-adapter fallback, and sleep-mode MPS maintenance. Use Value: Enables reliable 70W power delivery for IR illumination and video processing while supporting ultra-low-power sleep during idle periods to meet energy standards. | Use Scenario: Dual-band Wi-Fi 6 access point deployed in enterprise ceiling mounts with PoE+ uplink. IC Role / Device Role / Timing Role: Powered device controller handling 802.3at classification, thermal shutdown coordination, and PG-controlled DC-DC sequencing. Use Value: Guarantees safe inrush current (<182mA) into legacy PoE infrastructure while delivering full 70W for high-throughput RF subsystems. |
| VoIP Phone Endpoint | Industrial IoT Gateway |
Use Scenario: Enterprise desk phone with PoE-powered speaker, microphone, and display backlight. IC Role / Device Role / Timing Role: PD interface managing classification (Class 2), PG-controlled power-up timing, and LED driver for status indication. Use Value: Integrates LED driver with programmable current (10–20mA) and 250Hz blinking-eliminating discrete LED circuitry and reducing layout area. | Use Scenario: Factory-floor gateway aggregating sensor data via RS-485 and Ethernet, powered solely by PoE+. IC Role / Device Role / Timing Role: Robust PD controller with 100V abs max rating, wide UVLO hysteresis (4.2V), and 30µs deglitching for noisy industrial environments. Use Value: Withstands cable voltage drop and EMI-induced glitches without false UVLO trips, ensuring continuous operation in electrically harsh settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5982AETE+T | Identical pinout and core functionality; includes same LED driver, SL/WK/ULP logic, and 2EC output-but rated for -40°C to +85°C (vs. +125°C for MAX5982BETE+T). | Not suitable for under-hood automotive or high-ambient industrial enclosures requiring extended temperature operation. | Select MAX5982AETE+T only when ambient temperature remains ≤+85°C and cost sensitivity outweighs thermal margin needs. |
| LT4275AIMSE#TRPBF | Linear Technology/Analog Devices 802.3at PD controller with 100V abs max, but lacks integrated MOSFET-requires external switch-and has no ULP sleep mode or LED driver. | Demands additional FET, gate driver, and LED circuitry; increases board area and design complexity versus single-chip MAX5982BETE+T solution. | Choose LT4275AIMSE#TRPBF only when discrete MOSFET selection is required for custom RDS(on) or thermal partitioning. |
Compared with MAX5982AETE+T, MAX5982BETE+T extends junction temperature capability to +125°C for harsh environments, while LT4275AIMSE#TRPBF trades integration for flexibility-requiring external components but offering different fault-handling timing and I²C configurability not present in the MAX5982 series.
Availability
MAX5982BETE+T is available at Aetrix Electronics and suitable for IP security cameras, wireless access nodes, and industrial IoT gateways requiring stable component supply, extended temperature operation, and full IEEE 802.3af/at compliance.
Supply support for MAX5982BETE+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The MAX5982 family is designed specifically for IEEE 802.3af/at powered devices, integrating detection, classification, power switching, and sleep management into a single thermally optimized package for space-constrained PoE endpoints.
FAQ
What is the absolute maximum input voltage rating for MAX5982BETE+T?
The MAX5982BETE+T has an absolute maximum input voltage rating of 100V across VDD to VSS, providing robust surge tolerance beyond standard PoE+ (802.3at) 57V limits. This rating protects against transient overvoltages on twisted-pair cabling and ensures reliability in electrically noisy environments. The device operates continuously up to 60V, with UVLO turn-on at 35.4V and turn-off at 31V. MAX5982BETE+T's wide hysteresis and 120µs deglitch time further enhance immunity to cable-resistive drop and power-on/off transients.
How does MAX5982BETE+T support wall adapter switchover?
MAX5982BETE+T detects wall adapter presence via the WAD pin: when voltage between WAD and RTN exceeds 9V, it disables the internal isolation MOSFET, activates the 2EC current sink, and disables classification current. This enables automatic, glitch-free power source transition without microcontroller involvement. The device gives wall adapter priority over PoE, ensuring continuous operation during PoE interruption. MAX5982BETE+T maintains this behavior across its full -40°C to +125°C operating range, making it suitable for outdoor or industrial deployments where auxiliary power backup is critical.
What are the key differences between MAX5982BETE+T and MAX5982AETE+T?
MAX5982BETE+T and MAX5982AETE+T share identical pinout, feature set, and electrical specifications except for temperature rating: MAX5982BETE+T is specified from -40°C to +125°C, while MAX5982AETE+T is rated only to +85°C. Both include LED driver, SL/WK/ULP sleep controls, and 2EC output. The higher temperature grade of MAX5982BETE+T enables use in under-hood automotive, factory-floor, or enclosed outdoor applications where ambient temperatures exceed +85°C. MAX5982BETE+T retains full functionality-including MPS maintenance and thermal shutdown-at its extended upper limit.
Does MAX5982BETE+T support IEEE 802.3bt (PoE++)?
No, MAX5982BETE+T is explicitly designed for IEEE 802.3af (PoE) and 802.3at (PoE+) compliance only. It does not support 802.3bt's higher power classes (Type 3/4), autoclass, or multi-event classification. Its classification current range (0–63.3mA) and 70W power delivery ceiling align with 802.3at Class 5, not 802.3bt's 90W+ capabilities. For 802.3bt designs, Analog Devices offers the MAX5984/MAX5985 families. MAX5982BETE+T remains ideal for cost-sensitive, thermally demanding 802.3af/at endpoints where backward compatibility and extended temperature operation are priorities.
How is the LED current programmed on MAX5982BETE+T?
The LED current on MAX5982BETE+T is programmed using an external resistor RSL connected between SL and VSS, following the formula ILED (A) = 645.75 / (RSL + 1200). Typical values yield 10–20mA: RSL = 60.4kΩ gives 10.5mA, RSL = 30.2kΩ gives 20.9mA. The LED driver operates only during sleep/ultra-low-power modes, pulsing at 250Hz with 25% duty cycle. This integrated function eliminates discrete LED drive circuitry. MAX5982BETE+T's SL pin serves dual purpose-enabling sleep mode and setting LED amplitude-streamlining design and reducing component count.
MAX5982BETE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 70 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 36.6V ~ 60V
- Current - Supply:
- 250µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX5982BETE+T FAQ
1.How can I place an order for MAX5982BETE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5982BETE+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 MAX5982BETE+T reliable?
The price and inventory of MAX5982BETE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5982BETE+T is usually 5 days.
3.What payment methods are accepted for MAX5982BETE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5982BETE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5982BETE+T?
MAX5982BETE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5982BETE+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 MAX5982BETE+T?
For technical support, including MAX5982BETE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5982BETE+T requirements.
6.How does Aetrix verify that MAX5982BETE+T is sourced from the original manufacturer or authorized distributors?
All MAX5982BETE+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 MAX5982BETE+T meets industry standards.
7.What is the process for return or replacement of MAX5982BETE+T?
All MAX5982BETE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5982BETE+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 MAX5982BETE+T part is unused and in its original packaging.
Return procedure for MAX5982BETE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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