TPS23841 MANAGER Datasheet
QUAD-PORT ETHERNET POWER SOURCING EQUIPMENT MANAGER
|Total Page||30 Pages|
SLUS745A – NOVEMBER 2006 – REVISED MAY 2007
HIGH-POWER, WIDE VOLTAGE RANGE, QUAD-PORT ETHERNET POWER SOURCING
• 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
• Wide Range Single Supply: 21.5 V up to 57 V
• ICUT = 615 mA, ILIM = 650 mA Nominal
• IEEE 802.3af Compatible
• Individual Port 15-bit A/D Converters
• Auto, Semi-Auto and Power Management
• Controlled Current Ramp Power-Up/Down for
• Over-Temperature Protection
• DC Disconnect Detection, Supports AC
• High-Speed 400-kHz I2C Interface
• Supports Legacy PD Detection
• PowerPAD™ Package
• Comprehensive Power Management Software
Available for MPS430 Microcontroller
• Medical/Industrial Applications at 24 V
• High Power Ethernet Enterprise Switches
• SOHO Hubs, Ethernet Hubs
• Ethernet High Power Mid-Spans
• High Power PSE Injectors
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
C1 PoE Xfmr
Up to 100m
of CAT 5A
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 © 2006–2007, Texas Instruments Incorporated
SLUS745A – NOVEMBER 2006 – REVISED MAY 2007
The TPS23841 has three internal supply buses (10 V, 6.3 V and 3.3 V) generated from the 48-V input supply.
These supplies are used to bias all internal digital and analog circuitry. Each supply has been brought out
separately for proper bypassing to insure high performance. The digital supply (3.3 V) is available for powering
external loads up to 2 mA. For more demanding loads it is highly recommended to use external buffers to
prevent system degradation. When the TPS23841 is initially powered up an internal Power-on-Reset (POR)
circuit resets all registers and sets all ports to the off state to ensure that the device is powered up in a known
safe operating state.
The TPS23841 has three modes of operation; auto mode (AM), semi-auto mode (SAM) and power management
• In auto mode the TPS23841 performs discovery, classification and delivery of power autonomously to a
compliant PD without the need of a micro-controller.
• In semi-auto mode the TPS23841 operates in auto mode but users can access the contents of all read status
registers and A/D registers through the I2C serial interface. All write control registers are active except for D0
through D3 of port control register 1 (Address 0010) for limited port control. The semi-auto mode allows the
TPS23841 to detect valid PD's without micro-controller intervention but adds a flexibility to perform power
• Power management mode (with a micro-controller) allows users additional capabilities of discovering
non-compliant (legacy) PDs, performing AC Disconnect and advanced power management system control
that are based on real time port voltages and currents. All functions in this mode are programmed and
controlled through read/write registers over the I2C interface. This allows users complete freedom in
detecting and powering devices. A comprehensive software package is available that mates the power of the
TPS23841 with the MSP430 micro-controller.
TPS23841 integrated output stage provides port power and low-side control. The internal low-side circuitry is
designed with internal current sensing so there are no external resistors required. The output design ensures the
power switches operate in the fully enhanced mode for low power dissipation.
The I2C interface allows easy application of opto-coupler circuitry to maintain Ethernet port isolation when a
ground based micro-controller is required. The TPS23841 five address pins (A1–A5) allow the device to be
addressed at one of 31 possible I2C addresses. Per-port write registers separately control each port state
(discovery, classification, legacy, power up, etc) while the read registers contain status information of the entire
process along with parametric values of discovery, classification, and real-time port operating current, voltage
and die temperature.
The proprietary 15-bit integrating A/D converter is designed to meet the harsh environment where the PSEPM
resides. The converter is set for maximum rejection of power line noise allowing it to make accurate
measurements of line currents during discovery, classification and power delivery for reliable power
The TPS23841 is available in either 64-pin PowerPAD™ down (PAP) or 64-pin PowerPAD up (PJD) packages.
TA = TJ
–40°C to 125°C
TQFP – 64 (PAP)(2)
TQFP – 64 (PJD)(2)
(1) The PAP and PJD packages are available taped and reeled. Add R suffix to device type
(e.g.TPS23841PAPR) to order quantities of 1,000 devices per reel.
(2) PAP = PowerPad down, PJD = PowerPad up.
2 Submit Documentation Feedback
|Features||www.ti.com TPS23841 SLUS745A – NOVEMB ER 2006 – REVISED MAY 2007 HIGH-POWE R, WIDE VOLTAGE RANGE, QUAD-PORT ETHERN ET POWER SOURCING EQUIPMENT MANAGER FE ATURES • Quad-Port Power Management W ith Integrated Switches and Sense Resis tors • High Power PoE up to 25 W at P D Input Operating from a 53-V Minimum I nput Power Rail • Wide Range Single S upply: 21.5 V up to 57 V • ICUT = 615 mA, ILIM = 650 mA Nominal • IEEE 802 .3af Compatible • Individual Port 15- bit A/D Converters • Auto, Semi-Auto and Power Management Modes • Controll ed Current Ramp Power-Up/Down for EMI R eduction • Over-Temperature Protectio n • DC Disconnect Detection, Supports AC Disconnect • High-Speed 400-kHz I 2C Interface • Supports Legacy PD Det ection • PowerPAD™ Package • Comp rehensive Power Management Software Ava ilable for MPS430 Microcontroller APPL ICATIONS • Medical/Industrial Applica tions at 24 V • High Power Ethernet E nterprise Switches • SOHO Hubs, Ethernet Hubs • Ethernet High Power Mid-Spans • High Power PSE Inject.|
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