LTC4290
PRODUCTION8-Port PoE/PoE+/LTPoE++ PSE Analog Controller
- Part Models
- 6
- 1ku List Price
- Starting From $10.52
Overview
- Eight Independent PSE Channels
- Compliant with IEEE 802.3at Type 1 and 2
- Chipset Provides Electrical Isolation
- Reduced BOM Cost
- Eliminates up to 6 High Speed Opto-Couplers
- Eliminates Isolated 3.3V Power Supply
- Low Power Dissipation
- 0.25Ω Sense Resistance Per Channel
- Very High Reliability 4-Point PD Detection
- 2-Point Forced Voltage
- 2-Point Forced Current
- VEE and VPORT Monitoring
- 1 Second Rolling IPORT Averaging
- Supports 2-Pair and 4-Pair Output Power
- 1MHz I2C Compatible Serial Control Interface
- Available In Three Power Grades
- A-Grade – LTPoE++™ 38.7W to 90W
- B-Grade – PoE+ 25.5W
- C-Grade – PoE 13W
- Available In a 40-Lead 6mm × 6mm (LTC4290) and 24-Lead 4mm × 4mm (LTC4271) QFN Package
The LTC4290/LTC4271 chipset is an 8-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1 and Type 2 (high power) compliant Power over Ethernet (PoE) systems. Transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply resulting in significant BOM cost savings. The LTC4290/LTC4271 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.25Ω sense resistors.
Advanced power management features include per-port 12-bit current monitoring ADCs, DAC-programmable current limit, and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a 2 second backoff timer. The LTC4290/LTC4271 includes an I2C serial interface operable up to 1MHz.
The LTC4290/LTC4271 is available in multiple power grades allowing delivered PD power up to 90W.
Applications
- PoE PSE Switches/Routers
- PoE PSE Midspans
There is a newer version of this part available
12/24-Port IEEE 802.3bt 4-pair PoE PSE Digital Controller
Documentation
Data Sheet 1
User Guide 2
Technical Articles 2
Video 2
Product Selector Card 3
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 |
|---|---|---|---|
| LTC4290AIUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC4290AIUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC4290BIUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC4290BIUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC4290CIUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC4290CIUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm 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) |
||
| LTC4290AIUJ#PBF | PRODUCTION | |
| LTC4290AIUJ#TRPBF | PRODUCTION | |
| LTC4290BIUJ#PBF | PRODUCTION | |
| LTC4290BIUJ#TRPBF | PRODUCTION | |
| LTC4290CIUJ#PBF | PRODUCTION | |
| LTC4290CIUJ#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Interface Transceivers 1 | ||
| LTM2883 | PRODUCTION | SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power |
| Power-over-Ethernet (PoE) Controllers 2 | ||
| LT4275 | PRODUCTION | LTPoE++/PoE+/PoE PD Controller |
| LTC4270 | PRODUCTION | 12-Port PoE/PoE+/LTPoE++ PSE Analog Controller |
| Temperature Sensors 1 | ||
| LTC2990 | RECOMMENDED FOR NEW DESIGNS | Quad I2C Voltage, Current and Temperature Monitor |
