LTC4274
PRODUCTIONSingle PoE+ PSE Controller
- Part Models
- 4
- 1ku List Price
- Starting From $6.80
Overview
- Compliant with IEEE 802.3at Type 1 and 2
- 0.34Ω Total Channel Resistance
- 130mW/Port at 600mA
- Advanced Power Management
- 8-Bit Programmable Current Limit (ILIM)
- 7-Bit Programmable Overload Currents (ICUT)
- Fast Shutdown
- 14.5-Bit Port Current/Voltage Monitoring
- 2-Event Classification
- Very High Reliability 4-Point PD Detection
- 2-Point Forced Voltage
- 2-Point Forced Current
- High Capacitance Legacy Device Detection
- LTC4259A-1 and LTC4266 SW Compatible
- 1MHz I2C Compatible Serial Control Interface
- Midspan Backoff Timer
- Supports Proprietary Power Levels Above 25W
- Available in 38-Pin 5mm × 7mm QFN Package
The LTC4274 is a single power sourcing equipment controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet systems. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels. External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard. 80V-rated port pins provide robust protection against external faults.
The LTC4274 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify software development; an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation. Midspan operation is supported with built-in 2-event classification and backoff timing. Host communication is via a 1MHz I2C serial interface.
The LTC4274 is available in a 5mm × 7mm QFN package that significantly reduces board space compared with competing solutions.
Applications
- PSE Switches/Routers
- PSE Midspans
Documentation
Data Sheet 1
User Guide 1
Video 2
Product Selector Card 4
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC4274CUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC4274CUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC4274IUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LTC4274IUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Dec 28, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
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| LTC4274CUHF#PBF | PRODUCTION | |
| LTC4274CUHF#TRPBF | PRODUCTION | |
| LTC4274IUHF#PBF | PRODUCTION | |
| LTC4274IUHF#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Evaluation Software 1
Software Interface Datasheet and Software
The software interface datasheet for this PSE may be requested from the Software Request Form (SRF). This datasheet describes the I2C interface and programming details for the respective PSE controller. Reference software for IEEE 802.3at Semi-auto mode operation is available for the LTC4266 (quad) PSE controller and may be applied to the LTC4274 (single); this software is requested from the Software Request Form.
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Interface Transceivers 1 | ||
| LTC4310 | PRODUCTION | Hot-Swappable I2C Isolators |
| Power-over-Ethernet (PoE) Controllers 1 | ||
| LTC4274A/LTC4274C | Single PoE/PoE+/LTPoE++ PSE Controller | |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC4279 | PRODUCTION | Single Port PoE/PoE+/LTPoE++ PSE Controller |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC4274
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
