SY23211A1QEC (SY56805A1QEC)

• Power Up to 13W(input)  PDs
• Supports the IEEE 802.3af Standard
• Primary Side Control
• QR-mode Operation for High Efficiency
• PWM/PFM Control for Higher Average Efficiency 
• Adapter ORing Support
• 100 V, 0.45Ω Hotswap MOSFET
• Integrate 150V, 0.14Ω MOSFET for Converter
• RoHS Compliant and Halogen Free
• Compact Package: QFN5*5-32L

The SY23211A1 is a combined Power over Ethernet (PoE) powered device (PD) interface and primary side converter optimized specifically for isolated converter designs. The PoE interface supports the IEEE 802.3af standard as a 13W Type 1 powered device.

To achieve higher efficiency and better EMI performance, SY23211A1 drives Flyback converters in the Quasi-Resonant mode and adaptive PWM/PFM control. The flyback converter integrate a 150V, 0.14Ω MOSFET.

SY23211A1 features a detection signature pin which can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off during powered operation. Classification can be programmed to any of the defined Type 1 PD with a single resistor.