LTC4278IDKD#PBF

LTC4278 is an integrated powered device (PD) controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. With a wide input voltage range, it is specifically designed to support PD applications that include a low-voltage auxiliary power input such as a 12V wall adaptor. The inclusion of a shutdown pin provides simple implementation of both PoE and auxiliary dominate applications. In addition, it supports both 1-event and 2-event classifications as defined by the IEEE, thereby allowing the use in a wide range of product configurations. This devices 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. It is used in applications such as VoIP phones with advanced display options, dual-radio wireless access points, PTZ security cameras, RFID readers, industrial controls etc.

• Shutdown pin for flexible auxiliary power support
• Superior EMI performance
• 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
• Operating temperature range from -40°C to 85°C
• Package style is 32-lead plastic DFN

Note

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party