LTC4269-2 Datasheet | Linear Technology

Features n 25.5W IEEE 802.3at pliant (Type-2) PD n Po E+ 2-Event Classification n IEEE 802.3at High Power Available Indicator n Integrated State-of-the-Art Synchronous Forward Controller - Isolated Power Supply Efficiency >94% n Flexible Auxiliary Power Interface n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET n Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Switching Frequency from 100k Hz to 500k Hz n Thermally Enhanced 7mm × 4mm DFN Package Applications n IP Phones with Large Color Screens n Dual Radio 802.11n Access Points n PTZ Security Cameras IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support Description The LTC®4269-2 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 100m A 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 100k Hz to 500k Hz allows flexibility in efficiency vs size and low EMI. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap, Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Po E-Based Self-Driven Synchronous Forward Power Supply 1m H -...