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Analog Devices Inc./Maxim Integrated MAX5982BETE+
- Part No.:
- MAX5982BETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5982BETE+.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,816
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Product details
Overview
MAX5982BETE+ 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-operation current limit, and 100V absolute maximum input rating. It enables PoE-powered IP security cameras to safely negotiate power classification, manage wall-adapter switchover, and maintain MPS during ultra-low-power sleep.
For engineers reviewing the MAX5982BETE+ datasheet, MAX5982BETE+ pinout, MAX5982BETE+ application, or MAX5982BETE+ equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and two validated alternative parts for IEEE 802.3at PD designs requiring thermal shutdown, 2-event classification, and programmable LED indication.
Technical Context
The MAX5982BETE+ implements a dual-stage current-limit architecture: it enforces ≤182mA inrush current until RTN voltage exceeds 7V, then transitions to 1700–2100mA regulated operation with foldback protection at VRTN ≥ 7.0V. Its detection signature uses 24.9kΩ differential resistance between VDD and VSS, validated across 1.4V–10.1V input range with <10µA offset current.
It supports Type 2 PSE identification via latched 2EC output after full MOSFET turn-on, while simultaneously enabling wall-adapter detection when VWAD–VRTN > 9V. The device operates over –40°C to +125°C with 0.1Ω typical RON_ISO at +25°C and thermal shutdown at +150°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 60V operating range; withstands up to 100V absolute max - ensures robustness against PoE transients and cable drop. |
| Inrush Current Limit | ≤182mA maximum - prevents input capacitor surge damage during hot-plug events. |
| Normal Operation Current Limit | 1700–2100mA - supports Class 4/5 PD loads up to 70W with margin for thermal derating. |
| Isolation MOSFET RON | 0.1Ω typ at +25°C - minimizes conduction loss and junction heating under full load. |
| UVLO Threshold | VON = 35.4V, VOFF = 30V, hysteresis = 4.2V - rejects noise-induced false turn-off on long Ethernet cables. |
| 2-Event Classification Support | Mark threshold = 10.7V, reset threshold = 3.8V - enables IEEE 802.3at Type 2 PSE handshake compliance. |
| Sleep Mode Current | Ultra-low-power sleep enabled via ULP/SL - maintains Maintain Power Signature (MPS) while reducing system standby consumption. |
Pinout & Package
MAX5982BETE+ uses a thermally enhanced 16-pin, 5mm × 5mm TQFN package with exposed pad (EP) connected to VSS for optimal heat dissipation. Pin 1 is top-left corner (marked), EP must be soldered to a large copper 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 UVLO stability. |
| DET (Pin 3) | Detection resistor input | Accepts 24.9kΩ signature resistor to VDD - establishes IEEE-compliant 25kΩ detection impedance. |
| VSS (Pins 5,6) | Negative supply / MOSFET source | Reference for all internal circuitry and source node of integrated n-channel isolation MOSFET. |
| RTN (Pins 7,8) | MOSFET drain / power return | Connects to downstream DC-DC converter ground; voltage drop across RTN–VSS sets current limit. |
| WAD (Pin 9) | Wall adapter detector input | Detects auxiliary power when VWAD–RTN > 9V - triggers automatic switchover and disables PoE MOSFET. |
| PG (Pin 10) | Open-drain power-good output | Sinks 230µA during inrush/sleep - disables downstream DC-DC until MOSFET is fully enhanced. |
| 2EC (Pin 11) | 2-event classification detect | Latched 1.5mA sink asserted after Type 2 PSE handshake - signals compliant PSE presence to host MCU. |
| CLS (Pin 12) | Classification resistor input | Connects external RCLS to VSS to set Class 0–5 current per IEEE table - determines PSE power allocation. |
| SL (Pin 14) | Sleep mode enable | Falling edge (B version) or 6s low (A version) initiates sleep - reduces system power while maintaining MPS. |
| WK (Pin 15) | Wake mode enable | Falling edge exits sleep/ultra-low-power mode - resumes full PD operation without re-detection. |
| ULP (Pin 16) | Ultra-low-power sleep enable | Asserted low with SL enables sub-100µA sleep state - meets stringent MPS quiescent current requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 70W isolation MOSFET | RON = 0.1Ω typ eliminates need for external high-side switch and associated gate-drive complexity. |
| Two-step current limiting with foldback | 182mA inrush → 1900mA steady-state + foldback at VRTN ≥ 7.0V - protects MOSFET during overload without latch-off. |
| Programmable LED driver | 250Hz, 25% duty cycle pulses with amplitude set by RSL (10–20mA) - provides visual status without MCU GPIO overhead. |
| Thermally enhanced TQFN | θJA = 35°C/W, θJC = 2.7°C/W - enables 70W operation at +125°C ambient with minimal heatsinking. |
| Wall adapter priority logic | Automatic MOSFET disable and 2EC assertion when VWAD–RTN > 9V - enables seamless dual-source redundancy. |
Applications
| IP Security Camera | Wireless Access Node |
|---|---|
|
Use Scenario: Outdoor PoE camera with local wall adapter fallback and LED status indicator. IC Role / Device Role / Timing Role: PD interface controller managing IEEE 802.3at classification, inrush control, and wall-adapter switchover. Use Value: Enables Class 4 (25.5W) operation with 182mA inrush limit, 2EC latching for PSE type detection, and ULP sleep for battery-backed recording. |
Use Scenario: Indoor Wi-Fi 6 access point requiring thermal-safe 70W delivery and MPS maintenance. IC Role / Device Role / Timing Role: Integrated PoE front-end providing isolation MOSFET control, PG sequencing, and 2-event classification. Use Value: Delivers 1900mA continuous current with 0.1Ω RON, thermal shutdown at +150°C, and tDELAY = 96ms PG hold-off for clean DC-DC enable. |
| VoIP Phone with Status LED | Industrial IoT Gateway |
|
Use Scenario: Enterprise desk phone with blinking LED for call status and ultra-low-power sleep during idle. IC Role / Device Role / Timing Role: LED driver and sleep-mode manager co-located with PoE interface. Use Value: Drives LED at 250Hz/25% duty cycle using RSL-programmed current (10–20mA), with ULP mode sustaining MPS below 100µA. |
Use Scenario: Factory-floor gateway with redundant power sources and extended temperature operation. IC Role / Device Role / Timing Role: Robust PD controller supporting –40°C to +125°C, 100V abs max, and WAD-triggered failover. Use Value: Maintains operation across industrial ambient extremes, tolerates 100V surges, and switches to wall adapter within 100µs of detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5980ATG+ (Analog Devices) | No integrated MOSFET; requires external 70W switch; lacks ULP sleep and LED driver. | Suitable for designs needing discrete MOSFET control or lower BOM cost where LED indication is handled externally. | Select when board space allows external FET layout and ultra-low-power sleep is not required. |
| TPS23754PWPR (Texas Instruments) | Supports IEEE 802.3af only (not 802.3at); 100mA inrush limit; no 2EC output or WAD detection. | Valid for legacy Class 0–3 PDs (<15.4W); incompatible with Type 2 PSEs or wall-adapter switchover. | Choose only for cost-sensitive 802.3af-only systems without 2-event classification or auxiliary power support. |
Compared with MAX5982BETE+, MAX5980ATG+ offers flexibility with external MOSFET selection but adds layout complexity and removes ULP sleep, while TPS23754PWPR reduces feature set to meet basic af compliance at lower power - neither matches MAX5982BETE+'s integrated 70W capability, 2-event classification, or dual-source management.
Availability
MAX5982BETE+ 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 IEEE 802.3at compliance.
Supply support for MAX5982BETE+ 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, and automotive markets since 1965.
The MAX5982 family targets IEEE 802.3af/at powered devices needing integrated high-power switching, precise classification, and intelligent power-source arbitration - designed specifically for next-generation PoE endpoints demanding reliability and thermal resilience.
FAQ
What is the absolute maximum input voltage rating for MAX5982BETE+?
The MAX5982BETE+ has an absolute maximum input voltage rating of 100V across VDD to VSS. This rating ensures survivability during Ethernet cable surge events and resistive drop compensation, though its operational range is specified up to 60V. Exceeding 100V may cause permanent damage, and operation above 60V is not guaranteed per datasheet specifications. The device's wide UVLO hysteresis and deglitch timing further enhance robustness in real-world PoE deployments.
How does MAX5982BETE+ handle wall adapter detection and switchover?
MAX5982BETE+ detects wall adapter presence when the voltage between WAD and RTN exceeds 9V, triggering immediate shutdown of the internal isolation MOSFET and activation of the 2EC current sink. This enables seamless, glitch-free power source arbitration without MCU intervention. The device gives wall adapter priority and maintains MPS during switchover - critical for uninterrupted operation in dual-source PDs like enterprise VoIP phones or outdoor security cameras.
What is the function of the 2EC pin on MAX5982BETE+ and how is it used in Type 2 PSE detection?
The 2EC pin on MAX5982BETE+ serves as a latched 1.5mA current sink that asserts low after successful 2-event classification with a Type 2 PSE. It remains active until VIN drops below the reset threshold (≈3.8V), providing a reliable hardware flag for the host processor to confirm IEEE 802.3at compliance. Unlike transient classification signals, 2EC's latched behavior eliminates polling requirements and simplifies firmware integration in PoE-powered devices such as WiMAX base stations.
Does MAX5982BETE+ support ultra-low-power sleep mode, and what is its impact on MPS?
Yes, MAX5982BETE+ supports ultra-low-power sleep mode when both SL and ULP inputs are asserted - reducing quiescent current while maintaining IEEE 802.3af/at Maintain Power Signature (MPS) compliance. In this mode, the device sustains the required 10–35mA MPS current using internal timing (tMPS = 84ms enable, tMPDO = 228ms disable) without external components. This enables battery-backed or energy-harvested PoE endpoints to extend standby time without violating PSE keep-alive requirements.
What are the key thermal characteristics of MAX5982BETE+ and how do they affect high-power operation?
MAX5982BETE+ features θJA = 35°C/W and θJC = 2.7°C/W in its 5mm × 5mm TQFN package, enabling 70W operation at +125°C ambient when EP is properly soldered to a thermal plane. Its +150°C thermal-shutdown threshold with 30°C hysteresis prevents latch-up during sustained overload. These characteristics allow continuous 1900mA delivery with minimal derating - essential for high-density PoE applications like multi-radio wireless access nodes where airflow is limited.
MAX5982BETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Strip
- 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+ FAQ
1.How can I place an order for MAX5982BETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5982BETE+ 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+ reliable?
The price and inventory of MAX5982BETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5982BETE+ is usually 5 days.
3.What payment methods are accepted for MAX5982BETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5982BETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5982BETE+?
MAX5982BETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5982BETE+ 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+?
For technical support, including MAX5982BETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5982BETE+ requirements.
6.How does Aetrix verify that MAX5982BETE+ is sourced from the original manufacturer or authorized distributors?
All MAX5982BETE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5982BETE+?
All MAX5982BETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5982BETE+, 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+ part is unused and in its original packaging.
Return procedure for MAX5982BETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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