TPS23841_07 Datasheet, PDF (1/52 Pages) Texas Instruments – HIGH-POWER, WIDE VOLTAGE RANGE, QUAD-PORT ETHERNET POWER SOURCING EQUIPMENT MANAGER

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TPS23841
SLUS745 – NOVEMBER 2006
HIGH-POWER, WIDE VOLTAGE RANGE, QUAD-PORT ETHERNET POWER SOURCING
EQUIPMENT MANAGER
FEATURES
• Quad-Port Power Management With Integrated
Switches and Sense Resistors
• High Power PoE up to 25 W at PD Input
Operating from a 53-V Minimum Input Power
Rail
• Wide Range Single Supply: 21.5 V up to 57 V
• I_CUT = 615 mA, I_LIM = 650 mA Nominal
• IEEE 802.3af Compatible
• Individual Port 15-bit A/D Converters
• Auto, Semi-Auto and Power Management
Modes
• Controlled Current Ramp Power-Up/Down for
EMI Reduction
• Over-Temperature Protection
• DC Disconnect Detection, Supports AC
Disconnect
• High-Speed 400-kHz I²C Interface
• Supports Legacy PD Detection
• PowerPAD™ Package
• Comprehensive Power Management Software
Available for MPS430 Microcontroller
APPLICATIONS
• Medical/Industrial Applications at 24 V
• High Power Ethernet Enterprise Switches
• SOHO Hubs, Ethernet Hubs
• Ethernet High Power Mid-Spans
• High Power PSE Injectors
DESCRIPTION
The TPS23841 is a high-power, wide voltage range,
quad-port sourcing equipment manager. The
TPS23841 can provide up to 570 mA per port over a
wide temperature range (-40°C to +125°C). Each
port may operate from 21.5 V up to 57 V. The
integrated output eliminates two external
components per port (MOSFET and sense resistor)
and survives 100-V transients. Four individual 15-bit
A/D converters are used to measure signature
resistance, voltage, current and die temperature,
resulting in a simple and robust PSE solution. The
TPS23841 comes with a comprehensive software
solution to meet the most demanding applications
which can serve as a core for all PoE system
designs.
TYPICAL APPLICATION
+55V
PSE
D1
FB1
F1
Z
Px
TPS23841
TX
High-current
C1 ^{PoE Xfmr}
Nx
V_POE
RTN
RETx
SCL
SDA_I
SDA_O
RX
Z
FB2
Optional
MSP430
Micro
Up to 100m
of CAT 5A
RJ45
RJ45
3
3
6
6
1
1
2
2
4
4
5
5
7
7
8
8
TX
High-current
PoE Xfmr
RX
PD
VDD
TPS2376-H
DET
CLASS
RTN
VSS
DC/DC
Converter
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated