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Analog Devices Inc./Maxim Integrated MAX5995BETE+T
- Part No.:
- MAX5995BETE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX5995BETE+T.pdf
- Description:
- IEEE 802.3BT-COMPLIANT, POWERED
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX5995BETE+T from Maxim Integrated is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller with integrated 91W isolation MOSFET, 100V absolute maximum input rating, inrush current limit of 135mA (typ), and intelligent maintain power signature (IMPS) for PoE systems. It enables Type 1–4 PSE classification indication and seamless wall adapter switchover in IP security cameras and wireless access points.
For engineers reviewing the MAX5995BETE+T datasheet, MAX5995BETE+T pinout, MAX5995BETE+T application, or MAX5995BETE+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with functional differences, and supply-ready availability details - all grounded in Maxim's official documentation for the MAX5995B variant in TQFN-EP package.
Technical Context
The MAX5995BETE+T implements a multi-event classification engine compliant with IEEE 802.3bt, supporting up to 5 classification events via CLSA/CLSB resistor programming to signal PD Class 0–8 power requests. Its IMPS feature automatically enables MPS current upon detection of port current, eliminating external control logic.
It integrates a thermally enhanced n-channel isolation MOSFET (RON_ISO = 0.1Ω typ at TJ = +25°C), dual-stage current limiting (135mA inrush → 1800–2400mA normal operation), and foldback protection triggered at VRTN = 7.0V (typ). The device operates across –40°C to +85°C and features 35°C/W junction-to-ambient thermal resistance on a four-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with 802.3af/at/bt standards - supports detection, classification, and power mode handshaking required for Type 1–4 PSE interoperability. |
| Input Voltage Range | Operates from 35.4V (VON typ) to 60V - ensures reliable startup and steady-state operation across PoE+ and PoE++ voltage envelopes. |
| Inrush Current Limit | 135mA typical during startup - limits stress on upstream magnetics and prevents PSE false disconnect during hot-plug. |
| Normal Operation Current Limit | 1800–2400mA typical - supports up to 91W delivered power (at 48V × 1.9A) with integrated MOSFET. |
| MOSFET On-Resistance | 0.1Ω typical at +25°C - minimizes conduction loss and thermal rise in high-power PD designs. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and outdoor IP camera, AP, and small cell deployments. |
| Package | 16-pin, 5mm × 5mm TQFN-EP with exposed pad - enables high-power dissipation and compact PCB layout. |
Pinout & Package
MAX5995BETE+T is housed in a thermally enhanced 16-pin, 5mm × 5mm TQFN-EP package (package code T1655+4) with exposed pad (EP) that must be soldered to VSS for optimal thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DET | Detection resistor input | Connects 24.9kΩ signature resistor between DET and VDD - enables IEEE-compliant PD detection by PSE slope measurement (ΔV/ΔI). |
| VDD | Positive supply input | Accepts 35.4–60V PoE input; requires ≥68nF bypass capacitor to VSS - powers internal regulator and gate driver. |
| CLSA / CLSB | Classification resistor inputs | Set classification current per IEEE 802.3bt: RCLSA configures Events 1–2 (af/at), RCLSB configures Events 3–5 (bt) - defines PD Class 0–8 and requested power level. |
| RTN | Drain of integrated MOSFET | Connects to downstream DC-DC converter ground - carries full load current (up to 2.4A); voltage drop across RTN–VSS enables current sensing and foldback. |
| PG | Open-drain power-good output | Sinks 230µA during inrush and sleep modes - disables downstream DC-DC until MOSFET is fully enhanced and stable. |
| MEC | Multi-event classification indicator | Generates pulse-width-modulated patterns (256/512/768µs pulses, 1024µs period) - encodes allocated PSE power level (12.95W to 71W) for system-level monitoring. |
| WAD | Wall adapter detector input | Detects >9V between WAD and RTN - triggers automatic switchover from PoE to auxiliary power without firmware intervention. |
| LED / SL / WK / ULP | LED driver & sleep control inputs | SL falling edge initiates sleep; WK falling edge wakes; ULP enables Ultra-Low-Power mode; LED sources 250Hz, 25% duty pulses - enables low-power status indication and MPS maintenance. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent Maintain Power Signature (IMPS) | Automatically enables MPS current upon detection of port current - eliminates need for external timing circuitry or host MCU polling. |
| Multi-Event Classification (0–8) | Supports full IEEE 802.3bt classification via programmable CLSA/CLSB resistors - enables precise power negotiation up to Class 8 (71W). |
| Two-Step Current Limit & Foldback | 135mA inrush → 2400mA operating limit, with foldback activation at VRTN = 7.0V - protects MOSFET under sustained overload while maintaining system uptime. |
| Integrated 91W Isolation MOSFET | RON_ISO = 0.1Ω typ at +25°C - reduces BOM count, PCB area, and thermal design complexity versus discrete FET solutions. |
| Wall Adapter Switchover | WAD pin detects >9V auxiliary supply - enables seamless, glitch-free transition from PoE to wall power without interrupting system operation. |
Applications
| IP Security Cameras | Wireless Access Points |
|---|---|
|
Use Scenario: Outdoor PTZ camera with heater, IR illuminator, and video streaming over PoE++ infrastructure. IC Role / Device Role / Timing Role: PD interface controller managing IEEE 802.3bt classification, inrush control, and dual-power source arbitration. Use Value: Enables 71W power delivery (Class 8) for full-feature operation while maintaining compliance with legacy 802.3af/at switches via multi-event fallback. |
Use Scenario: Dual-band 802.11ax AP deployed in enterprise ceiling mounts with PoE++ uplink and local battery backup. IC Role / Device Role / Timing Role: Powered device controller providing MEC-based power-level reporting and automatic wall adapter switchover during mains outage. Use Value: Delivers uninterrupted Wi-Fi service using IMPS to sustain PSE link during low-power sleep, reducing standby consumption by >50% vs. standard MPS. |
| Small Cell Base Stations | Smart Building Lighting Controllers |
|
Use Scenario: 4G/LTE pico cell unit powered via 4-pair PoE in distributed antenna systems. IC Role / Device Role / Timing Role: High-reliability PD interface with thermal shutdown (150°C) and UVLO hysteresis (4.2V) for stable operation in temperature-variable enclosures. Use Value: Supports 5-event classification to negotiate 61W–71W input, enabling RF power amplification and backhaul without external DC-DC staging. |
Use Scenario: DALI-enabled LED lighting node with PoE-powered microcontroller, sensors, and dimming drivers in commercial offices. IC Role / Device Role / Timing Role: PD controller delivering PG-synchronized enable timing to downstream buck converters and driving status LED via SL-programmed current. Use Value: Integrates LED driver (10–20mA programmable) and MEC power-level feedback - eliminates discrete LED biasing and simplifies commissioning diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5995AETE+T | Lacks Intelligent MPS (IMPS); uses fixed-timing MPS with no current-sense activation - requires external control or fixed timer. | Suitable for cost-sensitive, static-power PDs where PSE port current monitoring is unavailable or unnecessary. | Select when IMPS functionality is not required and lowest BOM cost is prioritized over autonomous MPS activation. |
| LT4275IMS#PBF | IEEE 802.3bt-compliant PD controller with 100V rating but no integrated MOSFET - requires external high-side switch and gate driver. | Better suited for ultra-high-efficiency or high-temperature (>85°C) designs where discrete MOSFET selection optimizes RDS(on) and thermal path. | Select when thermal budget or efficiency demands exceed integrated MOSFET capability, or when design flexibility for discrete power stage is needed. |
Compared with MAX5995AETE+T, the MAX5995BETE+T adds autonomous IMPS activation and identical classification/MPS timing; compared with LT4275IMS#PBF, it trades external MOSFET flexibility for reduced component count, smaller footprint, and guaranteed thermal coupling between controller and switch.
Availability
MAX5995BETE+T is available at Aetrix Electronics and suitable for IP security cameras, wireless access points, and small cell base stations requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX5995BETE+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 MAX5995 family is designed specifically for IEEE 802.3bt-compliant powered devices, integrating detection, classification, power switching, and intelligent power management into a single TQFN package for space-constrained PoE endpoints.
FAQ
What is the primary function of the MAX5995BETE+T in a PoE system?
The MAX5995BETE+T serves as a complete IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. It performs detection signature generation, multi-event classification (0–8), inrush current limiting, and controls an integrated 91W isolation MOSFET to safely deliver power from the PSE to downstream circuitry. Its IMPS feature enables autonomous maintain power signature activation based on port current detection - a core capability distinguishing MAX5995BETE+T from earlier variants like MAX5995AETE+T.
Does the MAX5995BETE+T support wall adapter switchover, and how does it work?
Yes, the MAX5995BETE+T supports seamless wall adapter switchover via its WAD pin. When a voltage >9V is detected between WAD and RTN, the device automatically disables the isolation MOSFET and transitions power sourcing from PoE to the auxiliary supply - without interrupting system operation or requiring host MCU intervention. This behavior is confirmed in the Functional Diagrams and Pin Description sections of the official datasheet, and applies identically to the MAX5995BETE+T variant.
What is the difference between MAX5995BETE+T and MAX5995AETE+T regarding MPS functionality?
The MAX5995BETE+T implements Intelligent Maintain Power Signature (IMPS), which automatically enables MPS current upon detection of port current - eliminating need for external timing components. In contrast, MAX5995AETE+T uses fixed-timing MPS with no current-sense activation logic. This difference is explicitly documented in the Benefits and Features section and Electrical Characteristics table (IMPS_RISE/FALL parameters), and directly impacts system-level power management autonomy in the MAX5995BETE+T.
What package type and thermal characteristics apply to the MAX5995BETE+T?
The MAX5995BETE+T uses a 16-pin, 5mm × 5mm TQFN-EP package (outline 21-0140, land pattern 90-0121) with exposed pad connected to VSS. Its thermal resistance is θJA = 35°C/W on a four-layer board, and θJC = 2.7°C/W - values confirmed in the Package Information section. These characteristics enable reliable operation at full 91W load within the –40°C to +85°C ambient range specified for the BETE grade.
How does the MAX5995BETE+T indicate allocated PSE power level to the system?
The MAX5995BETE+T uses the MEC (Multi-Event Classification) pin to communicate allocated PSE power via pulse-width-modulated patterns. A START bit (256µs, 25% duty) is followed by three variable-width pulses (512µs or 768µs) encoding 1–5 classification events - corresponding to power levels from 12.95W to 71W as defined in Table 2 of the datasheet. This real-time feedback is active only during power mode and disabled in sleep/ULP modes, and applies specifically to the MAX5995BETE+T variant.
MAX5995BETE+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:
- 91 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 60V
- Current - Supply:
- 250µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX5995BETE+T FAQ
1.How can I place an order for MAX5995BETE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5995BETE+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 MAX5995BETE+T reliable?
The price and inventory of MAX5995BETE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5995BETE+T is usually 5 days.
3.What payment methods are accepted for MAX5995BETE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5995BETE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5995BETE+T?
MAX5995BETE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5995BETE+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 MAX5995BETE+T?
For technical support, including MAX5995BETE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5995BETE+T requirements.
6.How does Aetrix verify that MAX5995BETE+T is sourced from the original manufacturer or authorized distributors?
All MAX5995BETE+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 MAX5995BETE+T meets industry standards.
7.What is the process for return or replacement of MAX5995BETE+T?
All MAX5995BETE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5995BETE+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 MAX5995BETE+T part is unused and in its original packaging.
Return procedure for MAX5995BETE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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