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Analog Devices Inc./Maxim Integrated MAX5965BUAX+T
- Part No.:
- MAX5965BUAX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
MAX5965BUAX+T.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,586
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Product details
Overview
MAX5965BUAX+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. It performs powered device (PD) detection, classification (including Class 5 and 2-event Class 6), current limiting, and DC/AC load disconnect detection across four independent ports. Designed for midspan injectors and Ethernet switches, it delivers up to 45W per port in high-power mode.
For engineers reviewing the MAX5965BUAX+T datasheet, MAX5965BUAX+T pinout, MAX5965BUAX+T application, or MAX5965BUAX+T equivalent, key selection criteria include AC disconnect capability (enabled in MAX5965B variant), I²C-programmable current limits, instantaneous per-port current readout, thermal/overvoltage/undervoltage protection, and support for legacy high-capacitance PDs.
Technical Context
The MAX5965BUAX+T implements a fully software-configurable PSE state machine with four operating modes: Auto, Semi-Auto, Manual, and Shutdown - enabling flexible system-level power management. Its integrated 9-bit ADC enables real-time SENSE_ voltage monitoring for precise current measurement and foldback-controlled current limiting.
It features dual-stage PD detection (3.8–4.2V and 9.0–9.6V probe voltages), programmable startup/fault/restart timers, and hardware-based safety checks including load-stability verification during detection and open-circuit/short-circuit fault detection. The AC disconnect function - exclusive to MAX5965B variants - uses an external 100Hz oscillator input (OSC pin) and internal gain stage (2.9–3.1 V/V) to detect AC load removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | IEEE 802.3af-compliant and 802.3at-compatible PSE controller - ensures interoperability with standard PoE PDs including Class 0–5 and 2-event Class 6 devices. |
| Port Count & Power | Four independent -48V PSE ports; high-power mode supports up to 45W per port - enables deployment in high-power PoE++ systems. |
| AC Disconnect | Enabled (MAX5965B variant only); requires 100Hz ±10%, 2VP-P ±5%, +1.3V offset sine wave on OSC pin - detects AC load removal for legacy PDs without DC disconnect signaling. |
| Current Sensing | 9-bit ADC with 1mV LSB resolution and ±1.5 LSB INL - provides accurate, instantaneous per-port current readout via I²C interface for real-time power budgeting. |
| Protection Features | VEE UVLO (28.5V), VEE OVLO (62.5V), thermal shutdown (+150°C), PGOOD monitoring, and programmable overcurrent timeout (50–70ms default) - ensures robust fault containment in telecom and industrial environments. |
| Interface | I²C-compatible 3-wire serial interface (SCL/SDAIN/SDAOUT, 400kHz Fast Mode) - enables full software configuration of detection thresholds, timing, classification behavior, and fault responses. |
| Operating Temp | 0°C to +85°C ambient (UAX grade) - qualified for commercial-temperature Ethernet infrastructure applications including switches and midspan injectors. |
Pinout & Package
MAX5965BUAX+T is housed in a 36-pin SSOP package (body size 9.9mm × 3.9mm, 0.635mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DET1–DET4 | PD Detection/Classification Voltage Output | Generates controlled probe voltages (3.8–4.2V, 9.0–9.6V) for IEEE-compliant 2-phase PD detection and classification on each port. |
| SENSE1–SENSE4 | Current-Sense Negative Input | Connects to MOSFET source; measures voltage drop across external sense resistor (e.g., 0.5Ω) to enforce current limit and enable ADC-based current readout. |
| GATE1–GATE4 | External MOSFET Gate Driver | Drives N-channel MOSFET gates with 10V gate overdrive (typical) and internal 11.4V clamp - ensures reliable FET turn-on while preventing gate oxide damage. |
| OUT1–OUT4 | Drain Voltage Sense Input | High-impedance input (≤2µA leakage) senses MOSFET drain voltage for PGOOD generation, short-circuit detection, and load stability checking. |
| OSC | AC Disconnect Oscillator Input | Accepts 100Hz sine wave for AC load removal detection (MAX5965B only); failsafe shutdown if signal falls below 1.8V threshold. |
| SHD1–SHD4 | Hardware Port Shutdown | Active-low inputs with internal 50kΩ pullup to VDD - allow immediate, software-independent port disable for safety-critical fault handling. |
| INT | Open-Drain Fault Interrupt | Asserts low on any fault (overcurrent, overtemp, UV/OV, disconnect); supports wired-OR interrupt aggregation across multiple PSE controllers. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Event Classification Support | Enables detection and classification of IEEE 802.3at Class 4 and Class 5 PDs using two sequential current signatures - required for high-power PoE++ compatibility. |
| 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 fault conditions. |
| DC & AC Load Disconnect Detection | DC disconnect triggers at 2.5–5.0mV SENSE_ drop; AC disconnect uses OSC input and internal 285–360µA current threshold - covers both modern and legacy PD disconnection methods. |
| Selectable Load-Stability Safety Check | Verifies stable PD signature during detection phase by monitoring DET_ current consistency - rejects false positives from capacitive transients or noisy lines. |
| Four Independent Operating Modes | Auto (fully autonomous), Semi-Auto (detection auto, power-up software-gated), Manual (full register control), and Shutdown (all ports disabled) - simplifies integration across diverse system architectures. |
Applications
| Power-Sourcing Switches | Midspan Power Injectors |
|---|---|
|
Use Scenario: 24- or 48-port Ethernet switch integrating inline PoE delivery to IP phones, wireless APs, and security cameras. IC Role / Device Role / Timing Role: Quad PSE controller managing four 10/100/1000BASE-T ports per IC; handles detection, classification, and power ramp-up per IEEE 802.3af/at timing windows. Use Value: Enables compact, thermally efficient switch design with per-port current monitoring and fast (<70ms) overcurrent response - critical for maintaining IEEE compliance under dynamic load conditions. |
Use Scenario: Standalone 8-port midspan injector adding PoE capability between non-PoE switch and remote PDs in enterprise or industrial settings. IC Role / Device Role / Timing Role: Primary PSE controller implementing endpoint-mode detection and high-power classification; supports midspan mode via MIDSPAN pin configuration. Use Value: Delivers up to 45W/port with AC disconnect for legacy PDs, reducing need for separate DC disconnect circuitry and lowering BOM cost versus discrete solutions. |
| Industrial Ethernet Routers | Smart Building Controllers |
|
Use Scenario: Ruggedized outdoor router powering surveillance cameras, environmental sensors, and access control readers over long cable runs. IC Role / Device Role / Timing Role: High-reliability PSE controller with extended temperature range (0°C to +85°C), VEE UVLO hysteresis (3V), and thermal shutdown (+150°C). Use Value: Ensures uninterrupted operation in harsh environments via robust overvoltage (62.5V), undervoltage (28.5V), and overtemperature protection - minimizing field failures. |
Use Scenario: Central building management unit supplying PoE to occupancy sensors, lighting controllers, and HVAC actuators across distributed zones. IC Role / Device Role / Timing Role: Software-configurable PSE enabling centralized power budgeting, remote fault diagnostics, and dynamic class reassignment via I²C interface. Use Value: Supports energy-efficient operation through instantaneous current readout and programmable restart timers - allows predictive maintenance and optimized power allocation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5965BEAX+ | Same functionality and pinout, but rated for -40°C to +85°C extended temperature range; no AC disconnect difference - identical OSC-based AC disconnect capability. | Suitable for industrial or outdoor deployments requiring wider thermal margin; not required for commercial indoor infrastructure. | Select MAX5965BEAX+ when ambient operating temperature may fall below 0°C; otherwise MAX5965BUAX+T offers cost-optimized commercial-grade performance. |
| LTC4259AIDE#PBF | Quad PSE controller with IEEE 802.3af compliance only; no 802.3at Class 5/6 support, no AC disconnect, no I²C current readout, and fixed 15.4W/port limit. | Applicable only to legacy 802.3af systems; lacks high-power mode, programmable classification, and real-time current monitoring. | Choose LTC4259AIDE#PBF only for cost-sensitive, low-power (≤15.4W/port) designs where future PoE++ upgrade is not anticipated. |
Compared with MAX5965BEAX+, MAX5965BUAX+T trades extended temperature range for lower cost in commercial environments, while both retain full AC disconnect and 45W/port capability; compared with LTC4259AIDE#PBF, MAX5965BUAX+T adds 802.3at compatibility, programmable current limits, and real-time diagnostics - essential for scalable, future-proof PoE infrastructure.
Availability
MAX5965BUAX+T is available at Aetrix Electronics and suitable for power-sourcing switches, midspan injectors, and industrial Ethernet routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX5965BUAX+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 analog and mixed-signal ICs for power management, interface, sensing, and communication applications.
The MAX5965A/MAX5965B product line was designed specifically for high-reliability, software-configurable Power over Ethernet power-sourcing equipment - targeting next-generation switches, midspans, and infrastructure gear needing IEEE 802.3at compatibility and advanced diagnostics.
FAQ
What distinguishes MAX5965BUAX+T from the MAX5965AUAX+?
The MAX5965BUAX+T and MAX5965AUAX+ share identical pinout, package, and commercial temperature range (0°C to +85°C), but differ in AC disconnect capability: MAX5965BUAX+T supports AC load disconnect detection via the OSC pin, while MAX5965AUAX+ does not. This makes MAX5965BUAX+T suitable for legacy PDs lacking DC disconnect signaling.
Does MAX5965BUAX+T support IEEE 802.3at Type 2 (PoE++)?
Yes, MAX5965BUAX+T supports IEEE 802.3at Type 2 via its high-power mode (up to 45W/port) and 2-event classification (Class 5 and Class 6). It detects and classifies high-power PDs using dual-current signatures and enforces current limits per 802.3at requirements - confirmed in the device's functional description and selector guide.
How is per-port current measured and reported in MAX5965BUAX+T?
MAX5965BUAX+T uses an internal 9-bit ADC to digitize the SENSE_ voltage (representing MOSFET source current), providing instantaneous current readout via its I²C interface. With 1mV LSB resolution and ±1.5 LSB INL, it delivers accurate real-time current data for each of the four ports - enabling precise power budgeting and fault diagnostics.
Can MAX5965BUAX+T operate in midspan mode?
Yes, MAX5965BUAX+T supports midspan mode via the MIDSPAN pin: pulling MIDSPAN high configures the device for midspan PSE operation (power injection on spare pairs), while leaving it unconnected or low defaults to endpoint mode. The datasheet confirms midspan detection delay (tDMID = 2.0–2.4s) and associated timing behavior.
What protection features are integrated into MAX5965BUAX+T?
MAX5965BUAX+T integrates VEE undervoltage lockout (28.5V), VEE overvoltage lockout (62.5V), thermal shutdown (+150°C), PGOOD monitoring, open-circuit/short-circuit detection, and programmable overcurrent timeout. These protections are hardware-enforced and operate independently of software control - ensuring fail-safe operation in mission-critical PoE infrastructure.
MAX5965BUAX+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:
- Obsolete
- 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:
- 0°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
MAX5965BUAX+T FAQ
1.How can I place an order for MAX5965BUAX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5965BUAX+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 MAX5965BUAX+T reliable?
The price and inventory of MAX5965BUAX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5965BUAX+T is usually 5 days.
3.What payment methods are accepted for MAX5965BUAX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5965BUAX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5965BUAX+T?
MAX5965BUAX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5965BUAX+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 MAX5965BUAX+T?
For technical support, including MAX5965BUAX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5965BUAX+T requirements.
6.How does Aetrix verify that MAX5965BUAX+T is sourced from the original manufacturer or authorized distributors?
All MAX5965BUAX+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 MAX5965BUAX+T meets industry standards.
7.What is the process for return or replacement of MAX5965BUAX+T?
All MAX5965BUAX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5965BUAX+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 MAX5965BUAX+T part is unused and in its original packaging.
Return procedure for MAX5965BUAX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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