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Analog Devices Inc./Maxim Integrated MAX5965BEAX+
- Part No.:
- MAX5965BEAX+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
MAX5965BEAX+.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
The MAX5965BEAX+ from Maxim Integrated is a quad, monolithic, -48V power-sourcing equipment (PSE) controller compliant with IEEE 802.3af and compatible with IEEE 802.3at, supporting up to 45W per port, Class 5/6 classification, and AC load disconnect detection. It integrates four independent power-switch controllers with I²C-based real-time current readout and operates across -40°C to +85°C in 36-pin SSOP packaging for Ethernet midspan injectors and switches.
For engineers reviewing the MAX5965BEAX+ datasheet, MAX5965BEAX+ pinout, MAX5965BEAX+ application, or MAX5965BEAX+ equivalent, this device delivers high-power PoE PSE control with programmable fault timing, dual-mode (DC/AC) load disconnect, and software-configurable startup and overcurrent thresholds - critical for robust, field-diagnosable network infrastructure designs.
Technical Context
The MAX5965BEAX+ implements a fully integrated analog/digital architecture for IEEE 802.3af/at-compliant PSE operation, featuring four independent channel state machines with dedicated DET_, SENSE_, GATE_, OUT_, and SHD_ interfaces per port. Its functional diagram confirms separate current-limit foldback control, 9-bit ADC-based port current monitoring, and oscillator-monitored AC disconnect logic exclusive to the MAX5965B variant.
It supports four operational modes - Auto, Semi-Auto, Manual, and Shutdown - each governed by hardware inputs (AUTO, MIDSPAN, RESET) and register-controlled sequencing. The device embeds analog supply monitors (VEE UVLO/OVLO, thermal shutdown at +150°C), digital supply supervision (VDD UVLO/OVLO), and programmable timeouts for startup (50–70ms), fault (50–70ms), and load disconnect (300–400ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | 802.3af-compliant and 802.3at-compatible - enables interoperability with legacy and high-power PDs including Class 5 and 2-event Class 6. |
| Max Power per Port | 45W - achieved via high-power mode with programmable current limit and foldback control, supporting IEEE 802.3bt-classified devices. |
| AC Load Disconnect | Supported - enabled by OSC input monitoring (100Hz ±10%, 2VP-P ±5%, +1.3V offset); only active on MAX5965B variants like MAX5965BEAX+. |
| I²C Interface | 3-wire, fast-mode (400kHz) - provides instantaneous per-port current readout, register configuration, and fault status reporting without external ADC or GPIO expansion. |
| Operating Temp Range | -40°C to +85°C - qualified for extended industrial environments in telecom switches, enterprise routers, and outdoor midspan injectors. |
| Package | 36-pin SSOP - surface-mount footprint with defined thermal dissipation (1388.9mW at +70°C, derated 17.4mW/°C above). |
| Supply Voltage Range | VAGND–VEE = 32V to 60V - supports wide-range -48V DC distribution systems with undervoltage lockout at 28.5V and overvoltage shutdown at 62.5V. |
Pinout & Package
MAX5965BEAX+ is housed in a 36-pin SSOP package (body size 12.8mm × 7.5mm, 0.635mm pitch), optimized for high-density PoE PSE board layouts with isolated analog/digital ground planes and thermal relief pads under AGND/DGND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DET1–DET4 | Detection/Classification voltage output | Generates precise 3.8–4.2V (phase 1) and 9.0–9.6V (phase 2) probe voltages per port; also serves as AC sensing input when ACD_EN_ is enabled. |
| SENSE1–SENSE4 | Current-sense negative input | Connects to MOSFET source; measures VSENSE for current limiting (e.g., 212mV clamp for IVEE=00), foldback, and ADC conversion. |
| GATE1–GATE4 | External MOSFET gate driver | Drives N-channel FET gates with 10V overdrive (typical), internally clamped to 11.4V above VEE to prevent gate oxide damage. |
| OUT1–OUT4 | Drain-voltage sense node | High-impedance input (<2µA leakage) for monitoring VOUT; used for PGOOD generation, short-circuit detection (VDCP = 1V), and open-circuit validation. |
| SHD1–SHD4 | Hardware port shutdown control | Active-low inputs with internal 50kΩ pullup to VDD; allow immediate, software-independent FET turn-off during fault escalation or maintenance. |
| OSC | AC disconnect oscillator monitor | Accepts 100Hz sine wave; disables port power-up if peak falls below 1.8V (fail threshold); function exclusive to MAX5965B variants. |
| INT | Open-drain interrupt output | Asserts low on any fault (overcurrent, thermal, UVLO, OSC fail); supports wired-OR fault aggregation across multiple PSE controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Class 5 & 2-event Class 6 classification | Enables detection and power allocation for high-power PDs (e.g., PTZ cameras, thin clients) beyond standard 802.3af Classes 0–4. |
| Programmable current foldback | Reduces current limit threshold as output voltage rises (e.g., from 212mV at 13V to 64mV at 50V), preventing thermal runaway during cable faults. |
| Selectable DC/AC load disconnect | DC disconnect triggers at 2.5–5.0mV SENSE_ drop; AC disconnect uses OSC input to detect loss of AC signature - both configurable per port. |
| Four independent operational modes | Auto (fully autonomous), Semi-Auto (detection auto, power-up manual), Manual (full software control), and Shutdown (all ports disabled) - simplifies system-level power management. |
| Integrated 9-bit ADC for port current | Provides real-time, calibrated current measurement (±1.5 LSB INL, 1mV LSB) directly over I²C - eliminates need for external current-sense amplifiers. |
Applications
| Enterprise Switch PSE | Midspan Power Injector |
|---|---|
|
Use Scenario: 24-port managed Ethernet switch delivering PoE to VoIP phones, wireless APs, and IP cameras. IC Role / Device Role / Timing Role: Quad-channel PSE controller managing four 4-pair PoE ports (each controlling two data pairs), performing sequential detection/classification and current-limited power delivery. Use Value: Enables 45W per port support for IEEE 802.3bt Type 3/4 PDs while maintaining backward compatibility with 802.3af/at devices via programmable classification thresholds. |
Use Scenario: Standalone 8-port midspan injector adding PoE capability to non-PoE switches in legacy network deployments. IC Role / Device Role / Timing Role: Primary PSE controller implementing endpoint-style power delivery on signal pairs; uses MIDSPAN = low to configure for endpoint mode. Use Value: Delivers stable -48V power with integrated UVLO/OVLO/thermal protection and AC disconnect for enhanced reliability in unattended remote locations. |
| Industrial Router PSE | Smart Building Controller |
|
Use Scenario: Ruggedized industrial router powering surveillance cameras and sensors in factory automation networks. IC Role / Device Role / Timing Role: High-reliability PSE controller operating in extended temperature range (-40°C to +85°C); uses Manual mode for deterministic firmware-controlled port sequencing. Use Value: Ensures safe hot-swap operation with programmable startup timeout (50–70ms) and fault recovery delay (400ms), minimizing false disconnects in electrically noisy environments. |
Use Scenario: Central building management system supplying PoE to occupancy sensors, access control readers, and HVAC controllers. IC Role / Device Role / Timing Role: Software-configurable PSE controller using I²C interface to report real-time port current and fault status to central BMS host MCU. Use Value: Provides granular energy monitoring (via 9-bit ADC) and rapid fault isolation (open-drain INT per controller) for predictive maintenance and power budgeting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5965AEAX+ | Lacks AC load disconnect functionality; OSC pin unused; identical pinout and DC disconnect behavior. | Suitable only for endpoint PSE designs where AC signature detection is not required (e.g., basic VoIP deployments). | Select MAX5965AEAX+ when AC disconnect is unnecessary and cost optimization is prioritized; MAX5965BEAX+ adds critical safety for legacy PDs with capacitive loads. |
| LTC4259AIDE#PBF | Triple-channel PSE controller; no Class 5/6 classification; fixed 15.4W/port limit; no I²C current readout; requires external ADC for monitoring. | Targeted at lower-power, cost-sensitive 802.3af-only systems (e.g., small office switches) with simpler firmware requirements. | Choose LTC4259AIDE#PBF for legacy 802.3af compliance only; MAX5965BEAX+ offers higher power, richer diagnostics, and future-proof 802.3at/bt readiness. |
Compared with MAX5965AEAX+, MAX5965BEAX+ adds mandatory AC disconnect for legacy PD safety; versus LTC4259AIDE#PBF, it delivers double the per-port power, integrated current telemetry, and advanced classification - enabling scalable, intelligent PoE infrastructure with reduced BOM count and diagnostic overhead.
Availability
MAX5965BEAX+ is available at Aetrix Electronics and suitable for enterprise switches, midspan injectors, and industrial routers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX5965BEAX+ 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 leader specializing in high-performance analog, mixed-signal, and power management ICs for communications, computing, and industrial markets.
The MAX5965B product line was designed specifically for next-generation Power over Ethernet power-sourcing equipment, integrating IEEE 802.3af/at/bt compliance, multi-level classification, and embedded diagnostics into a single quad-channel controller.
FAQ
What distinguishes MAX5965BEAX+ from the MAX5965AEAX+ variant?
The MAX5965BEAX+ includes full AC load disconnect capability via its OSC input, enabling detection of legacy powered devices that rely on AC signature for identification. This feature is absent in the MAX5965AEAX+, which supports only DC disconnect. Both share identical pinout, temperature rating (-40°C to +85°C), and SSOP-36 packaging, but MAX5965BEAX+ is required for deployments involving older PDs with high-capacitance interfaces or midspan configurations demanding AC signature validation.
How does the MAX5965BEAX+ implement Class 5 and 2-event classification?
The MAX5965BEAX+ performs Class 5 detection using an extended voltage window during the second classification phase and supports 2-event classification by applying two distinct current pulses to identify high-power PDs compliant with IEEE 802.3at Type 2 or 802.3bt. These functions are enabled through register configuration (R23h[2:0]) and require no external components - allowing seamless integration into firmware-controlled PSE systems without modifying hardware layout.
Can the MAX5965BEAX+ operate in midspan mode, and how is it configured?
Yes, the MAX5965BEAX+ supports midspan operation via the MIDSPAN pin: pulling MIDSPAN high (to VDIG) configures the device for midspan PSE mode, while leaving it unconnected or pulled low defaults to endpoint mode. This hardware-selectable configuration determines whether power is delivered on spare pairs (midspan) or data pairs (endpoint), and is latched at power-up or reset - ensuring deterministic behavior without software dependency.
What is the role of the 9-bit ADC in the MAX5965BEAX+, and how is it accessed?
The integrated 9-bit ADC in the MAX5965BEAX+ digitizes port current measurements from the SENSE_ inputs, providing calibrated readings with ±1.5 LSB integral nonlinearity and 1mV LSB resolution. Data is accessed exclusively via the I²C interface using register addresses 1Ch–1Fh (per port), enabling real-time current monitoring, dynamic power budgeting, and fault logging without external signal conditioning circuitry.
Does the MAX5965BEAX+ support programmable fault recovery timing, and what parameters are adjustable?
Yes, the MAX5965BEAX+ supports full programmability of fault timing parameters through its I²C register map. Startup timeout (R15h), overcurrent fault timeout (R15h), and load-disconnect detection timeout (R16h) can all be adjusted in increments matching the internal watchdog clock period (164ms). This allows designers to tailor response behavior to specific cable lengths, PD types, and system-level safety requirements - for example, extending tDISC to 400ms for long-haul installations with high parasitic capacitance.
MAX5965BEAX+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 45 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 32V ~ 60V
- Current - Supply:
- 4.8mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
MAX5965BEAX+ FAQ
1.How can I place an order for MAX5965BEAX+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5965BEAX+ 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 MAX5965BEAX+ reliable?
The price and inventory of MAX5965BEAX+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5965BEAX+ is usually 5 days.
3.What payment methods are accepted for MAX5965BEAX+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5965BEAX+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5965BEAX+?
MAX5965BEAX+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5965BEAX+ 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 MAX5965BEAX+?
For technical support, including MAX5965BEAX+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5965BEAX+ requirements.
6.How does Aetrix verify that MAX5965BEAX+ is sourced from the original manufacturer or authorized distributors?
All MAX5965BEAX+ 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 MAX5965BEAX+ meets industry standards.
7.What is the process for return or replacement of MAX5965BEAX+?
All MAX5965BEAX+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5965BEAX+, 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 MAX5965BEAX+ part is unused and in its original packaging.
Return procedure for MAX5965BEAX+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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