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Analog Devices Inc./Maxim Integrated MAX5986AETE+T
- Part No.:
- MAX5986AETE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5986AETE+T.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,164
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Product details
Overview
MAX5986AETE+T from Maxim Integrated is an IEEE 802.3af-compliant Class 1/Class 2 Powered Device (PD) IC with integrated DC-DC buck converter, supporting 3.0V–5.6V programmable output, 8.7V–60V input range, and fixed 215kHz switching frequency. It delivers up to 6.49W input power and features sleep/ultra-low-power modes for PoE-powered IP phones and security cameras.
For engineers reviewing the MAX5986AETE+T datasheet, MAX5986AETE+T pinout, MAX5986AETE+T application, or MAX5986AETE+T equivalent, key selection criteria include PoE classification signature configuration, inrush current limit (49mA typ), MPS compliance timing (tMPS_HIGH = 95ms), and thermal performance (θJA = 35°C/W) in the 5mm × 5mm TQFN package.
Technical Context
The MAX5986AETE+T integrates a complete IEEE 802.3af PD interface-including detection signature (24.9kΩ resistor-based), Class 1/2 classification, Maintain Power Signature (MPS) with 4.8mA average current, and hiccup-mode current limiting-with a peak-current-mode controlled step-down DC-DC converter.
It operates across three voltage-defined modes: detection (1.4V–10.1V), classification (12.6V–20V), and power mode (>35.7V VON), with UVLO hysteresis of 4.2V and 150µs deglitch time to tolerate cable resistive drop and ensure glitch-free transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.7V to 60V - supports full PoE voltage envelope including worst-case cable drop at PSE output. |
| Output Voltage Range | 3.0V to 5.6V - adjustable via FB resistive divider; enables direct 3.3V or 5V rail generation for baseband processors. |
| Switching Frequency | Fixed 215kHz - balances EMI, efficiency, and external component size; includes frequency foldback to 107.5kHz at light loads. |
| Inrush Current Limit | 49mA (typ) - limits surge during initial VDD ramp-up, preventing PSE shutdown and enabling reliable hot-plug operation. |
| Classification Current | 10.5mA (Class 1) or 18.0mA (Class 2) - set by single RSIG = 24.9kΩ + CLASS2 pin logic; fully compliant with IEEE 802.3af Table 33. |
| Thermal Resistance | θJA = 35°C/W - enables >2.2W continuous dissipation at TA = +70°C in standard 4-layer PCB layout with exposed pad grounded. |
| MPS Timing | tMPS_HIGH = 95ms, tMPS_LOW = 190ms - meets IEEE 802.3af §33.3.2.2.3 requirement for maintain power signature duty cycle and pulse width. |
Pinout & Package
MAX5986AETE+T is housed in a 16-pin, 5mm × 5mm, 0.5mm pitch TQFN package with exposed pad (EP) connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AUX) | Auxiliary voltage input | Back-bias path for internal circuitry when VOUT ≥ 4.75V; improves light-load efficiency by powering bias rails from output. |
| 2 (LX) | Inductor switch node | Connection point for external buck inductor; handles peak currents up to 1.6A RMS and supports synchronous rectification via internal MOSFETs. |
| 5 (FB) | DC-DC feedback input | High-impedance (10–200nA) input referenced to GND; regulates output using 1.225V internal reference and external resistor divider. |
| 6 (GND) | Analog ground reference | "Quiet" ground for FB, VDRV, and internal references; must be star-connected separately from PGND to avoid noise coupling. |
| 7 (VDRV) | Internal 5V regulator output | Supplies gate drive and internal logic; not for external loading; requires 1µF bypass capacitor to GND. |
| 10 (CLASS2) | Class selection control | Logic-level input: tied to GND for Class 1 (10.5mA), to VDRV for Class 2 (18.0mA); sets maximum PSE power allocation. |
| 13 (VDD) | PoE input supply | Main PD interface input; accepts 8.7–60V; connects to isolation MOSFET source; requires 68nF bypass to PGND. |
| 14 (VCC) | DC-DC input supply | Output of internal isolation MOSFET; powers buck stage; requires 10µF + 1µF parallel ceramic bypass to PGND. |
| 15 (PGND) | Power ground | High-current return path for LX and buck stage; must be routed separately from analog GND and joined at single point. |
| 16 (RREF) | Signature resistor connection | Connects to 24.9kΩ resistor to GND; establishes detection resistance (25.5kΩ typ) and classification current sink path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated TVS diode | Withstands 2kV CAT-6 cable discharge event (CDE) without external protection, reducing BOM count and board area. |
| Sleep & ultra-low-power modes | Reduces quiescent current to <12mA in sleep mode and further in ULP mode while maintaining MPS compliance for standby PoE operation. |
| Programmable LED driver | 25% duty-cycle PWM at 250Hz (MAX5986B/C) or constant current (MAX5986A); ILED = 646/RSL mA (RSL in kΩ), enabling status indication with minimal firmware overhead. |
| Internal compensation | Fixed RZERO = 200kΩ and CZERO = 150pF network eliminates need for external compensation components and simplifies loop stability design. |
| Hiccup-mode current limit | Auto-retry protection during overload or short-circuit; limits fault energy and prevents thermal runaway without requiring manual reset. |
Applications
| IP Phones | Wireless Access Nodes |
|---|---|
|
Use Scenario: Powered via Category 5/6 Ethernet cabling in enterprise VoIP deployments with centralized PoE switches. IC Role / Device Role / Timing Role: Primary PD interface and local 3.3V/5V power supply; manages IEEE 802.3af detection, classification, and MPS handshake. Use Value: Enables single-cable deployment with guaranteed 6.49W input power budget, eliminating wall adapters and reducing installation cost. |
Use Scenario: Outdoor or ceiling-mounted Wi-Fi access points requiring robust PoE operation under variable ambient temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: PoE power manager with integrated buck converter; provides stable 5V rail for RF transceivers and baseband SoCs. Use Value: Delivers >85% efficiency at 1A load (VIN = 48V), minimizing thermal rise in sealed enclosures and extending product lifetime. |
| IP Security Cameras | WiMAX Base Stations |
|
Use Scenario: Day/night PTZ cameras with IR illumination, requiring low-noise, regulated 12V or 5V rails from PoE. IC Role / Device Role / Timing Role: Class 2 PD controller with back-bias capability (AUX pin); supplies clean power while supporting MPS for remote management. Use Value: Back-biasing reduces no-load quiescent current by >30%, enabling always-on video analytics without violating PoE power budgets. |
Use Scenario: Compact outdoor small-cell base stations powered over long Ethernet runs with significant voltage drop. IC Role / Device Role / Timing Role: Wide-input (8.7–60V) PD with 4.2V UVLO hysteresis and 150µs deglitch; maintains stable operation despite cable-induced ripple and transients. Use Value: Ensures uninterrupted power delivery during brownouts and lightning-induced surges, meeting carrier-grade reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5987AETE+T | Includes integrated 3.3V/100mA LDO, open-drain RESET output, and LDO_FB pin; lacks sleep/ULP modes and LED driver. | Preferred for systems requiring local low-noise LDO rail and power-good signaling; unsuitable where LED status or ultra-low standby power is needed. | Select MAX5987AETE+T when LDO integration and RESET assertion (VFB < 90%) are required, and sleep functionality is unnecessary. |
| LT4275AIMSE#TRPBF | IEEE 802.3at (PoE+) compatible, supports up to 30W; uses different classification protocol and has no integrated DC-DC converter. | Requires external buck controller and MOSFETs; targets higher-power applications like PTZ cameras with heaters or dual-band radios. | Choose LT4275AIMSE#TRPBF only when upgrading to PoE+ power levels and accepting increased BOM complexity and layout effort. |
Compared with MAX5986AETE+T, MAX5987AETE+T adds LDO and RESET but removes LED/sleep features, while LT4275AIMSE#TRPBF enables PoE+ at the cost of external power stage design and loss of monolithic integration.
Availability
MAX5986AETE+T is available at Aetrix Electronics and suitable for IP phones, wireless access nodes, IP security cameras, and WiMAX base stations requiring stable component supply, full IEEE 802.3af compliance, and integrated power conversion.
Supply support for MAX5986AETE+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 high-performance analog and mixed-signal ICs for power management, interface, and sensing applications in industrial, communications, and automotive markets.
The MAX5986A–MAX5986C family targets IEEE 802.3af PoE-powered endpoints needing compact, efficient, and standards-compliant power delivery with minimal external components.
FAQ
What is the function of the AUX pin on the MAX5986AETE+T?
The AUX pin on the MAX5986AETE+T serves as an auxiliary voltage input to the internal regulator (VDRV). When the DC-DC output voltage exceeds 4.75V, connecting AUX to VOUT back-biases internal circuitry, improving light-load efficiency. If unused, AUX must be connected to clean ground to prevent floating inputs and ensure stable operation of the MAX5986AETE+T.
How does the MAX5986AETE+T achieve IEEE 802.3af Maintain Power Signature (MPS) compliance?
The MAX5986AETE+T achieves MPS compliance through its dedicated MPS pin (pin 11), which sources a periodic current with tMPS_HIGH = 95ms and tMPS_LOW = 190ms, yielding an average current of 4.8mA. This waveform meets IEEE 802.3af §33.3.2.2.3 timing and amplitude requirements, ensuring continuous power recognition by the PSE during low-power or sleep states of the MAX5986AETE+T.
Can the MAX5986AETE+T operate with a 12V input from a wall adapter instead of PoE?
Yes - the MAX5986AETE+T supports wall adapter detection via the WAD pin. When WAD voltage exceeds 8.8V, the internal isolation MOSFET turns off, disconnecting VDD from VCC and allowing auxiliary power to directly feed the DC-DC stage. This enables seamless dual-power-source operation without external OR-ing circuitry, preserving full functionality of the MAX5986AETE+T in hybrid PoE/wall-adapter systems.
What is the purpose of the RREF pin on the MAX5986AETE+T?
The RREF pin on the MAX5986AETE+T connects to a 24.9kΩ resistor to ground and serves as the reference node for both detection signature resistance (25.5kΩ typ) and classification current sinking. During detection mode, it establishes the differential resistance measured by the PSE; during classification, it forms the current path for Class 1 (10.5mA) or Class 2 (18.0mA) signatures - making it essential for IEEE 802.3af interoperability of the MAX5986AETE+T.
Does the MAX5986AETE+T require external compensation components for the DC-DC converter?
No - the MAX5986AETE+T includes an internal compensation network with RZERO = 200kΩ and CZERO = 150pF, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces bill-of-materials cost, and ensures stable loop response across operating conditions without tuning, a key advantage of the MAX5986AETE+T over controller-only alternatives.
MAX5986AETE+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), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 3.84 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 8.7V ~ 60V
- Current - Supply:
- 3.6mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX5986AETE+T FAQ
1.How can I place an order for MAX5986AETE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5986AETE+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 MAX5986AETE+T reliable?
The price and inventory of MAX5986AETE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5986AETE+T is usually 5 days.
3.What payment methods are accepted for MAX5986AETE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5986AETE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5986AETE+T?
MAX5986AETE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5986AETE+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 MAX5986AETE+T?
For technical support, including MAX5986AETE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5986AETE+T requirements.
6.How does Aetrix verify that MAX5986AETE+T is sourced from the original manufacturer or authorized distributors?
All MAX5986AETE+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 MAX5986AETE+T meets industry standards.
7.What is the process for return or replacement of MAX5986AETE+T?
All MAX5986AETE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5986AETE+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 MAX5986AETE+T part is unused and in its original packaging.
Return procedure for MAX5986AETE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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