LTC4265 - IEEE 802.3 at High Power PD Interface Controller with 2-Event Classification Recognition
Features
- IEEE 802.3af/at Powered Device (PD) Controller
- IEEE 802.3at 2-event Classification Signaling
- Programmable Classification Current
- Flexible Auxiliary Power Support Using SHDN Pin
- Rugged 100V Onboard MOSFET with 100mA Inrush Current Limit.
- Complementary Power Good Outputs
- Onboard Signature Resistor
- Comprehensive Thermal Protection
- Undervoltage and Overvoltage Lockout
- 12-Lead, 4mm × 3mm DFN Package
Typical Application
Description
The LTC®4265 is a 3rd generation Powered Device (PD) Interface controller intended for IEEE 802.3at high power Power-over-Ethernet (PoE) applications up to 25.5W. By supporting 1-event and 2-event classification signaling as defined by IEEE 802.3, the LTC4265 can be used in a wide range of product configurations. A 100V MOSFET isolates the DC/DC converter during detection and classification, and provides 100mA inrush current for a smooth power-up transition. The LTC4265 also includes complementary power good outputs, an on-board signature resistor, undervoltage/overvoltage lockout and comprehensive thermal protection. All Linear Technology PD solutions include a shutdown pin with signature corrupt to provide flexible auxiliary power options.
The LTC4265 PD interface controller can be used along with a variety of DC/DC converter products to provide a complete, cost effective power solution for high power PD applications.
The LTC4265 is available in the space-saving low profile (4mm × 3mm) DFN package and is drop-in compatible with the LTC4264.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4265CDE#PBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LTC4265CDE#TRPBF | 4x3 DFN-12 | DE/UE | C | 05-08-1695 | Yes |
| LTC4265IDE#PBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LTC4265IDE#TRPBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4265CDE#PBF | 4x3 DFN-12 | C | $2.57 | $1.80 | Yes | |
| LTC4265CDE#TRPBF | 4x3 DFN-12 | C | $1.86 | Yes | ||
| LTC4265IDE#PBF | 4x3 DFN-12 | I | $3.07 | $2.15 | Yes | |
| LTC4265IDE#TRPBF | 4x3 DFN-12 | I | $2.21 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1415A | LTC4265 IEEE802.3at PD Controller | $75.00 | |
| Buy Now | |||
Applications
- 802.11n Access Points
- High Power VoIP Video Phones
- RFID Reader Systems
- PTZ Security Cameras and Surveillance Equipment
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC4265
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
