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Analog Devices Inc./Maxim Integrated MAX5986BETE+T
- Part No.:
- MAX5986BETE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5986BETE+T.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,463
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Product details
Overview
MAX5986BETE+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 5.4V to 14V programmable output voltage, fixed 215kHz switching frequency, and sleep/ultra-low-power modes. It delivers up to 6.49W input power, features built-in TVS for 2kV cable discharge protection, and operates across -40°C to +85°C in PoE-powered IP security cameras and wireless access nodes.
For engineers reviewing the MAX5986BETE+T datasheet, MAX5986BETE+T pinout, MAX5986BETE+T application, or MAX5986BETE+T equivalent, key selection criteria include PoE classification current (10.5mA Class 1 / 18.5mA Class 2), VDD UVLO turn-on threshold (35.7V typ), peak current-limit threshold (0.81A typ), hiccup-mode runaway current limit, and TQFN-16 (5mm × 5mm) package thermal performance (θJA = 35°C/W).
Technical Context
The MAX5986BETE+T implements a complete IEEE 802.3af PD interface with detection signature resistance (25.5kΩ typ), single-resistor Class 1/2 classification, and intelligent Maintain Power Signature (MPS) compliant with 4.8mA average current and 95ms high-time. Its integrated peak-current-mode buck converter supports back-bias operation via AUX input and internal compensation (RZERO = 200kΩ, CZERO = 150pF).
Three operating modes-detection (1.4–10.1V), classification (12.6–20V), and power mode (>35.7V)-are managed by undervoltage lockout with 4.2V hysteresis and 150µs deglitch time. Sleep mode enables 250Hz LED pulsing at 25% duty cycle, while ultra-low-power mode reduces quiescent current further without disabling MPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 8.7V to 60V - supports full PoE voltage range including worst-case cable drop and transient surges. |
| Output Voltage | 5.4V to 14V programmable - adjustable via external FB resistive divider for diverse load requirements. |
| Switching Frequency | 215kHz fixed - balances EMI control, inductor size, and efficiency across light-to-full load. |
| Classification Current | 10.5mA (Class 1) / 18.5mA (Class 2) - set by single 24.9kΩ resistor at RREF, ensuring IEEE 802.3af compliance. |
| Peak Current Limit | 0.81A (CLASS2 = GND) - protects against short-circuit and overload while enabling robust 6.49W input power delivery. |
| Thermal Resistance | θJA = 35°C/W - enables reliable operation at full load in compact 5mm × 5mm TQFN without forced airflow. |
| UVLO Threshold | VON = 35.7V (typ), VOFF = 31.4V (typ) - wide hysteresis prevents oscillation during PoE power-up/down transitions. |
Pinout & Package
MAX5986BETE+T is housed in a 16-pin, 5mm × 5mm, exposed-pad TQFN package (EP connected to GND). Thermal performance is optimized with θJA = 35°C/W and θJC = 2.7°C/W, requiring proper PCB copper pour under the EP for heatsinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AUX) | Auxiliary voltage input | Back-bias path for internal circuitry when output >4.75V; improves light-load efficiency and enables self-powered operation. |
| 2 (LX) | Inductor switch node | Connects to buck converter inductor; handles peak currents up to 1.6A RMS; requires low-inductance layout to minimize ringing. |
| 3 (LED) | LED driver output | Sources pulsed 10–20mA current at 250Hz/25% duty cycle in sleep/ULP modes; used for status indication without external driver. |
| 4 (WK) | Wake enable input | Falling edge exits sleep/ULP modes; internal 50kΩ pullup ensures default wake state; critical for remote wake-up in PoE systems. |
| 5 (FB) | Buck converter feedback | Regulates output via 1.225V reference; connects to resistive divider; sets precise output voltage with ±0.5% regulation accuracy. |
| 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 | Powers MOSFET drivers and internal logic; not for external loads; requires 1µF bypass capacitor to suppress switching noise. |
| 8 (SL) | Sleep mode enable | Falling edge enters sleep mode; RSL sets LED current (ILED = 646/RSL mA); enables low-power status signaling. |
| 9 (ULP) | Ultra-low-power mode enable | Low logic level with SL asserted enables ULP mode; maintains MPS while reducing quiescent current below sleep mode. |
| 10 (CLASS2) | Class selection input | GND = Class 1 (10.5mA), VDRV = Class 2 (18.5mA); determines PSE power allocation and defines maximum input power budget. |
| 11 (MPS) | Maintain Power Signature enable | Drives 4.8mA average current at 95ms/190ms on/off timing to sustain IEEE 802.3af link during low-power states. |
| 12 (WAD) | Wall adapter detector | Detects auxiliary power >8.8V; disables isolation MOSFET to prevent backfeed; enables seamless dual-power-source operation. |
| 13 (VDD) | PoE input supply | Accepts 8.7–60V PoE input; requires 68nF min bypass to PGND; withstands 100V/100ms transients per absolute max rating. |
| 14 (VCC) | DC-DC input rail | Powered via internal p-MOSFET from VDD; supplies buck converter; requires 10µF + 1µF parallel decoupling for stability. |
| 15 (PGND) | Power ground | High-current return for LX and buck stage; must be routed separately from analog GND and joined at single point near EP. |
| 16 (RREF) | Signature resistor connection | Connects to 24.9kΩ resistor to GND; establishes detection resistance (25.5kΩ typ) and classification current per IEEE 802.3af. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PoE PD interface | Eliminates 12+ external components for detection, classification, MPS, and isolation MOSFET - reduces BOM cost and board area. |
| Back-bias capability via AUX | Enables >90% efficiency at light loads by powering internal circuitry from regulated output instead of VDD, extending battery-free uptime. |
| Frequency foldback | Halves switching frequency (215kHz → 107.5kHz) under light load, reducing switching losses and improving efficiency below 10% load. |
| Hiccup-mode current limit | Shuts down converter on sustained overcurrent, then auto-retries - prevents thermal runaway during output short circuits without latch-off. |
| 2kV CAT-6 cable discharge protection | Integrated TVS diode meets IEC 61000-4-5 Level 3 surge immunity, eliminating need for external TVS in PoE port design. |
Applications
| IP Security Cameras | Wireless Access Nodes |
|---|---|
|
Use Scenario: Outdoor PoE-powered camera with motion-triggered recording and IR illumination. IC Role / Device Role / Timing Role: Primary PD controller managing PoE handshaking, 12V rail generation, and LED status signaling. Use Value: Sleep/ULP modes reduce standby power to <15mA while maintaining MPS, extending system uptime during idle periods. |
Use Scenario: Dual-band Wi-Fi 6 access point deployed in ceiling-mounted enclosures with limited airflow. IC Role / Device Role / Timing Role: High-efficiency 12V/1A DC-DC converter with thermal shutdown and hiccup protection. Use Value: 35°C/W θJA and internal thermal shutdown (151°C) ensure reliable operation at full load in confined spaces. |
| VoIP Phones | WiMAX Base Stations |
|
Use Scenario: Enterprise desk phone with Ethernet passthrough and headset jack. IC Role / Device Role / Timing Role: Class 2 PD delivering stable 5.4V output for codec, DSP, and USB interface. Use Value: Programmable output voltage allows direct compatibility with 5V or 5.4V SoC rails without external LDO. |
Use Scenario: Remote outdoor base station powered exclusively via PoE with solar backup. IC Role / Device Role / Timing Role: Robust PD interface with WAD detection enabling seamless switchover to auxiliary power. Use Value: WAD input detects >8.8V wall adapter and disables isolation MOSFET, preventing backfeed and enabling hybrid power architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5986AETE+T | Same package and pinout; 3.0–5.6V output range; higher peak current limit (1.64A); no sleep-mode LED pulsing. | Better suited for 3.3V/5V logic rails; lacks 250Hz LED modulation for status indication in low-power states. | Select MAX5986AETE+T when fixed 5V output and higher current capability are required, and LED signaling is unnecessary. |
| LT4275AIMSE#TRPBF | IEEE 802.3af/at-compliant; supports Class 3/4; includes digital interface (I²C); no integrated DC-DC converter. | Requires external buck controller and power stage; adds flexibility for multi-rail designs but increases component count. | Select LT4275AIMSE#TRPBF when upgrading to PoE+ (802.3at), needing I²C monitoring, or designing custom DC-DC topologies. |
Compared with MAX5986AETE+T and LT4275AIMSE#TRPBF, MAX5986BETE+T uniquely balances Class 2 PoE compliance, integrated 5.4–14V buck conversion, and low-power LED signaling - making it optimal for cost-sensitive, space-constrained 12V PoE endpoints where simplicity and thermal efficiency are prioritized.
Availability
MAX5986BETE+T is available at Aetrix Electronics and suitable for IP security cameras, wireless access nodes, and VoIP phones requiring stable component supply, full IEEE 802.3af compliance, and integrated DC-DC conversion in compact TQFN packaging.
Supply support for MAX5986BETE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX5986x family was designed specifically for IEEE 802.3af-compliant Powered Devices, integrating PD interface, DC-DC conversion, and low-power management to eliminate discrete solutions in PoE endpoint equipment.
FAQ
What is the output voltage range supported by the MAX5986BETE+T?
The MAX5986BETE+T supports a programmable output voltage range of 5.4V to 14V, set via an external resistive divider connected to the FB pin. This range is distinct from the MAX5986A/MAX5987A variants and enables direct compatibility with 12V systems such as IP cameras and wireless access points without additional regulation stages. The FB regulation voltage is precisely 1.225V with ±0.5% accuracy, ensuring stable output under varying load and temperature conditions.
How does the MAX5986BETE+T implement IEEE 802.3af classification?
The MAX5986BETE+T implements IEEE 802.3af classification using a single 24.9kΩ resistor connected from RREF to GND, combined with the CLASS2 pin. When CLASS2 = GND, it sinks 10.5mA (Class 1); when CLASS2 = VDRV, it sinks 18.5mA (Class 2). This current is measured by the PSE during the 12.6–20V classification window and determines the maximum power allocated. The device guarantees tight tolerance (±1.38mA typ) and includes built-in current-limit hysteresis to maintain compliance across temperature.
What is the purpose of the AUX pin on the MAX5986BETE+T?
The AUX pin on the MAX5986BETE+T provides back-bias capability: when the regulated output voltage exceeds 4.75V, connecting AUX to the output powers internal circuitry from the buck rail instead of VDD. This reduces input current draw at light loads, improves overall efficiency, and extends operational uptime in battery-buffered or energy-harvested PoE systems. It is not used in MAX5986A/MAX5987A variants and is essential for achieving >90% efficiency below 10% load.
Does the MAX5986BETE+T support wall adapter detection (WAD)?
Yes, the MAX5986BETE+T supports wall adapter detection via the WAD pin, which triggers at 8.8V rising threshold. When a valid wall adapter is detected, the internal isolation p-MOSFET turns off to prevent backfeeding into the PoE line - enabling seamless dual-power-source operation. This feature is critical for failover-capable devices like VoIP phones and outdoor base stations. WAD requires no external components and integrates directly with the PD interface state machine.
What thermal considerations apply to the MAX5986BETE+T in continuous operation?
The MAX5986BETE+T has a junction-to-ambient thermal resistance (θJA) of 35°C/W in its 5mm × 5mm TQFN package. For continuous 6.49W input power at +70°C ambient, junction temperature reaches ~192°C - exceeding the 150°C absolute maximum. Therefore, derating is required: maximum continuous power drops to ~4.3W at +70°C ambient unless enhanced PCB copper pour (≥4 cm² thermal pad) or airflow is provided. The internal thermal shutdown activates at 151°C with 16°C hysteresis to protect the MAX5986BETE+T.
MAX5986BETE+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:
- 6.49 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)
MAX5986BETE+T FAQ
1.How can I place an order for MAX5986BETE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5986BETE+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 MAX5986BETE+T reliable?
The price and inventory of MAX5986BETE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5986BETE+T is usually 5 days.
3.What payment methods are accepted for MAX5986BETE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5986BETE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5986BETE+T?
MAX5986BETE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5986BETE+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 MAX5986BETE+T?
For technical support, including MAX5986BETE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5986BETE+T requirements.
6.How does Aetrix verify that MAX5986BETE+T is sourced from the original manufacturer or authorized distributors?
All MAX5986BETE+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 MAX5986BETE+T meets industry standards.
7.What is the process for return or replacement of MAX5986BETE+T?
All MAX5986BETE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5986BETE+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 MAX5986BETE+T part is unused and in its original packaging.
Return procedure for MAX5986BETE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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