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Analog Devices Inc. LTC4266CIUHF#TRPBF
- Part No.:
- LTC4266CIUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC4266CIUHF#TRPBF.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,175
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Product details
Overview
LTC4266CIUHF#TRPBF from Analog Devices is a quad-channel IEEE 802.3af Type 1 Power Sourcing Equipment (PSE) controller delivering up to 13W per port, featuring 0.25Ω sense resistors, 14-bit current monitoring ADCs, and I²C interface operable up to 1MHz. It supports fully automatic PoE deployment in midspan and endpoint applications for IP phones, wireless access points, and security cameras.
For engineers reviewing the LTC4266CIUHF#TRPBF datasheet, LTC4266CIUHF#TRPBF pinout, LTC4266CIUHF#TRPBF application, or LTC4266CIUHF#TRPBF equivalent, key selection criteria include its 13W per-port power grade, 38-lead 5mm × 7mm QFN package with exposed VEE pad, dual-mode 4-point PD detection, and compatibility with legacy 802.3af infrastructure without host microcontroller dependency in AUTO pin mode.
Technical Context
The LTC4266CIUHF#TRPBF implements a proprietary 4-point detection scheme-combining forced-voltage and forced-current steps-to achieve high immunity against false PD detection while maintaining full interoperability with IEEE 802.3af Type 1 (13W) powered devices. Its analog front-end includes dedicated SENSE/GATE/OUT pins per channel and integrated DC disconnect sensing at 2.6–4.8mV threshold.
It operates with a negative main supply (VEE = –45V to –57V referenced to AGND), uses DGND-referenced digital logic, and supports both autonomous operation via the AUTO pin and host-controlled configuration via I²C. The device integrates 14-bit ADCs for port current/voltage readback with 30.5µV/LSB and 5.835mV/LSB resolution respectively, plus 50Hz/60Hz noise rejection of 30dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Port Power | 13W per port - compliant with IEEE 802.3af Type 1; enables powering VoIP phones and low-power sensors without upgrade to PoE+ infrastructure. |
| Detection Method | 4-point dual-mode (2× forced voltage + 2× forced current) - ensures robust PD signature validation and eliminates false triggers from capacitive loads or ESD events. |
| Sense Resistor | 0.25Ω per channel - minimizes heat dissipation at full load and enables accurate current measurement down to ±1mA resolution with integrated ADC. |
| I²C Interface | Up to 1MHz clock rate - supports fast register access for real-time port control, fault logging, and telemetry in dense switch deployments. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade Ethernet equipment operating in uncontrolled environments including outdoor enclosures and factory floors. |
| Package | 38-lead 5mm × 7mm QFN with exposed VEE pad - provides low thermal resistance (θJA = 34°C/W) and direct heatsinking path for sustained 13W/port operation. |
| Supply Voltage | VEE = –45V to –57V (vs AGND); VDD = 3.0V to 4.3V (vs DGND) - supports standard PoE midspan and endpoint power architectures with isolated DC-DC conversion. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed thermal pad connected to VEE (Pin 39). Must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pin 39) | Main PoE supply return | Negative rail reference for all analog channels; exposed pad must be soldered to ground plane for thermal management and noise immunity. |
| SENSE1–SENSE4 | Current sense inputs | Monitor voltage drop across external 0.25Ω MOSFET source resistors; input range VEE–0.3V to VEE+80V enables high-side sensing. |
| GATE1–GATE4 | MOSFET gate drivers | Drive external N-channel MOSFETs with 12V typical gate swing above VEE; include fast pull-down (30mA) for rapid fault shutdown. |
| OUT1–OUT4 | Port output monitors | High-impedance feedback nodes tied to PoE output lines; internal 500kΩ pull-down when idle; trigger PG flag at 2.4V (typ) below VEE. |
| SHDN1–SHDN4 | Hardware port disable | Active-low independent shutdown controls; override software state; glitch-filtered (>1µs) to prevent spurious port cycling. |
| AD0–AD3 | I²C address bits | Set 5-bit slave address (010A3A2A1A0b); internally pulled up to VDD - allows up to 16 devices on same bus without address conflict. |
| SCL / SDAIN / SDAOUT | I²C interface | Separated SDA input/output pins simplify opto-isolation; SCL supports 1MHz max; open-drain outputs require external pull-ups to VDD. |
| AUTO | Autonomous mode select | Configures default port behavior on reset: tie to VDD for auto-detect-and-power, DGND for manual I²C control only. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent PSE channels | Enables single-chip 4-port PoE switch design with per-port current limiting, fault isolation, and independent status reporting - reduces BOM count vs discrete controllers. |
| IEEE 802.3af Type 1 compliance | Guarantees interoperability with certified 13W PDs including legacy VoIP handsets and IEEE-compliant surveillance cameras without firmware updates or negotiation overhead. |
| 14-bit current/voltage monitoring | Provides real-time telemetry with 30.5µV/LSB current sense resolution and 5.835mV/LSB port voltage resolution - supports predictive maintenance and energy auditing. |
| Proprietary 4-point PD detection | Eliminates false positives from cable capacitance, ESD transients, or floating ports - critical for field reliability in large-scale deployments with mixed PD fleets. |
| Midspan backoff timer | 2.3–2.7s delay after midspan detection prevents race conditions in cascaded PSE topologies - ensures deterministic power-up sequencing in multi-stage PoE systems. |
Applications
| VoIP Phone Deployment | Wireless Access Point Powering |
|---|---|
|
Use Scenario: Powering IEEE 802.3af-compliant desk phones in enterprise office networks using existing Cat5e cabling. IC Role / Device Role / Timing Role: Quad-channel PSE controller managing four concurrent phone ports with autonomous detection, classification, and power delivery. Use Value: Eliminates need for local AC adapters; enables centralized UPS-backed power; supports remote port reset and power cycling via I²C. |
Use Scenario: Delivering 13W to dual-band 802.11ac access points mounted on ceilings or walls where AC outlets are unavailable. IC Role / Device Role / Timing Role: Provides regulated 48V PoE sourcing with fast (<310ms) detection and <60ms power-on delay in AUTO mode. Use Value: Enables flexible AP placement; supports Class 0–3 PD identification; maintains MPS compliance for uninterrupted operation. |
| Security Camera Feeding | Industrial Sensor Hub |
|
Use Scenario: Powering fixed-dome IP cameras with IR illumination in retail and warehouse environments. IC Role / Device Role / Timing Role: Supplies stable 13W under varying ambient temperatures (–40°C to +85°C) with DC disconnect protection at 2.6–4.8mV threshold. Use Value: Prevents brownout-induced camera resets; detects cable faults before thermal damage; logs overcurrent events for diagnostics. |
Use Scenario: Centralized power management for distributed industrial sensors (temperature, vibration, humidity) in factory automation systems. IC Role / Device Role / Timing Role: Acts as intelligent PSE node in PROFINET or EtherNet/IP edge gateway, enabling hot-swap sensor replacement. Use Value: Supports maintain-power-signature (MPS) dropout time of 320–380ms; enables per-port shutdown during firmware updates without affecting other sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4266AIUHF-1#TRPBF | Supports LTPoE++ 38.7W per port; adds higher-class detection, extended voltage range (–54.75V min), and enhanced current limit thresholds. | Required for powering LTPoE++-compliant devices like PTZ cameras or thin clients needing >13W; not backward-compatible with 802.3af-only systems requiring strict 13W limits. | Select when future-proofing for higher-power PDs; requires updated external MOSFETs and sense resistors rated for 3A+ continuous current. |
| MAX5984AEUI+T | Quad 802.3af PSE with integrated 0.5Ω sense resistors; lacks LTPoE++ support but offers lower quiescent current (IDD = 0.8mA typ) and smaller 28-pin TQFN package. | Better suited for space-constrained designs where 13W/port suffices and thermal budget is tighter; no 4-point detection - relies on standard 2-point IEEE detection. | Choose for cost-sensitive, compact switches where detection robustness is secondary to footprint and power efficiency. |
Compared with LTC4266CIUHF#TRPBF, the LTC4266AIUHF-1#TRPBF enables scalable power delivery up to 38.7W while retaining identical pinout and software interface, whereas MAX5984AEUI+T trades detection sophistication for smaller size and lower static power - making it suitable for entry-level PoE injectors but less robust in electrically noisy environments.
Availability
LTC4266CIUHF#TRPBF is available at Aetrix Electronics and suitable for VoIP infrastructure, wireless access point deployments, IP security camera systems, and industrial sensor networks requiring stable component supply across long production lifecycles.
Supply support for LTC4266CIUHF#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and power management.
The LTC4266 family was designed specifically for Ethernet-based Power over Ethernet infrastructure, targeting reliable, standards-compliant PSE implementations in enterprise switches, midspans, and industrial gateways where interoperability and field reliability are critical.
FAQ
What is the maximum power per port supported by the LTC4266CIUHF#TRPBF?
The LTC4266CIUHF#TRPBF is rated for up to 13W per port, fully compliant with IEEE 802.3af Type 1 specifications. This rating is achieved using external 0.25Ω sense resistors and N-channel MOSFETs, with active current limiting set at 102–110mV across the sense resistor. It does not support higher power classes such as 802.3at (25.5W) or LTPoE++ (38.7W+), which require different variants like LTC4266AIUHF-1#TRPBF.
Does the LTC4266CIUHF#TRPBF require a microcontroller to operate?
No, the LTC4266CIUHF#TRPBF supports fully autonomous operation via its AUTO pin: tying AUTO to VDD enables automatic PD detection, classification, and power application without any I²C host intervention. However, a microcontroller is required to access advanced features like real-time telemetry, fault logging, or dynamic port reconfiguration - all communicated over the 1MHz I²C interface.
What package type and thermal considerations apply to the LTC4266CIUHF#TRPBF?
The LTC4266CIUHF#TRPBF uses a 38-lead 5mm × 7mm plastic QFN package with an exposed VEE pad (Pin 39). This pad must be soldered to a thermally robust PCB copper area to achieve θJA = 34°C/W. Operating junction temperature must remain ≤125°C; derating is recommended above 85°C ambient, especially under sustained 13W/port load with minimal airflow.
How does the LTC4266CIUHF#TRPBF ensure reliable PD detection in noisy environments?
The LTC4266CIUHF#TRPBF employs a proprietary 4-point detection sequence - two forced-voltage and two forced-current measurements - to validate the 25kΩ ±10% PD signature resistance window. This method rejects false triggers from cable capacitance, ESD events, or floating ports, achieving immunity far exceeding basic 2-point IEEE 802.3af detection. Detection time is guaranteed at 270–310ms across temperature.
Can the LTC4266CIUHF#TRPBF be used in midspan PoE applications?
Yes, the LTC4266CIUHF#TRPBF supports midspan operation via the MID pin: pulling MID high configures the device for midspan mode, enabling use in PoE injectors that add power to data-only Ethernet links. It includes a dedicated midspan backoff timer (2.3–2.7s) to prevent contention in cascaded PSE configurations and complies with IEEE 802.3af timing requirements for midspan devices.
LTC4266CIUHF#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:
- 13 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 45V ~ 57V
- Current - Supply:
- 2.4mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC4266CIUHF#TRPBF FAQ
1.How can I place an order for LTC4266CIUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4266CIUHF#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 LTC4266CIUHF#TRPBF reliable?
The price and inventory of LTC4266CIUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4266CIUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4266CIUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4266CIUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4266CIUHF#TRPBF?
LTC4266CIUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4266CIUHF#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 LTC4266CIUHF#TRPBF?
For technical support, including LTC4266CIUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4266CIUHF#TRPBF requirements.
6.How does Aetrix verify that LTC4266CIUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4266CIUHF#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 LTC4266CIUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4266CIUHF#TRPBF?
All LTC4266CIUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4266CIUHF#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 LTC4266CIUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC4266CIUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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