• IEEE 802.3at Classification With Status Flag

• High Efficiency Solutions Over Wide Load Range

• Powers Up to 25.5 W PDs

• Robust 100 V, 0.5 Ω Hotswap MOSFET

• Synchronous Rectifier Disable Signal

• PowerPAD? TSSOP Packages

• Complete PoE Interface Plus DC-DC Controller

• Adapter ORing Support

• Programmable Frequency

• TPS23752 Supports Ultra-Low Power Sleep Modes

• –40°C to 125°C Junction Temperature Range

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The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE)powered device (PD) interface and a current-mode DC-DC controller optimized specifically forapplications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It alsoincludes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V passMOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source,current-mode control with slope compensation, blanking, and current limiting. Efficiency isenhanced at light loads by disabling synchronous rectification and entering variable frequencyoperation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a SleepMode feature. Sleep Mode disables the converter to minimize power consumption while stillgenerating the Maintain Power Signature (MPS) required by IEEE802.3at.