LT4275
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT4275

LTPoE++/PoE+/PoE PD Controller

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 24
1ku List Price Starting From $1.12
Features
  • 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
Additional Details
show more Icon

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
Part Models 24
1ku List Price Starting From $1.12

close icon
Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT4275AHDD#PBF
  • HTML
  • HTML
LT4275AHDD#TRPBF
  • HTML
  • HTML
LT4275AHMS#PBF
  • HTML
  • HTML
LT4275AHMS#TRPBF
  • HTML
  • HTML
LT4275AIDD#PBF
  • HTML
  • HTML
LT4275AIDD#TRPBF
  • HTML
  • HTML
LT4275AIMS#PBF
  • HTML
  • HTML
LT4275AIMS#TRPBF
  • HTML
  • HTML
LT4275BHDD#PBF
  • HTML
  • HTML
LT4275BHDD#TRPBF
  • HTML
  • HTML
LT4275BHMS#PBF
  • HTML
  • HTML
LT4275BHMS#TRPBF
  • HTML
  • HTML
LT4275BIDD#PBF
  • HTML
  • HTML
LT4275BIDD#TRPBF
  • HTML
  • HTML
LT4275BIMS#PBF
  • HTML
  • HTML
LT4275BIMS#TRPBF
  • HTML
  • HTML
LT4275CHDD#PBF
  • HTML
  • HTML
LT4275CHDD#TRPBF
  • HTML
  • HTML
LT4275CHMS#PBF
  • HTML
  • HTML
LT4275CHMS#TRPBF
  • HTML
  • HTML
LT4275CIDD#PBF
  • HTML
  • HTML
LT4275CIDD#TRPBF
  • HTML
  • HTML
LT4275CIMS#PBF
  • HTML
  • HTML
LT4275CIMS#TRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

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

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0130

arrow down

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

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 4

reference details image

DC2093A-A

LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board

reference details image

DC2093A-B

LT4275B/LT4321 PoE+/PoE PD Demo Board

reference details image

DC2093A-C

LT4275C/LT4321 PoE PD Demo Board

reference details image

DC2125A

LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

zoom

DC2125A

LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

Product Detail

Demonstration circuit 2125 is a small, highly-integrated, non-isolated PoE Powered Device (PD) solution. It features a PD Interface Controller (LT4275), which interfaces with a PoE Power Sourcing Equipment (PSE), an ideal diode bridge controller (LT4321), which minimizes bridge losses, and a DC/DC μModule® regulator (LTM8027).

Tools & Simulations

Tools & Simulations 1

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.

Recently Viewed