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Analog Devices Inc./Maxim Integrated MAX5986AETE+
- Part No.:
- MAX5986AETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5986AETE+.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
MAX5986AETE+ from Maxim Integrated is an IEEE 802.3af-compliant Class 1/Class 2 Powered Device (PD) IC with integrated DC-DC buck converter, supporting 8.7V–60V input, 3.0V–5.6V programmable output, and fixed 215kHz switching frequency. It delivers up to 6.49W input power, features sleep/ultra-low-power modes, and includes built-in TVS for 2kV cable discharge protection - deployed in IP phones and PoE security cameras.
For engineers reviewing the MAX5986AETE+ datasheet, MAX5986AETE+ pinout, MAX5986AETE+ application, or MAX5986AETE+ equivalent, key selection criteria include PoE classification current (10.5mA Class 1 / 18mA Class 2), inrush limit (49mA typ), UVLO thresholds (35.7V turn-on / 31.4V turn-off), and thermal shutdown at 151°C - all verified per Maxim's Rev 7 datasheet.
Technical Context
The MAX5986AETE+ implements a complete IEEE 802.3af PD interface with detection signature resistance (25.5kΩ typ), Class 1/2 classification via single RSIG resistor, and intelligent Maintain Power Signature (MPS) delivering 4.8mA average current with 95ms high-time. Its peak-current-mode buck controller operates from 8.7V to 60V VDD, supports back-bias operation via AUX, and uses internal compensation (RZERO = 200kΩ, CZERO = 150pF).
It integrates isolation pMOS (RON_ISO = 1.2Ω @ 25°C), low-side nMOS (RDSON-L = 0.16Ω), and hiccup-mode current limiting (323mA operating / 1.64A peak). Sleep mode is triggered by SL falling edge; ultra-low-power mode requires simultaneous ULP low assertion - both maintain MPS compliance while reducing quiescent current to <12mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.7V to 60V - supports full PoE voltage range including worst-case cable drop and transient surges. |
| Output Voltage Range | 3.0V to 5.6V - adjustable via FB resistive divider; enables direct powering of 3.3V/5V logic and analog circuitry. |
| Switching Frequency | Fixed 215kHz - balances EMI, efficiency, and external component size; includes frequency foldback to 107.5kHz at light load. |
| Classification Current | 10.5mA (Class 1) or 18mA (Class 2) - set by single 24.9kΩ resistor at RREF; meets IEEE 802.3af Class 1/2 specification. |
| Inrush Current Limit | 49mA (typ) - limits surge during VDD ramp-up, preventing PSE tripping and enabling reliable hot-plug operation. |
| Thermal Shutdown | 151°C with 16°C hysteresis - protects against sustained overload or poor PCB thermal design without false triggering. |
| UVLO Thresholds | VON = 35.7V (typ), VOFF = 31.4V (typ) - wide 4.3V hysteresis compensates for twisted-pair IR drop and ensures glitch-free mode transitions. |
Pinout & Package
MAX5986AETE+ is housed in a 16-pin, 5mm × 5mm TQFN package with exposed pad (EP) connected to GND for thermal management. The package supports -40°C to +85°C ambient operation and has θJA = 35°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AUX) | Auxiliary voltage input | Back-bias path for internal regulator when VOUT > 4.75V; improves light-load efficiency and reduces VDD current draw. |
| 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. |
| 5 (FB) | Feedback input | Senses output voltage via resistive divider; regulates VOUT to 1.225V reference; sets output with ±0.5% accuracy over temperature. |
| 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 gate drivers and internal logic; not for external loads; requires 1µF bypass capacitor to GND. |
| 10 (CLASS2) | Class selection control | Ground = Class 1 (10.5mA); connect to VDRV = Class 2 (18mA); determines maximum PSE power allocation. |
| 13 (VDD) | PoE input supply | Main PD input from PSE; accepts 8.7–60V; requires 68nF bypass to PGND; monitored for UVLO and MPS timing. |
| 14 (VCC) | Buck converter input | Powered via internal isolation pMOS; supplies DC-DC stage after inrush limit; bypassed with 10µF + 1µF ceramic. |
| 15 (PGND) | Power ground | High-current return for LX and buck stage; must be routed separately from analog GND and tied at single point. |
| 16 (RREF) | Signature resistor connection | Connects external 24.9kΩ resistor to GND; establishes detection resistance (25.5kΩ typ) and classification current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PoE PD interface | Fully compliant with IEEE 802.3af detection, classification (Class 1/2), and MPS - eliminates need for discrete diode bridges, sense resistors, and timing capacitors. |
| Back-bias capability | Enables AUX input to power internal circuitry from VOUT when >4.75V, reducing VDD current by ~30% at light load and extending system efficiency. |
| Programmable LED driver | SL pin controls ILED amplitude (10–20mA) via external RSL; supports status indication in sleep/ULP modes with 25% duty cycle (MAX5986B/C) or 100% (MAX5986A). |
| Hiccup-mode current limit | Triggers runaway protection at 1.9A (peak) and enters auto-retry mode - prevents thermal runaway during sustained short-circuit or overload conditions. |
| Robust CDE protection | Integrated TVS withstands 2kV, 200m CAT-6 cable discharge event per IEC 61000-4-5 - eliminates need for external TVS diodes in most PoE endpoint designs. |
Applications
| IP Phones | Wireless Access Nodes |
|---|---|
|
Use Scenario: Powered via PoE from enterprise switch in desk-mounted VoIP handset with audio codec, Ethernet PHY, and LED status indicators. IC Role / Device Role: Primary PD interface and local 5V/3.3V power supply; manages classification, MPS, and regulated output for baseband and RF sections. Use Value: Enables single-cable deployment with guaranteed 6.49W input power, sleep-mode current reduction (<12mA), and integrated CDE protection for field reliability. |
Use Scenario: Outdoor Wi-Fi access point powered over 100m CAT-6 cable with environmental temperature cycling and lightning-induced transients. IC Role / Device Role: IEEE 802.3af-compliant PD with robust UVLO hysteresis (4.3V), 2kV CDE immunity, and thermal shutdown - ensures stable startup and fault recovery. Use Value: Eliminates external surge protection components; maintains MPS during ultra-low-power sleep to comply with standby power budgets. |
| IP Security Cameras | WiMAX Base Stations |
|
Use Scenario: Day/night PTZ camera with image sensor, motor drivers, and IR illuminators drawing burst current up to 1.2A at 5V. IC Role / Device Role: High-efficiency buck converter (85% @ 1A, VIN=48V) with fast transient response and hiccup-mode overload protection. Use Value: Delivers stable 5V rail under dynamic load; frequency foldback maintains >75% efficiency at 100mA idle current - extends battery backup runtime. |
Use Scenario: Compact outdoor WiMAX subscriber unit requiring PoE power, low-noise 3.3V for RF front-end, and fail-safe reset signaling. IC Role / Device Role: PD interface with precise 1.225V FB reference (±0.5%) and clean VDRV supply - minimizes voltage ripple on sensitive RF bias rails. Use Value: Internal LDO not present (MAX5986A variant), but FB regulation accuracy and PGND/GND separation ensure <10mV p-p noise on critical analog supplies. |
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+ | Includes integrated 3.3V/100mA LDO, open-drain RESET output, and LDO_FB feedback pin - no external LDO required. | Preferred for systems needing dedicated low-noise 3.3V rail and power-good monitoring; adds 1mm² PCB area vs. MAX5986A. | Select MAX5987AETE+ when LDO integration simplifies BOM and RESET signaling is required for microcontroller sequencing. |
| LT4275AIMSE#TRPBF | IEEE 802.3at (PoE+) compatible, supports Class 4 (30W), higher VDD max (67V), and includes digital interface (I²C) for telemetry. | Required for >12.95W applications (e.g., pan-tilt-zoom cameras with heaters); lacks integrated DC-DC - needs external buck controller. | Choose LT4275AIMSE#TRPBF only if PoE+ power level or telemetry capability is mandatory; otherwise MAX5986AETE+ offers lower cost and higher integration. |
Compared with MAX5987AETE+, MAX5986AETE+ saves board space and cost by omitting the LDO and RESET, making it ideal for cost-sensitive, space-constrained PoE endpoints where external regulation is already present. Against LT4275AIMSE#TRPBF, MAX5986AETE+ provides full DC-DC integration and lower system-level BoM count for Class 1/2 applications.
Availability
MAX5986AETE+ is available at Aetrix Electronics and suitable for IP phones, wireless access nodes, IP security cameras, and WiMAX base stations requiring stable component supply, long-term lifecycle support, and full IEEE 802.3af compliance.
Supply support for MAX5986AETE+ 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 MAX5986AETE+ belongs to Maxim's PoE PD interface product line, designed specifically to reduce design time and BOM cost for IEEE 802.3af-compliant endpoints by integrating detection, classification, MPS, DC-DC conversion, and protection functions in one TQFN package.
FAQ
What is the maximum input power supported by the MAX5986AETE+?
The MAX5986AETE+ supports up to 6.49W of input power as defined by IEEE 802.3af Class 2 operation. This is derived from its 323mA operating current limit and maximum 60V VDD rating. The device enforces this limit via hiccup-mode current protection and complies with Class 2 signature requirements when CLASS2 = VDRV. MAX5986AETE+ does not support PoE+ (802.3at) higher power classes.
Does the MAX5986AETE+ require an external MOSFET for isolation?
No. The MAX5986AETE+ integrates a p-channel isolation MOSFET with 1.2Ω on-resistance at 25°C between VDD and VCC. This eliminates the need for external high-voltage MOSFETs and associated gate-drive circuitry. The device automatically controls turn-on with inrush current limiting (49mA typ) and transitions to full conduction once VCC reaches VDD − 1.5V.
How is the output voltage programmed on the MAX5986AETE+?
The MAX5986AETE+ output voltage is programmed using a resistive divider from VOUT to GND connected to the FB pin. The internal reference is 1.225V, so VOUT = 1.225V × (1 + R1/R2). The device supports 3.0V to 5.6V output range; for example, 5.0V output requires R1 = 316kΩ and R2 = 100kΩ. No external compensation is needed - the MAX5986AETE+ uses internal compensation network (RZERO = 200kΩ, CZERO = 150pF).
Can the MAX5986AETE+ operate without an external signature resistor?
No. The MAX5986AETE+ requires a 24.9kΩ resistor (RSIG) connected from RREF to GND to establish the IEEE 802.3af detection signature resistance (~25.5kΩ) and set classification current. Omitting RSIG prevents proper detection by the PSE and causes failure to enter power mode. The resistor tolerance directly impacts classification accuracy - 1% tolerance is recommended per Maxim's design guidelines.
What is the purpose of the AUX pin on the MAX5986AETE+?
The AUX pin on the MAX5986AETE+ enables back-bias operation: when VOUT exceeds 4.75V, AUX can be connected to VOUT to power the internal 5V VDRV regulator, reducing VDD current draw by ~30% at light load and improving overall system efficiency. If unused, AUX must be connected to clean GND. It is not a power output - no external loading is permitted.
MAX5986AETE+ 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), 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+ FAQ
1.How can I place an order for MAX5986AETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5986AETE+ 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+ reliable?
The price and inventory of MAX5986AETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5986AETE+ is usually 5 days.
3.What payment methods are accepted for MAX5986AETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5986AETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5986AETE+?
MAX5986AETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5986AETE+ 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+?
For technical support, including MAX5986AETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5986AETE+ requirements.
6.How does Aetrix verify that MAX5986AETE+ is sourced from the original manufacturer or authorized distributors?
All MAX5986AETE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5986AETE+?
All MAX5986AETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5986AETE+, 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+ part is unused and in its original packaging.
Return procedure for MAX5986AETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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