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 for
applications requiring high efficiency over a wide load range.
The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also
includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass
MOSFET 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 is
enhanced at light loads by disabling synchronous rectification and entering variable frequency
The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep
Mode feature. Sleep Mode disables the converter to minimize power consumption while still
generating the Maintain Power Signature (MPS) required by IEEE802.3at.