LT4275
PRODUCTIONLTPoE++/PoE+/PoE PD Controller
- Part Models
- 24
- 1ku List Price
- Starting From $1.42
Overview
- IEEE 802.3af/at and LTPoE++™ Powered Device (PD) Controller
- LTPoE++ Supports Power Levels Up to 90W
- LT4275A Supports All of the Following Standards:
- LTPoE++ 38.7W, 52.7W, 70W and 90W
- IEEE 802.3at 25.5W Compliant
- IEEE 802.3af Up to 13W Compliant
- LT4275B is IEEE 802.3at/af Compliant
- LT4275C is IEEE 802.3af Compliant
- 100V Absolute Maximum Input Voltage
- Wide Junction Temperature Range (–40°C to 125°C)
- Overtemperature Protection
- Integrated Signature Resistor
- External Hot Swap™ N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
- Programmable Aux Power Support as Low as 9V
- Optional Support of Non-Standard Low Voltage PoE
- Available in 10-Lead MSOP and 3mm × 3mm DFN Packages
The LT4275 is a pin-for-pin compatible family of IEEE 802.3 and LTPoE++ powered device (PD) controllers.
The LT4275A employs a proprietary LTPoE++ classification scheme, delivering 38.7W, 52.7W, 70W or 90W of power at the PD RJ45 connector. The LT4275A is fully compatible with IEEE 802.3. The LT4275B is an IEEE 802.3at compliant, Type 2 (PoE+) PD delivering up to 25.5W. The LT4275C is an IEEE 802.3af compliant, Type 1 (PoE) PD delivering up to 13W.
The LT4275 internal charge pump provides an N-channel MOSFET solution, eliminating a larger and more costly P-channel MOSFET. A low RDS(ON) MOSFET also maximizes power delivery and efficiency, reduces power and heat dissipation, and eases thermal design. Startup inrush current is adjustable with an external capacitor. The LT4275 also includes a power good output, on-board signature resistor, undervoltage lockout, and thermal protection. The LT4275A/LT4275B drives a single opto-coupler to indicate the power level of the attached PSE. Pin-selectable support for non-standard low voltage operation is provided. Auxiliary power override is supported with the AUX pin.
The LT4275A can be configured to support all possible LTPoE++, 802.3at and 802.3af power levels with external component changes.
Applications
- High Power Wireless Data Systems
- Outdoor Security Camera Equipment
- Commercial and Public Information Displays
- High Temperature Industrial Applications
Documentation
Data Sheet 1
User Guide 2
Design Note 1
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 |
|---|---|---|---|
| LT4275AHDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275AHDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275AHMS#PBF | 10-Lead MSOP | ||
| LT4275AHMS#TRPBF | 10-Lead MSOP | ||
| LT4275AIDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275AIDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275AIMS#PBF | 10-Lead MSOP | ||
| LT4275AIMS#TRPBF | 10-Lead MSOP | ||
| LT4275BHDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275BHDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275BHMS#PBF | 10-Lead MSOP | ||
| LT4275BHMS#TRPBF | 10-Lead MSOP | ||
| LT4275BIDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275BIDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275BIMS#PBF | 10-Lead MSOP | ||
| LT4275BIMS#TRPBF | 10-Lead MSOP | ||
| LT4275CHDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275CHDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275CHMS#PBF | 10-Lead MSOP | ||
| LT4275CHMS#TRPBF | 10-Lead MSOP | ||
| LT4275CIDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275CIDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4275CIMS#PBF | 10-Lead MSOP | ||
| LT4275CIMS#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LT4275AHDD#PBF | PRODUCTION | |
| LT4275AHDD#TRPBF | PRODUCTION | |
| LT4275AIDD#PBF | PRODUCTION | |
| LT4275AIDD#TRPBF | PRODUCTION | |
| LT4275BHDD#PBF | PRODUCTION | |
| LT4275BHDD#TRPBF | PRODUCTION | |
| LT4275BIDD#PBF | PRODUCTION | |
| LT4275BIDD#TRPBF | PRODUCTION | |
| LT4275CHDD#PBF | PRODUCTION | |
| LT4275CHDD#TRPBF | PRODUCTION | |
| LT4275CIDD#PBF | PRODUCTION | |
| LT4275CIDD#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT4275AHMS#PBF | PRODUCTION | |
| LT4275AHMS#TRPBF | PRODUCTION | |
| LT4275AIMS#PBF | PRODUCTION | |
| LT4275AIMS#TRPBF | PRODUCTION | |
| LT4275BHMS#PBF | PRODUCTION | |
| LT4275BHMS#TRPBF | PRODUCTION | |
| LT4275BIMS#PBF | PRODUCTION | |
| LT4275BIMS#TRPBF | PRODUCTION | |
| LT4275CHMS#PBF | PRODUCTION | |
| LT4275CHMS#TRPBF | PRODUCTION | |
| LT4275CIMS#PBF | PRODUCTION | |
| LT4275CIMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT4275AHMS#PBF | PRODUCTION | |
| LT4275AHMS#TRPBF | PRODUCTION | |
| LT4275AIMS#PBF | PRODUCTION | |
| LT4275AIMS#TRPBF | PRODUCTION | |
| LT4275BHMS#PBF | PRODUCTION | |
| LT4275BHMS#TRPBF | PRODUCTION | |
| LT4275BIMS#PBF | PRODUCTION | |
| LT4275BIMS#TRPBF | PRODUCTION | |
| LT4275CHMS#PBF | PRODUCTION | |
| LT4275CHMS#TRPBF | PRODUCTION | |
| LT4275CIMS#PBF | PRODUCTION | |
| LT4275CIMS#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 |
|---|---|---|
| Circuit Monitors 1 | ||
| LT2940 | PRODUCTION | Power and Current Monitor |
| Ideal Diodes and PowerPath Controllers 1 | ||
|
LT4320 LT4320-1 |
Ideal Diode Bridge Controller | |
| Power-over-Ethernet (PoE) Controllers 4 | ||
| LTC4270 | PRODUCTION | 12-Port PoE/PoE+/LTPoE++ PSE Analog Controller |
| LTC4266A/LTC4266C | Quad PoE/PoE+/LTPoE++ PSE Controller | |
| LT4321 | RECOMMENDED FOR NEW DESIGNS | PoE Ideal Diode Bridge Controller |
| LT4276 | PRODUCTION | LTPoE++/PoE+/PoE PD Forward/Flyback Controller |
| Temperature Sensors 1 | ||
| LTC2997 | PRODUCTION | Remote/Internal Temperature Sensor |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT4275A
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.
Evaluation Kits
LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board
Resources
LT4275B/LT4321 PoE+/PoE PD Demo Board
Resources
LT4275C/LT4321 PoE PD Demo Board
Resources
LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller
Resources
PoE+ with Ideal Diode Bridge to Isolated Flyback DC/DC (12V, 2A)