TPS23751 Texas instruments

TPS23751

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TPS23751

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Описание

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.

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

Vin (min) (V)	9.2
Vin (max) (V)	57
PoE current limit (min) (mA)	850
PoE inrush limit (mA) (typ)	140
rDS(on) per FET (typ) (mΩ)	450
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
Fault response	Auto Retry
Features	Primary Side Adapter Priority, Thermal shutdown, VFO
Operating temperature range (°C)	-40 to 85
Rating	Catalog