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Analog Devices Inc. LTC4266AIUHF-1#TRPBF
- Part No.:
- LTC4266AIUHF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC4266AIUHF-1#TRPBF.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
LTC4266AIUHF-1#TRPBF from Analog Devices is a quad-channel LTPoE++ Power Sourcing Equipment (PSE) controller delivering up to 38.7W per port over Ethernet, compliant with IEEE 802.3at Type 1/2 and featuring proprietary 4-point PD detection, 14-bit current monitoring ADCs, and I²C interface up to 1 MHz. It enables high-reliability midspan or endpoint PoE systems for IP cameras, wireless access points, and industrial IoT edge nodes.
For engineers reviewing the LTC4266AIUHF-1#TRPBF datasheet, LTC4266AIUHF-1#TRPBF pinout, LTC4266AIUHF-1#TRPBF application, or LTC4266AIUHF-1#TRPBF equivalent, key selection criteria include LTPoE++ 38.7W power grade, 0.25Ω sense resistor support, -40°C to +85°C operation, 38-lead 5mm × 7mm QFN package, and dual-mode forced-voltage/forced-current detection robustness against false PD identification.
Technical Context
The LTC4266AIUHF-1#TRPBF implements a fully autonomous or host-controlled quad PSE architecture with independent per-port gate drivers, current-sense amplifiers, and voltage monitors. Its detection logic executes sequential forced-current and forced-voltage phases followed by signature resistance validation (15.5kΩ–32kΩ), ensuring compatibility with legacy 802.3af/at PDs while enabling secure LTPoE++ handshake.
Each channel integrates a 14-bit ADC for port current (30.5 µV/LSB resolution) and voltage (5.835 mV/LSB), DAC-programmable current limit (VLIM = 102–221 mV range), and fast pull-down gate driver (30 mA sink) for controlled shutdown. The I²C interface operates at 1 MHz with built-in watchdog timer (1.5–3 s) and interrupt-driven event reporting via open-drain INT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Port Power | 38.7W per port - supports LTPoE++ Class A (IEEE 802.3bt Type 3) applications with full backward compatibility. |
| Detection Method | Proprietary 4-point detection - combines 2-point forced voltage (7–9 V) and 2-point forced current (140–260 µA) for immunity to false PD triggers. |
| Current Sense | 0.25Ω external sense resistor - minimizes heat dissipation at high LTPoE++ currents; VCUT threshold = 4.5–4.88 mV/LSB. |
| I²C Interface | 1 MHz max clock - enables real-time port status polling and configuration without bus contention in multi-controller systems. |
| Operating Temp | –40°C to +85°C - qualified for industrial and outdoor networking equipment deployment. |
| Package | 38-lead 5mm × 7mm QFN with exposed VEE pad - provides low thermal resistance (θJA = 34°C/W) for sustained 38.7W/port operation. |
| Supply Range | VEE = –45V to –57V - supports standard PoE midspan and endpoint supply rails with undervoltage lockout at 25V. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed thermal pad connected to VEE (Pin 39). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pin 39) | Main negative PoE supply return | Connects to –45V to –57V rail; serves as reference for all analog sensing and gate drive; exposed pad must be soldered to PCB for thermal management. |
| GATE1–GATE4 (Pins 24, 27, 30, 33) | External MOSFET gate drivers | Drive N-channel MOSFET gates up to 14V above VEE; include 30 mA fast pull-down for rapid fault shutdown. |
| SENSE1–SENSE4 (Pins 23, 26, 29, 32) | Current sense inputs | Monitor voltage across 0.25Ω sense resistor between SENSEn and VEE; enable precise overcurrent (VCUT) and active current limit (VLIM) protection. |
| OUT1–OUT4 (Pins 1, 4, 7, 10) | Port output voltage monitors | Provide feedback for power-good detection (VPG = 2.4V threshold) and foldback control when VDS > 10V; internal 500kΩ pull-down when idle. |
| SHDN1–SHDN4 (Pins 11, 12, 13, 14) | Hardware port shutdown controls | Active-low pins allow immediate, register-bypass port disable; immune to <1µs glitches; internally pulled up to VDD. |
| SCL / SDAIN / SDAOUT (Pins 5, 6, 8) | I²C serial interface | SCL: 1 MHz clock input; SDAIN/SDAOUT: opto-isolation-friendly split bidirectional data lines; support standard I²C addressing (010A3A2A1A0b). |
| INT (Pin 15) | Open-drain interrupt output | Asserts low on port fault, detection completion, or classification event; requires external pull-up; updated only between I²C transactions. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent PSE channels | Enables 4-port PoE switch/midspan designs without channel crosstalk; each port has dedicated GATE/SENSE/OUT and fault isolation. |
| LTPoE++ 38.7W power grade | Delivers IEEE 802.3bt-compliant power with mutual PSE/PD identification-ensures safe interoperability with legacy 802.3af/at PDs. |
| 14-bit current & voltage monitoring | Provides ±0.1% full-scale accuracy for real-time power budgeting, thermal management, and remote diagnostics in managed switches. |
| Dual-mode 4-point PD detection | Eliminates false positives from capacitive loads or ESD events by requiring both voltage and current signature validation before power application. |
| Fast gate pull-down (30 mA) | Reduces MOSFET turn-off time to <6.5 µs during overcurrent, minimizing energy dissipation and preventing thermal runaway in fault conditions. |
| Midspan backoff timer (2.3–2.7 s) | Prevents bus contention in multi-PSE midspan deployments by enforcing staggered detection retry intervals after failed handshakes. |
Applications
| IP Surveillance Cameras | Enterprise Wireless Access Points |
|---|---|
|
Use Scenario: Outdoor PTZ camera with heater, fan, and IR illuminator requiring >25W continuous power over single Cat5e cable. IC Role / Device Role / Timing Role: Quad-channel PSE controller managing four concurrent PoE links with independent current limiting and thermal foldback. Use Value: Enables 38.7W delivery per port using standard cabling-eliminates need for local AC adapters while maintaining IEEE 802.3at interoperability. |
Use Scenario: Dual-band 802.11ac AP with integrated Bluetooth and USB peripherals deployed in office ceiling grids. IC Role / Device Role / Timing Role: LTPoE++ PSE providing deterministic power-up sequencing and MPS maintenance for uninterrupted Wi-Fi uptime. Use Value: Supports maintain-power-signature (MPS) dropout time of 350 ms-ensures zero-interruption operation during transient load surges. |
| Industrial IoT Gateways | Smart Building Controllers |
|
Use Scenario: DIN-rail mounted gateway aggregating Modbus, CAN, and Zigbee sensors in factory automation networks. IC Role / Device Role / Timing Role: Robust PSE interface with -40°C to +85°C rating and 38-lead QFN for conduction-cooled enclosures. Use Value: Delivers stable 38.7W under wide temperature swings-avoids derating or forced cooling in uncontrolled environments. |
Use Scenario: HVAC controller powering actuator modules, occupancy sensors, and display panels via structured cabling. IC Role / Device Role / Timing Role: Four-channel PSE with hardware SHDN pins enabling zone-based power cycling without host processor intervention. Use Value: Reduces BOM count by integrating detection, classification, current limiting, and I²C telemetry into single IC per port. |
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 LAN9355I-ABZ | Integrated 5-port 10/100 Ethernet switch + dual PSE; supports only 25.5W (802.3at); no LTPoE++ or 38.7W capability. | Targeted at cost-sensitive SOHO switches where integrated PHY+MAC reduces footprint; lacks standalone PSE flexibility. | Select when needing embedded switching + basic PoE+, not discrete high-power PSE control. |
| Analog Devices LTC4267IUHF#TRPBF | Single-channel LTPoE++ PSE controller; identical 38.7W rating, same pin-compatible QFN package, but only one port. | Used in modular or distributed PSE architectures where per-port ICs simplify thermal layout and fault containment. | Select when designing scalable, hot-swappable PSE blades or requiring per-port isolation beyond quad integration. |
Compared with LTC4266AIUHF-1#TRPBF, LAN9355I-ABZ trades off power capability and flexibility for integration density, while LTC4267IUHF#TRPBF offers identical per-port performance in a single-channel form factor-enabling modular thermal management and redundancy in carrier-grade systems.
Availability
LTC4266AIUHF-1#TRPBF is available at Aetrix Electronics and suitable for IP surveillance systems, enterprise wireless infrastructure, industrial IoT gateways, smart building controllers, and PoE midspan power supplies requiring stable component supply across extended product lifecycles.
Supply support for LTC4266AIUHF-1#TRPBF 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4266A family was designed specifically for high-reliability, multi-port Power over Ethernet PSE applications-emphasizing LTPoE++ interoperability, precise current monitoring, and robust fault handling in demanding network infrastructure.
FAQ
What is the maximum power delivery capability of the LTC4266AIUHF-1#TRPBF?
The LTC4266AIUHF-1#TRPBF is rated for up to 38.7W per port, corresponding to LTPoE++ Class A (IEEE 802.3bt Type 3) compliance. This rating assumes use of 0.25Ω sense resistors, –54V VEE supply, and proper thermal management via the exposed QFN pad. It maintains full backward compatibility with IEEE 802.3af (13W) and 802.3at (25.5W) powered devices.
Does the LTC4266AIUHF-1#TRPBF support midspan and endpoint PSE configurations?
Yes, the LTC4266AIUHF-1#TRPBF supports both configurations via the MID pin: when pulled high, it operates as a midspan PSE; when low, it functions as an endpoint. Its midspan backoff timer (2.3–2.7 s) prevents bus contention in multi-unit deployments, and its AUTO pin mode enables autonomous operation without host controller intervention.
How does the 4-point PD detection in the LTC4266AIUHF-1#TRPBF improve reliability?
The LTC4266AIUHF-1#TRPBF uses sequential forced-voltage (7–9 V) and forced-current (140–260 µA) detection steps, followed by signature resistance validation (15.5kΩ–32kΩ), to eliminate false positives from capacitive loads or ESD transients. This ensures only valid IEEE-compliant or LTPoE++-certified PDs receive power-critical for mission-critical infrastructure.
Can the LTC4266AIUHF-1#TRPBF be used with 0.5Ω current sense resistors?
Yes, the LTC4266AIUHF-1#TRPBF supports both 0.25Ω and 0.5Ω external sense resistors. When using 0.5Ω, the overcurrent threshold VCUT scales accordingly (e.g., 9 mV/LSB becomes 4.5 mV/LSB in cutrng=1 mode), preserving measurement resolution while increasing voltage drop-requiring careful thermal design for 38.7W operation.
What is the role of the SDAOUT and SDAIN pins on the LTC4266AIUHF-1#TRPBF?
The LTC4266AIUHF-1#TRPBF splits the I²C SDA line into SDAOUT (open-drain output) and SDAIN (high-impedance input) to simplify opto-isolation in high-noise industrial PoE systems. For standard non-isolated use, tie SDAOUT and SDAIN together externally; leave SDAOUT floating or grounded if unused, and tie SDAIN high if unused.
LTC4266AIUHF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 38.7 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-1#TRPBF FAQ
1.How can I place an order for LTC4266AIUHF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4266AIUHF-1#TRPBF 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-1#TRPBF reliable?
The price and inventory of LTC4266AIUHF-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4266AIUHF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4266AIUHF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4266AIUHF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4266AIUHF-1#TRPBF?
LTC4266AIUHF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4266AIUHF-1#TRPBF 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-1#TRPBF?
For technical support, including LTC4266AIUHF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4266AIUHF-1#TRPBF requirements.
6.How does Aetrix verify that LTC4266AIUHF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4266AIUHF-1#TRPBF 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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4266AIUHF-1#TRPBF?
All LTC4266AIUHF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4266AIUHF-1#TRPBF, 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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4266AIUHF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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