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Analog Devices Inc. LT4294HDD#TRPBF
- Part No.:
- LT4294HDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT4294HDD#TRPBF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,313
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Product details
Overview
LT4294HDD#TRPBF from Analog Devices is an IEEE 802.3bt-compliant single-signature powered device (PD) interface controller in a 10-lead 3mm × 3mm DFN package, operating from –40°C to 125°C. It supports up to 71.3W PD power delivery, features 5-event classification sensing, integrated signature resistor (24.4kΩ), and controls an external N-channel hot-swap MOSFET for high-efficiency PoE power conversion in outdoor security cameras and commercial displays.
For engineers reviewing the LT4294HDD#TRPBF datasheet, LT4294HDD#TRPBF pinout, LT4294HDD#TRPBF application, or LT4294HDD#TRPBF equivalent, key selection criteria include IEEE 802.3bt Class 8 support (71.3W), T2P-encoded PSE power allocation feedback, auxiliary supply override down to 9V, thermal protection up to 125°C junction, and compatibility with LT4320/LT4321 ideal diode bridges.
Technical Context
The LT4294HDD#TRPBF implements IEEE 802.3bt single-signature PD detection, classification, and power handshaking using dual classification resistors (RCLASS/RCLASS++) to configure Classes 0–8. Its T2P output encodes PSE-allocated power via duty-cycle-modulated open-drain signaling (25%/50%/Hi-Z/Low-Z states), directly reflecting number of classification events (1–5) and auxiliary mode status.
It integrates a charge pump to drive an external N-channel MOSFET gate (HSGATE), enabling low RDS(ON) hot-swap control with VHSON = 35–37V and VHSOFF = 30–31V hysteresis. The device includes on-chip signature resistor (23.7–25.2kΩ), undervoltage lockout, overtemperature protection, and PWRGD power-good indicator with 0.8V low-level threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPORT Input Range | 60V max operating voltage; withstands 100V absolute maximum for surge immunity |
| Power Delivery | Supports IEEE 802.3bt Class 8 (71.3W) with 5-event classification |
| Detection Signature | 24.4kΩ ±0.7kΩ precision resistor enables reliable PSE detection per IEEE 802.3 |
| T2P Encoding | Open-drain output with 25% (Class 7/8), 50% (Class 5/6), Hi-Z (Class 0–4), or Low-Z (PoE active) duty cycle |
| Junction Temp Range | –40°C to 125°C operation; overtemperature protection triggers above TJMAX = 150°C |
| AUX Threshold | 6.3V nominal VAUXT with 3.2–7µA hysteresis current enables auxiliary supply takeover at ≥9V |
| Hot Swap Control | HSGATE drives external N-MOSFET with VGOC = 10–18V open-circuit voltage and 200µA pull-down |
Pinout & Package
LT4294HDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11) soldered to PCB GND for thermal and electrical integrity. Pin pitch is 0.5mm; package thickness is 0.8mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 5, Exposed Pad 11) | Ground reference and thermal path | Must be connected to PCB GND; exposed pad is electrically tied to Pin 5 and mandatory for thermal performance |
| AUX (Pin 2) | Auxiliary supply sense input | Sets 6.3V threshold for auxiliary mode entry; sinks 3.2–7µA hysteresis current when below VAUXT |
| RCLASS (Pin 3) | Primary classification resistor terminal | Connects to GND via 1% resistor (e.g., 49.9Ω for Class 8); sets classification current per Table 2 |
| RCLASS++ (Pin 4) | Secondary classification resistor terminal | Connects to GND via second 1% resistor (e.g., 118Ω for Class 8); enables 5-event Class 5–8 detection |
| T2P (Pin 6) | PSE type/power allocation indicator | Open-drain output encoding PSE-allocated power level via duty cycle (25%/50%/Hi-Z/Low-Z) |
| PWRGD (Pin 7) | Power good status signal | Open-drain output pulled low until HSGATE reaches ~7V above HSSRC; holds off downstream circuitry |
| HSSRC (Pin 8) | External MOSFET source connection | Connects to source of external N-channel MOSFET; forms return path for hot-swap current |
| HSGATE (Pin 9) | External MOSFET gate driver | Charge-pump-driven output controlling MOSFET turn-on; provides 10–18V gate drive with 200µA pull-down |
| VPORT (Pin 10) | PoE input rail and MOSFET drain node | Accepts 60V PoE input; connects to drain of external N-MOSFET and upstream bridge rectifier |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3bt Class 8 Support | Enables 71.3W PD operation with full backward compatibility to 802.3af/at PSEs via 5-event classification |
| Integrated Signature Resistor | 24.4kΩ ±0.7kΩ precision resistor eliminates external component while meeting IEEE 802.3 detection requirements |
| T2P Power Allocation Encoding | Duty-cycle-modulated open-drain output conveys exact PSE-allocated power level without additional communication bus |
| Auxiliary Supply Override | Enables seamless switchover to 9–60V auxiliary input with automatic signature disconnect and PWRGD release |
| N-Channel Hot-Swap Control | Charge-pump gate driver reduces MOSFET conduction loss vs. P-channel solutions, improving system efficiency by >3% |
| Robust Surge Protection | 100V absolute maximum VPORT rating with integrated thermal shutdown protects against Ethernet cable surges |
Applications
| Outdoor Security Cameras | Commercial Information Displays |
|---|---|
Use Scenario: High-resolution IP cameras deployed outdoors require 40–71.3W PoE+ power for pan-tilt-zoom, IR illumination, and video analytics processing. IC Role / Device Role / Timing Role: LT4294HDD#TRPBF acts as the primary PD interface controller, managing IEEE 802.3bt classification, hot-swap sequencing, and T2P-based power negotiation with the PSE. Use Value: Enables full Class 8 (71.3W) operation with 5-event classification, supporting dual-band Wi-Fi, AI inference, and thermal imaging without auxiliary power. | Use Scenario: Large-format digital signage in retail environments demands stable 25.5–51W PoE power for LED backlighting, touch controllers, and media playback. IC Role / Device Role / Timing Role: LT4294HDD#TRPBF serves as the IEEE 802.3bt-compliant PD controller, coordinating with LT4321 ideal diode bridge to minimize forward voltage drop and heat dissipation. Use Value: Achieves >94% end-to-end power efficiency versus silicon diode bridges, eliminating heatsinks and enabling ultra-thin display enclosures. |
| Industrial IoT Gateways | High-Temperature Wireless APs |
Use Scenario: Factory-floor edge gateways operate in ambient temperatures up to 85°C and require 30–40W PoE for cellular modems, sensor aggregation, and real-time protocol translation. IC Role / Device Role / Timing Role: LT4294HDD#TRPBF provides robust PD control with –40°C to 125°C extended temperature grade and overtemperature protection. Use Value: Maintains reliable operation under sustained 1.5W classification dissipation, preventing thermal shutdown during prolonged PSE handshake sequences. | Use Scenario: Outdoor wireless access points mounted on cell towers require 51–71.3W PoE power and must survive junction temperatures exceeding 105°C in direct sunlight. IC Role / Device Role / Timing Role: LT4294HDD#TRPBF functions as the IEEE 802.3bt PD controller with integrated thermal protection and 125°C rated DFN package. Use Value: Delivers guaranteed Class 6/7 operation at full junction temperature, avoiding derating or forced-air cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device interface controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4294IMS#TRPBF | Same functionality and pinout; MSOP-10 package with –40°C to 85°C temp range vs. DFN's –40°C to 125°C | Preferred for cost-sensitive indoor applications where extended temperature is unnecessary | Select LT4294IMS#TRPBF when ambient temperature stays below 85°C and MSOP footprint is acceptable |
| LT4275AHMS#TRPBF | Pin-compatible LTPoE++ PD controller supporting up to 90W; lacks IEEE 802.3bt T2P encoding and 5-event classification logic | Used in legacy LTPoE++ infrastructure; not interoperable with IEEE 802.3bt PSEs requiring mutual identification | Choose LT4275AHMS#TRPBF only for LTPoE++-only deployments; LT4294HDD#TRPBF is required for IEEE 802.3bt compliance |
Compared with LT4294IMS#TRPBF, the LT4294HDD#TRPBF offers 40°C higher maximum junction temperature and smaller DFN footprint, critical for thermally constrained outdoor designs; versus LT4275AHMS#TRPBF, it provides native IEEE 802.3bt compliance and T2P-based power negotiation, enabling interoperability with modern PoE switches.
Availability
LT4294HDD#TRPBF is available at Aetrix Electronics and suitable for outdoor security camera equipment, commercial information displays, and high-temperature industrial IoT gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4294HDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets with precision power, signal chain, and RF solutions.
The LT4294 product line delivers IEEE 802.3bt-compliant powered device interface controllers optimized for high-power PoE applications demanding extended temperature operation, minimal external components, and seamless migration from legacy PoE standards.
FAQ
What is the maximum power level supported by the LT4294HDD#TRPBF?
The LT4294HDD#TRPBF supports IEEE 802.3bt Class 8 operation with up to 71.3W of delivered power to the PD load. This requires 5-event classification and proper configuration of both RCLASS and RCLASS++ resistors per Table 2 in the datasheet. The LT4294HDD#TRPBF achieves this while maintaining backward compatibility with 802.3af and 802.3at PSEs.
How does the T2P pin on the LT4294HDD#TRPBF communicate power allocation?
The T2P pin on the LT4294HDD#TRPBF uses duty-cycle modulation to encode PSE-allocated power: 25% low-Z indicates Class 7 or 8 (62W or 71.3W), 50% low-Z indicates Class 5 or 6 (40W or 51W), Hi-Z indicates Class 0–4 (≤25.5W), and continuous low-Z indicates PoE active state. This encoding is determined by AUX status and number of classification events received.
Can the LT4294HDD#TRPBF operate with auxiliary power below 10V?
Yes, the LT4294HDD#TRPBF supports auxiliary supply override as low as 9V via the AUX pin. However, for auxiliary inputs below 10V, an LT4320-based ideal diode bridge is required to recover diode voltage drop and ensure VPORT remains within the 8–60V AUX mode range specified in the Electrical Characteristics table.
What is the purpose of the RCLASS++ pin on the LT4294HDD#TRPBF?
The RCLASS++ pin on the LT4294HDD#TRPBF enables 5-event classification for IEEE 802.3bt Classes 5–8. When configured with a specific resistor to GND (e.g., 118Ω for Class 8), it signals the PSE to perform additional classification events, allowing the LT4294HDD#TRPBF to request and negotiate higher power levels beyond Class 4 (25.5W).
Does the LT4294HDD#TRPBF require an external MOSFET, and what are its gate drive specifications?
Yes, the LT4294HDD#TRPBF requires an external N-channel MOSFET controlled via the HSGATE pin. It provides a charge-pump-generated gate drive with 10–18V open-circuit voltage (VGOC), 200µA pull-down capability, and supports MOSFETs with low RDS(ON) to maximize efficiency. The HSSRC pin connects to the MOSFET source terminal.
LT4294HDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 71 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE), 802.3bt
- Voltage - Supply:
- 60V (Max)
- Current - Supply:
- 2mA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT4294HDD#TRPBF FAQ
1.How can I place an order for LT4294HDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4294HDD#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 LT4294HDD#TRPBF reliable?
The price and inventory of LT4294HDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4294HDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4294HDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4294HDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4294HDD#TRPBF?
LT4294HDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4294HDD#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 LT4294HDD#TRPBF?
For technical support, including LT4294HDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4294HDD#TRPBF requirements.
6.How does Aetrix verify that LT4294HDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4294HDD#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 LT4294HDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4294HDD#TRPBF?
All LT4294HDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4294HDD#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 LT4294HDD#TRPBF part is unused and in its original packaging.
Return procedure for LT4294HDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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