• 简体中文
• English

LTC4269-1 - IEEE 802.3at High Power PD and No-Opto Flyback Controller with AUX Support

The LTC4269-1 is an integrated Powered Device (PD) controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. The LTC4269-1 is targeted for high efficiency, single and multioutput applications from 10W to 25W. By supporting both 1-event and 2-event classifications, as defined by the IEEE, the LTC4269-1 can be used in a wide range of product configurations.

The LTC4269-1 synchronous, current mode, flyback controller generates multiple supply rails in a single conversion step providing for the highest system efficiency while maintaining tight regulation across all outputs. The LTC4269-1 includes Linear Technology’s patented No-Opto feedback topology to provide full IEEE 802.3 isolation without the need of an opto-isolator circuit. A true soft-start function allows graceful ramp-up of all output voltages.

All Linear Technology PD solutions include a shutdown pin to provide flexible auxiliary power options. The LTC4269-1 can accommodate adaptor voltages from 18V to 60V and supports both PoE or aux dominance options. The LTC4269-1 is available in a space saving 32-pin DFN package.

Features 25.5W IEEE 802.3at Compliant (Type 2) PD Integrated State-of-the-Art Synchronous Flyback Controller – Isolated Power Supply Efficiency >92% – 88% Efficiency Including Diode Bridge and Hot Swap™ FET Flexible Integrated Auxiliary Power Support Superior EMI Performance Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET IEEE 802.3at High Power Available Indicator Integrated Signature Resistor and Programmable Class Current Undervoltage, Overvoltage and Thermal Protection Short-Circuit Protection with Auto-Restart Programmable Soft-Start and Switching Frequency Complementary Power Good Indicators Thermally Enhanced 7mm × 4mm DFN Package Typical Application

Applications VoIP Phones with Advanced Display Options Dual-Radio Wireless Access Points PTZ Security Cameras RFID Readers Industrial Controls Packaging

Order Information

Demo Boards