0
ACTIVE
PoE standards supported |
802.3at Type 1 (802.3af), 802.3at Type 2 |
PD power level |
13W, 25W |
DC/DC control |
PD and DC/DC |
Vin (max) (V) |
57 |
Vin (min) (V) |
9.2 |
PoE current limit (min) (mA) |
850 |
PoE inrush limit (mA) (typ) (A) |
0.14 |
rDS(on) per FET (typ) (mΩ) |
450 |
Features |
Primary-side adapter priority, Sleep Mode, Thermal shutdown, VFO |
Fault response |
Auto Retry |
Operating temperature range (°C) |
-40 to 85 |
Rating |
Catalog |
HTSSOP (PWP)-20-41.6 mm² 6.5 x 6.4
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 operation (VFO).
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.
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