Overview
Features and Benefits
- 12 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 52-Lead 7mm × 8mm (LTC4270) and 24‑Lead 4mm × 4mm (LTC4271) QFN Packages
Product Details
The LTC4270/LTC4271 chipset is a 12-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 LTC4270/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 LTC4270/LTC4271 includes an I2C serial interface operable up to 1MHz.
The LTC4270/LTC4271 is available in multiple power grades allowing delivered PD power up to 90W.
APPLICATIONS
- PoE PSE Switches/Routers
- PoE PSE Midspans
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
-
R547 Reliability Data3/26/2018PDF146 K
-
R558 Reliability Data3/23/2018PDF30 K
-
DC1840C - Demo Manual (Rev. E)6/1/2016PDF2M
-
Power over Ethernet Solutions4/4/2017PDF1 M
-
PoE PD Controllers6/22/2015PDF552K
-
LTPoE++ PSE Controllers6/10/2013PDF886K
-
Isolated 12-Port PoE10/24/2011PDF688K
-
PoE++ Video Product Brief10/15/2018
-
LTPoE++ Extends PoE to 90W with Reliable and Easy-to-Use Standard11/1/2011 LT Journal
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC4270AIUKG#PBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| LTC4270AIUKG#TRPBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| LTC4270BIUKG#PBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| LTC4270BIUKG#TRPBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| LTC4270CIUKG#PBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| LTC4270CIUKG#TRPBF | Material Declaration | Reliability Data | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R558 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.