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reference designTPS23751

Texas Instruments TPS23751

IEEE 802.3at PoE Interface and Green-mode DC/DC Controller

Overview

TopologyBuck Converter
Input voltage0-57 V
Switching frequency226-276 kHz
Output 15 V / 4.5 A
IC revisionC

Description

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.

Features

  • 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 RangeREMARK:-L1=3.3uH used

Typical applications

  • Multiband Access Points
  • Video and VoIP Telephones
  • IEEE 802.3at-Compliant Devices
  • Pico-Base Stations
  • Security Cameras

More information

Parts approved by Texas Instruments

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Order Code
Data­sheet
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Product series
L(nH)
IR(A)
ISAT(A)
fres(MHz)
Mount
LR(nH)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
Material
SamplesAvailability & Sample
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744305033
SPECWE-HCM SMT High Current Flat Wire Inductor, 330 nH, 26 A

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
Inductance330 nH
Rated Current26 A
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Self Resonant Frequency22 MHz
MountSMT 
Rated Inductance270 nH
Saturation Current @ 10%23.6 A
Saturation Current @ 30%27.7 A
DC Resistance0.155 mΩ
MaterialMnZn 
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7440690033
SPECWE-TPC SMT Tiny Power Inductor, 3300 nH, 2.55 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-TPC SMT Tiny Power Inductor
Inductance3300 nH
Rated Current2.55 A
Saturation Current2.3 A
Self Resonant Frequency40 MHz
MountSMT 
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–
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