LTC4269-2

NOT RECOMMENDED FOR NEW DESIGNS

IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support

Part Models: 4
1ku List Price: Starting From $2.71

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Overview

25.5W IEEE 802.3at Compliant (Type-2) PD
PoE⁺ 2-Event Classification
IEEE 802.3at High Power Available Indicator
Integrated State-of-the-Art Synchronous Forward Controller
Flexible Auxiliary Power Interface
Superior EMI Performance
Robust 100V 0.7Ω (Typ) Integrated Hot Swap^™ MOSFET
Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection
Short-Circuit Protection with Auto-Restart
Programmable Switching Frequency from 100kHz to 500kHz
Thermally Enhanced 7mm × 4mm DFN Package

The LTC4269-2 is an integrated Powered Device (PD) interface and power supply controller featuring 2-event classification signaling, flexible auxiliary power options, and a power supply controller suitable for synchronously rectified forward supplies. These features make the LTC4269-2 ideally suited for an IEEE802.3at PD application.

The PD controller features a 100V MOSFET that isolates the power supply during detection and classification, and provides 100mA inrush current limit. Also included are power good outputs, an undervoltage/overvoltage lockout and thermal protection. The current mode forward controller allows for synchronous rectification, resulting in an extremely high efficiency, green product. Soft-start for controlled output voltage start-up and fault recovery is included. Programmable frequency over 100kHz to 500kHz allows flexibility in efficiency vs size and low EMI.

Applications

IP Phones with Large Color Screens
Dual Radio 802.11n Access Points
PTZ Security Cameras

Part Models: 4
1ku List Price: Starting From $2.71

Documentation

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
LTC4269CDKD-2#PBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4269CDKD-2#TRPBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4269IDKD-2#PBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4269IDKD-2#TRPBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Circuit Monitors 1
LT2940	PRODUCTION	Power and Current Monitor
Power-over-Ethernet (PoE) Controllers 1
LT4275	PRODUCTION	LTPoE++/PoE+/PoE PD Controller

Tools & Simulations

LTspice 1

LTC4269-2 - Power-over-Ethernet (PoE) Interface Controllers

Models for the following parts are available in LTspice:

LTC4269-1
LTC4269-2

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.