LTC4270
PRODUCTION12-Port PoE/PoE+/LTPoE++ PSE Analog Controller
- Part Models
- 6
- 1ku List Price
- Starting From $13.50
Overview
- 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
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
There is a newer version of this part available
48-Port IEEE 802.3bt PoE PSE Digital Controller
There is a newer version of this part available
12/24-Port IEEE 802.3bt 4-pair PoE PSE Digital Controller
There is a newer version of this part available
12-Channel IEEE 802.3at/bt PoE PSE Analog Controller
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
Video 1
Product Selector Card 3
Product Selection Guide 1
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 |
|---|---|---|---|
| LTC4270AIUKG#PBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC4270AIUKG#TRPBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC4270BIUKG#PBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC4270BIUKG#TRPBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC4270CIUKG#PBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC4270CIUKG#TRPBF | 52-Lead QFN (7mm x 8mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 29, 2022 - 22_0212 LTC4270 Datasheet Limit Change |
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| LTC4270AIUKG#PBF | PRODUCTION | |
| LTC4270AIUKG#TRPBF | PRODUCTION | |
| LTC4270BIUKG#PBF | PRODUCTION | |
| LTC4270BIUKG#TRPBF | PRODUCTION | |
| LTC4270CIUKG#PBF | PRODUCTION | |
| LTC4270CIUKG#TRPBF | PRODUCTION | |
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Aug 24, 2021 - 21_0168 LTC4270 Bond Wire Diameter Change from 1.3mil to 0.8mil |
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| LTC4270AIUKG#PBF | PRODUCTION | |
| LTC4270AIUKG#TRPBF | PRODUCTION | |
| LTC4270BIUKG#PBF | PRODUCTION | |
| LTC4270BIUKG#TRPBF | PRODUCTION | |
| LTC4270CIUKG#PBF | PRODUCTION | |
| LTC4270CIUKG#TRPBF | PRODUCTION | |
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Jul 31, 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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| LTC4270AIUKG#PBF | PRODUCTION | |
| LTC4270AIUKG#TRPBF | PRODUCTION | |
| LTC4270BIUKG#PBF | PRODUCTION | |
| LTC4270BIUKG#TRPBF | PRODUCTION | |
| LTC4270CIUKG#PBF | PRODUCTION | |
| LTC4270CIUKG#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
