• IEEE 802.3af/at/bt Powered Device (PD) Solution for Type 1-4 PoE Applications
• Supports Up to 71.3W PDs
• Supports up to 5-Event Classification Sensing
• 100V Robust Surge Protection (Abs. Max.)
• Wide Junction Temperature Range (–40℃ to 125℃)
• Integrated Signature Resistor
• Thermal Shutdown Protection
• External Hot-swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
• Configurable Aux Power Support as Low as 9V
• RoHS Compliant and Halogen Free
• Available in 10-Lead MSOP Package

The SY28902 is a power device (PD) controller with all the features needed to implement the IEEE802.3at/at/bt protocol. It integrates a multi-state /T2P output indicator to indicate the number of classification events received during IEEE 802.3bt-compliant identification and negotiation of available power.

An internal charge-pump is used for enabling the use of external low RDS(ON) N-channel MOSFETs and increase the end-to-end power transmission efficiency. The SY28902 includes an integrated signature resistor, under-voltage lockout, a power-good output and thermal protection. The start-up inrush current can be adjusted using an external capacitor. Auxiliary power override is supported for voltages higher than 9V applied to the AUX pin.

802.3bt, 802.3at, and 802.3af power levels are all supported by configuring external components