Linear Technology LTC4269CDKD-1#PBF

Description
The LTC4269-1 is an integrated Powered Device (PD) controller and switching regulator designed for high-power IEEE 802.3at and 802.3af applications. It supports both 1-event and 2-event classifications, enabling use in various product configurations.
The LTC4269-1 features a synchronous, current mode, flyback controller that generates multiple supply rails in a single conversion step, maximizing system efficiency and maintaining tight regulation across all outputs. It employs Linear Technology's No-Opto feedback topology for full IEEE 802.3 isolation without an opto-isolator circuit. A true soft-start function allows for graceful ramp-up of output voltages.
The LTC4269-1 includes a shutdown pin for flexible auxiliary power options and supports adaptor voltages from 18V to 60V, accommodating both PoE and auxiliary dominance options. It is available in a space-saving 32-pin DFN package.

Features
IEEE 802.3at Compliant (Type 2) PD
Integrated 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 0.72 (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 x 4mm DFN Package

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