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Analog Devices Inc./Maxim Integrated MAX5965AEAX+T
- Part No.:
- MAX5965AEAX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
MAX5965AEAX+T.pdf
- Description:
- IC PSE CTRLR FOR POE 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
The MAX5965AEAX+T 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 (2-event) PD classification, and instantaneous I²C-readout of port current. It operates across -40°C to +85°C in 36-pin SSOP packaging and is used in Ethernet switches and midspan injectors for PoE-powered surveillance cameras and VoIP phones.
For engineers reviewing the MAX5965AEAX+T datasheet, MAX5965AEAX+T pinout, MAX5965AEAX+T application, or MAX5965AEAX+T equivalent, key selection criteria include IEEE 802.3af/at compliance, high-power mode support, programmable current-limit thresholds, DC/AC load disconnect detection, and I²C-based real-time current monitoring for system-level power management.
Technical Context
The MAX5965AEAX+T implements four independent PSE port controllers with integrated gate drivers, current-sense amplifiers, and a 9-bit ADC for VSENSE_ measurement. Its architecture supports auto, semi-auto, manual, and shutdown operating modes, enabling flexible software control over PD detection, classification, and power-up sequencing.
It features dual-stage detection (3.8–4.2V and 9.0–9.6V probe voltages), programmable current-limit clamp (170–220mV), foldback current limiting, and thermal/overvoltage/undervoltage protection with hysteresis. The device uses an I²C-compatible 3-wire serial interface (SCL, SDAIN, SDAOUT) and provides open-drain INT signaling for fault reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | IEEE 802.3af-compliant and 802.3at-compatible - ensures interoperability with legacy and high-power PDs including Class 0–5 and 2-event Class 6. |
| Max Power per Port | 45W - enabled via high-power mode, supporting IEEE 802.3at Type 2 (PoE+) applications without external circuitry. |
| Current-Limit Threshold | 170–220mV (programmable) - sets precise current trip point across four ports using external sense resistors (e.g., 0.5Ω yields ~340mA–440mA limit). |
| I²C Interface | 3-wire, Fast Mode (400kHz) - enables real-time readout of port current, fault status, and configuration registers without bus contention. |
| Operating Temp Range | -40°C to +85°C - qualified for extended industrial environments in telecom switches and outdoor network infrastructure. |
| Supply Voltage Range | VAGND = 32V to 60V (–48V nominal), VDD = 2.4V to 3.6V - supports wide-input PoE systems with robust UVLO/OVLO protection. |
| Detection Accuracy | RDOK = 19.0–26.5kΩ resistor window - ensures reliable 25kΩ PD signature detection while rejecting invalid loads (e.g., <15.2kΩ or >32kΩ). |
Pinout & Package
MAX5965AEAX+T is housed in a 36-pin SSOP package (body size 12.8mm × 7.5mm, 0.635mm pitch), optimized for high-density PoE midspan and switch designs with thermal pad grounding via AGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DET1–DET4 | PD Detection/Classification Probe Outputs | Generate controlled voltage probes (3.8–4.2V, then 9.0–9.6V) to verify valid PD signature resistance; also serve as AC-disconnect sensing inputs on MAX5965B variants. |
| SENSE1–SENSE4 | Current-Sense Negative Inputs | Connect to MOSFET source terminals; measure voltage drop across external sense resistors to enforce current limits and detect overloads. |
| GATE1–GATE4 | External N-Channel MOSFET Gate Drivers | Drive high-side FET gates with internal 10V clamp; support fast turn-on/turn-off and foldback current limiting during overload conditions. |
| OUT1–OUT4 | Drain Voltage Sense Inputs | Monitor MOSFET drain voltage with <100mV drop across series resistor; enable PGOOD assertion and short-circuit detection (VDCP = 1V threshold). |
| SHD1–SHD4 | Hardware Port Shutdown Inputs | Active-low signals that force immediate gate shutdown independent of software state-used for emergency power removal or safety interlocks. |
| INT | Open-Drain Fault Interrupt Output | Asserts low on any fault (overcurrent, overtemp, UVLO, OSC fail); requires external pull-up; supports daisy-chained interrupt handling in multi-port systems. |
| SCL / SDAIN / SDAOUT | I²C-Compatible Serial Interface | 3-wire interface (clock, input data, output data) avoids bidirectional bus contention; supports address configuration via A0–A3 pins (default 010xxxxb). |
| RESET | Hardware Reset Input | Pull low ≥300µs to reset all registers and latch A0–A3, AUTO, MIDSPAN logic levels; internal 50kΩ pull-up to VDD ensures default startup behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Four Independent PSE Ports | Enables single-chip control of four PoE ports in compact switches or injectors-reducing BOM count and PCB area vs. discrete controllers. |
| Class 5 & 2-Event Classification | Supports IEEE 802.3at Type 2 PDs (up to 34.2W) and advanced 2-event Class 6 detection-critical for powering high-end wireless APs and PTZ cameras. |
| High-Capacitance Detection | Identifies legacy PDs with large input capacitance (>10µF) during detection phase-prevents false rejection of compliant but capacitive devices. |
| Programmable Load-Stability Check | Configurable timing window during detection to confirm stable PD signature-rejects transient loads like ESD events or cable faults. |
| DC & AC Load Disconnect Detection | DC disconnect triggers at VSENSE_ < 2.5–5.0mV; AC disconnect (MAX5965B only) uses OSC input to detect AC-coupled PD removal-enhances system reliability. |
| Current Foldback + Duty-Cycle Limiting | Reduces output current progressively above trip threshold (e.g., from 440mA to 130mA as VOUT rises), preventing thermal runaway during sustained overload. |
Applications
| Enterprise Switches | Midspan Power Injectors |
|---|---|
|
Use Scenario: 24-port managed Ethernet switch delivering PoE to IP phones, badge readers, and wireless access points. IC Role / Device Role / Timing Role: Quad PSE controller managing four 45W PoE channels per IC; handles detection, classification, current limiting, and fault recovery per port. Use Value: Enables full IEEE 802.3at compliance with single-chip scalability-reducing component count by 75% vs. dual-port alternatives and simplifying thermal design. |
Use Scenario: Standalone 8-port midspan injector adding PoE capability to non-PoE switches in legacy office networks. IC Role / Device Role / Timing Role: Primary PSE controller executing IEEE-mandated 2-phase detection (≤330ms), classification (≤23ms), and soft-start ramp (≤70ms) per port. Use Value: Supports hot-swap insertion and automatic reclassification after cable reseat-ensuring zero-downtime operation for mission-critical VoIP deployments. |
| Outdoor Network Cameras | Industrial IoT Gateways |
|
Use Scenario: Ruggedized PoE switch powering pan-tilt-zoom (PTZ) security cameras with heater elements and motor drives. IC Role / Device Role / Timing Role: High-power mode controller delivering 45W per port with foldback current limiting to sustain motor surge currents without tripping. Use Value: Prevents nuisance shutdowns during PTZ movement by tolerating >2× rated current for ≤70ms-maintaining video continuity during mechanical actuation. |
Use Scenario: DIN-rail mounted gateway aggregating sensor data from factory-floor devices powered via PoE. IC Role / Device Role / Timing Role: PSE controller with programmable UVLO (28.5V) and thermal shutdown (150°C) ensuring safe operation in uncooled enclosures. Use Value: Guarantees graceful shutdown before rail voltage collapse or ambient overheating-protecting connected sensors and preserving data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5965BEAX+ | Includes AC load disconnect detection (via OSC pin); otherwise identical pinout, register map, and electrical specs. | Required when detecting AC-coupled PD removal (e.g., in shared-media PoE systems with transformer-isolated ports). | Select MAX5965BEAX+ only if AC disconnect functionality is needed; MAX5965AEAX+T suffices for standard DC-coupled PoE deployments. |
| LTC4259AIDE#PBF | Quad PSE controller with IEEE 802.3af compliance only; no 802.3at support, no Class 5/6 classification, max 15.4W/port. | Suitable for cost-sensitive, low-power applications (e.g., basic VoIP phones) but cannot support 45W PDs or 2-event classification. | Choose LTC4259AIDE#PBF only for legacy 802.3af-only systems where high-power PoE is unnecessary and BOM cost is primary constraint. |
Compared with MAX5965BEAX+, the MAX5965AEAX+T omits AC disconnect circuitry-reducing external component count and simplifying layout-while retaining full 45W per port capability and identical software compatibility. Against LTC4259AIDE#PBF, it delivers triple the per-port power and adds critical 802.3at features essential for modern high-performance PoE infrastructure.
Availability
MAX5965AEAX+T is available at Aetrix Electronics and suitable for enterprise switches, midspan power injectors, and outdoor network camera systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX5965AEAX+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 communications, computing, and industrial markets.
The MAX5965A/B product line was designed specifically for IEEE-compliant Power over Ethernet power-sourcing equipment, targeting compact, high-reliability PSE implementations in switches, injectors, and edge infrastructure.
FAQ
What is the maximum per-port power supported by the MAX5965AEAX+T?
The MAX5965AEAX+T supports up to 45W per port in high-power mode, meeting IEEE 802.3at Type 2 (PoE+) requirements. This is achieved through programmable current-limit thresholds (e.g., 220mV with 0.5Ω sense resistor yielding ~440mA), foldback limiting, and robust thermal management-enabling reliable delivery to high-power PDs like PTZ cameras and dual-band APs without external components.
Does the MAX5965AEAX+T support IEEE 802.3at (PoE+) classification?
Yes, the MAX5965AEAX+T supports Class 5 and 2-event classification (Class 6), fully complying with IEEE 802.3at requirements. It performs two-stage detection and classification within ≤23ms per port, identifying high-power PDs capable of drawing up to 34.2W. The device's register-mapped classification engine allows software-controlled assignment of Class 0–5 and 2-event signatures-essential for dynamic power allocation in intelligent PSE systems.
How does the MAX5965AEAX+T handle overcurrent protection?
The MAX5965AEAX+T implements dual-stage overcurrent protection: a startup-time-limited threshold (VFLT_LIM = 32–488mV, configurable via ICUT bits) active for ≤70ms post-power-up, followed by a sustained current-limit clamp (VSU_LIM = 170–220mV). It also features foldback limiting-reducing trip voltage as VOUT rises-to prevent thermal runaway during prolonged overload. All thresholds are programmable via I²C, enabling precise tuning per port.
Can the MAX5965AEAX+T be used in midspan PSE applications?
Yes, the MAX5965AEAX+T supports midspan operation via the MIDSPAN pin, which configures the device to drive power onto spare pairs (pins 4–5 and 7–8) rather than signal pairs. Its 36-pin SSOP package, extended temperature range (-40°C to +85°C), and built-in DC load disconnect detection make it ideal for standalone midspan injectors. The device also includes midspan-specific timing (tDMID = 2.0–2.4s) and detection delay optimizations per IEEE 802.3af Annex 3A.
What interfaces does the MAX5965AEAX+T use for configuration and monitoring?
The MAX5965AEAX+T uses an I²C-compatible 3-wire serial interface (SCL, SDAIN, SDAOUT) for full software configurability-including port mode (auto/semi-auto/manual), current limits, timeouts, and fault responses. It provides instantaneous readout of port current via its 9-bit ADC (1mV LSB, ±1.5LSB INL), along with real-time status registers. An open-drain INT pin signals faults (overcurrent, overtemp, UVLO), enabling hardware-triggered diagnostics without polling.
MAX5965AEAX+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MAX5965AEAX+T FAQ
1.How can I place an order for MAX5965AEAX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5965AEAX+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 MAX5965AEAX+T reliable?
The price and inventory of MAX5965AEAX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5965AEAX+T is usually 5 days.
3.What payment methods are accepted for MAX5965AEAX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5965AEAX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5965AEAX+T?
MAX5965AEAX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5965AEAX+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 MAX5965AEAX+T?
For technical support, including MAX5965AEAX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5965AEAX+T requirements.
6.How does Aetrix verify that MAX5965AEAX+T is sourced from the original manufacturer or authorized distributors?
All MAX5965AEAX+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 MAX5965AEAX+T meets industry standards.
7.What is the process for return or replacement of MAX5965AEAX+T?
All MAX5965AEAX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5965AEAX+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 MAX5965AEAX+T part is unused and in its original packaging.
Return procedure for MAX5965AEAX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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