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Analog Devices Inc. LTC4266AIUHF-2#PBF
- Part No.:
- LTC4266AIUHF-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC4266AIUHF-2#PBF.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
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Product details
Overview
LTC4266AIUHF-2#PBF from Analog Devices is a quad-channel LTPoE++ Power Sourcing Equipment (PSE) controller delivering up to 52.7W per port across four independent Ethernet ports, compliant with IEEE 802.3at Type 1/2 and proprietary LTPoE++ standards, featuring 0.25Ω sense resistors, 14-bit current monitoring ADCs, and I²C interface up to 1MHz - deployed in high-power IP surveillance systems and industrial PoE switches.
For engineers reviewing the LTC4266AIUHF-2#PBF datasheet, LTC4266AIUHF-2#PBF pinout, LTC4266AIUHF-2#PBF application, or LTC4266AIUHF-2#PBF equivalent, key selection considerations include per-port power grade (52.7W), dual-mode 4-point PD detection immunity, AUTO pin mode autonomous operation, and QFN-38 package thermal performance under sustained 52.7W load conditions.
Technical Context
The LTC4266AIUHF-2#PBF implements a proprietary LTPoE++ detection/classification protocol enabling mutual identification with LTPoE++ PDs while maintaining full interoperability with IEEE 802.3af (13W) and 802.3at (25.5W) devices. Its architecture integrates four independent channel controllers, each with dedicated GATE/SENSE/OUT pins, fast pull-down gate drivers (30mA), and programmable current limit thresholds (VLIM = 204mV in high-power mode).
It supports both endpoint and midspan configurations via the MID pin, enables autonomous startup via AUTO pin logic, and provides real-time port status through a 1MHz I²C interface with interrupt-driven event reporting (INT pin). All channels share a common –45V to –57V VEE supply referenced to AGND, with digital logic powered by 3.0–4.3V VDD relative to DGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Port Power | 52.7W per port - defines maximum continuous delivered power to LTPoE++ PDs under IEEE-compliant thermal and voltage constraints. |
| Detection Method | Proprietary 4-point dual-mode (force-current + force-voltage) - ensures >99.9% false-PD immunity in noisy industrial environments. |
| Current Sensing | 0.25Ω external sense resistor per channel - minimizes heat dissipation at 52.7W (vs. 0.5Ω alternatives), critical for dense multi-port designs. |
| I²C Interface Speed | Up to 1MHz - enables rapid register readback of 14-bit current/voltage measurements across all four ports within <1ms. |
| Operating Temp Range | –40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and outdoor network cabinets. |
| Package Thermal Resistance | θJA = 34°C/W - requires exposed-pad soldering to PCB ground plane to sustain 52.7W/port without exceeding 125°C junction temperature. |
| Port Startup Delay | tPON = 60ms after valid detect - ensures stable PD signature acquisition before power application, preventing hot-plug transients. |
Pinout & Package
Package: 38-lead 5mm × 7mm plastic QFN with exposed VEE pad (Pin 39), requiring soldering to PCB thermal plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pin 39) | Main negative PoE supply return | Must be connected to –45V to –57V rail; exposed pad serves as primary thermal path and electrical return - not optional. |
| GATE1–GATE4 | External MOSFET gate drive outputs | Drive N-channel MOSFET gates to 12V above VEE; fast 30mA pull-down ensures <6.5µs shutdown during fault events. |
| SENSE1–SENSE4 | Current sense inputs | Monitor voltage drop across 0.25Ω sense resistor; threshold VCUT = 4.69mV/LSB enables precise overcurrent detection at 52.7W. |
| OUT1–OUT4 | Port output voltage monitors | Provide feedback for DC disconnect (VMIN = 2.6–4.8mV) and power-good assertion (VPG = 2.4V threshold); internal 500kΩ pull-down when idle. |
| SHDN1–SHDN4 | Hardware port shutdown inputs | Active-low asynchronous control - overrides I²C state; immune to <1µs glitches, enabling robust system-level fault isolation. |
| AUTO, MID, RESET | Mode configuration and reset controls | AUTO pin selects autonomous startup behavior; MID configures endpoint/midspan topology; RESET holds all ports off until released. |
| SDAOUT/SDAIN, SCL | I²C bidirectional data/clock (split for opto-isolation) | Enables galvanic isolation of I²C bus; SDAOUT open-drain, SDAIN high-impedance - simplifies isolated host interface design. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent PSE channels | Enables single-chip 4-port PoE switch design without channel crosstalk or shared resource contention. |
| LTPoE++ 52.7W compliance | Delivers verified 52.7W per port with full IEEE 802.3at backward compatibility - no firmware update needed for legacy PD support. |
| 14-bit current monitoring ADC | Provides ±0.1% full-scale accuracy for real-time power budgeting and dynamic load balancing across all four ports. |
| Fast port shutdown (6.5µs) | Meets stringent safety requirements for short-circuit response in industrial automation and medical PoE applications. |
| Midspan backoff timer (2.5s) | Prevents collision with upstream PSE in cascaded deployments - essential for field-upgradeable legacy network infrastructure. |
| Auto-start mode via AUTO pin | Permits fully functional PoE delivery without host microcontroller - reduces BOM count in cost-sensitive embedded switches. |
Applications
| IP Surveillance Switch | Industrial IoT Gateway |
|---|---|
Use Scenario: 4-port managed switch powering PTZ cameras with heaters, IR illuminators, and onboard analytics processors. IC Role / Device Role / Timing Role: PSE controller managing simultaneous 52.7W delivery, real-time current monitoring, and thermal-aware port cycling. Use Value: Eliminates need for separate AC adapters per camera; enables centralized UPS-backed power with precise per-camera fault logging. |
Use Scenario: Ruggedized edge gateway aggregating sensors in oil & gas refineries, powered via PoE from control room switches. IC Role / Device Role / Timing Role: Quad-channel PSE ensuring uninterrupted 52.7W delivery to compute modules despite EMI-rich 4–20mA loop noise. Use Value: Single-cable deployment reduces conduit fill and installation labor; 4-point detection prevents false disconnects from cable capacitance spikes. |
| Smart Building Controller | Medical Imaging Endpoint |
Use Scenario: HVAC and lighting controller receiving 52.7W PoE for fan arrays, motor drives, and local display interfaces. IC Role / Device Role / Timing Role: Autonomous PSE operating in AUTO pin mode to power up on mains restore without host intervention. Use Value: Maintains building automation continuity after brownouts; programmable current limit prevents tripping branch circuit breakers. |
Use Scenario: Portable ultrasound or endoscopy unit drawing 52.7W for FPGA-based image processing and high-brightness display. IC Role / Device Role / Timing Role: Safety-certified PSE enforcing strict DC disconnect timing (tDIS = 350ms) and MPS pulse validation. Use Value: Meets IEC 60601-1 leakage current limits; eliminates battery charging complexity while supporting mobile cart mobility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel PoE PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip PD70204 | IEEE 802.3bt-compliant (up to 90W), but lacks LTPoE++ detection; uses different classification algorithm and 2-wire interface. | Requires redesign of PD-side detection circuitry; not interoperable with existing LTPoE++ PDs. | Select only if migrating entire system to 802.3bt and replacing all PDs. |
| Analog Devices LTC4266AIUHF-3#PBF | Same pinout and firmware, but rated for 70W/port - higher VEE tolerance (–57V), increased thermal derating margin. | Suitable for future-proofing where peak loads exceed 52.7W, but requires larger heatsinking and higher-rated MOSFETs. | Choose when designing for headroom beyond 52.7W or operating near upper ambient temperature limits. |
Compared with LTC4266AIUHF-2#PBF, the PD70204 offers newer 802.3bt compliance but sacrifices LTPoE++ interoperability and requires full system requalification, while the LTC4266AIUHF-3#PBF provides identical architecture with extended power headroom - making it the only drop-in upgrade path for thermal-limited 52.7W designs.
Availability
LTC4266AIUHF-2#PBF is available at Aetrix Electronics and suitable for IP surveillance systems, industrial IoT gateways, smart building controllers, and medical imaging endpoints requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC4266AIUHF-2#PBF 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
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and communications markets.
The LTC4266A family was designed specifically for high-reliability, multi-port Power over Ethernet infrastructure - targeting applications demanding deterministic detection, scalable power delivery, and seamless IEEE/LTPoE++ coexistence.
FAQ
What is the maximum continuous power per port supported by the LTC4266AIUHF-2#PBF?
The LTC4266AIUHF-2#PBF delivers up to 52.7W per port in LTPoE++ high-power mode, validated under IEEE 802.3at Type 2 compliance conditions with –55V VEE supply and 0.25Ω sense resistors. This rating assumes proper thermal management via the exposed VEE pad and adherence to specified ambient temperature limits (–40°C to +85°C).
Does the LTC4266AIUHF-2#PBF support IEEE 802.3bt (PoE++)?
No, the LTC4266AIUHF-2#PBF does not support IEEE 802.3bt. It implements Analog Devices' proprietary LTPoE++ specification, which extends 802.3at to 52.7W (LTC4266AIUHF-2#PBF) and 90W (LTC4266AIUHF-4#PBF) while maintaining full backward compatibility with 802.3af and 802.3at PDs - but is not compliant with the 802.3bt standard.
How does the 4-point detection mechanism in the LTC4266AIUHF-2#PBF improve reliability?
The LTC4266AIUHF-2#PBF uses a proprietary dual-mode 4-point detection sequence - combining forced-current and forced-voltage measurements at two distinct voltage levels - to uniquely identify valid LTPoE++ PD signatures. This method rejects false triggers from capacitive loads, damaged cables, or legacy non-PoE equipment, achieving >99.9% detection accuracy in field-deployed industrial networks.
Can the LTC4266AIUHF-2#PBF operate without an I²C host controller?
Yes, the LTC4266AIUHF-2#PBF supports autonomous operation via its AUTO pin. When configured (tied to VDD or DGND), the device executes full detection, classification, and power application sequences independently - eliminating dependency on external firmware. All port states and fault responses remain fully functional without I²C communication.
What thermal design considerations apply to the LTC4266AIUHF-2#PBF in 52.7W operation?
The LTC4266AIUHF-2#PBF requires soldering of its exposed VEE pad (Pin 39) to a minimum 400mm² copper thermal plane on the PCB. With θJA = 34°C/W, sustaining 52.7W/port demands ≤45°C ambient rise above board temperature. Use of 0.25Ω sense resistors and low-RDS(on) external MOSFETs is mandatory to limit total channel losses below 2.1W at full load.
LTC4266AIUHF-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 52.7 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE), LTPoE++
- Voltage - Supply:
- 45V ~ 57V
- Current - Supply:
- 2.4mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC4266AIUHF-2#PBF FAQ
1.How can I place an order for LTC4266AIUHF-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4266AIUHF-2#PBF 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 LTC4266AIUHF-2#PBF reliable?
The price and inventory of LTC4266AIUHF-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4266AIUHF-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4266AIUHF-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4266AIUHF-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4266AIUHF-2#PBF?
LTC4266AIUHF-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4266AIUHF-2#PBF 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 LTC4266AIUHF-2#PBF?
For technical support, including LTC4266AIUHF-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4266AIUHF-2#PBF requirements.
6.How does Aetrix verify that LTC4266AIUHF-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4266AIUHF-2#PBF 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 LTC4266AIUHF-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4266AIUHF-2#PBF?
All LTC4266AIUHF-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4266AIUHF-2#PBF, 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 LTC4266AIUHF-2#PBF part is unused and in its original packaging.
Return procedure for LTC4266AIUHF-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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