TPS23861 Controller Datasheet

TPS23861 Datasheet, PDF, Equivalent


Part Number

TPS23861

Description

IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TPS23861
SLUSBX9I – MARCH 2014 – REVISED JULY 2019
TPS23861 IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller
1 Features
1 IEEE 802.3at Quad Port PSE controller
– Auto Detect, classification
– Auto Turn-On and disconnect
– Efficient 255-mΩ sense resistor
• Pin-Out enables Two-Layer PCB
• Kelvin Current Sensing
• 4-Point detection
• Automatic mode – as shipped
– No External terminal setting required
– No Initial I2C communication required
• Semi-Automatic mode – set by I2C command
– Continuous Identification and Classification
– Meets IEEE 400-ms TPON specification
– Fast-Port shutdown input
– Operates best when used in conjunction with
system reference code
http://www.ti.com/product/TPS23861/toolssoftw
are
• Optional I2C control and monitoring
• –40°C to 125°C Temperature range
• TSSOP 28 Package 9.8 mm x 6.6 mm
2 Applications
• Ethernet switches and routers
• Surveillance NVR and DVRs
• Residential gateways
• PoE Pass-Through systems
• Wireless backhaul
Simplified Schematic
3.3 V 48 V
3 Description
The TPS23861 is an easy-to-use, flexible,
IEEE802.3at PSE solution. As shipped, it
automatically manages four 802.3at ports without the
need for any external control.
The TPS23861 automatically detects Powered
Devices (PDs) that have a valid signature, determines
power requirements according to classification and
applies power. Two-event classification is supported
for type-2 PDs. The TPS23861 supports DC
disconnection and the external FET architecture
allows designers to balance size, efficiency and
solution cost requirements.
The unique pin-out enables 2-layer PCB designs via
logical grouping and clear upper and lower
differentiation of I2C and power pins. This delivers
best-in-class thermal performance, Kelvin accuracy
and low-build cost.
In addition to automatic operation, the TPS23861
supports Semi-Auto Mode via I2C control for precision
monitoring and intelligent power management.
Compliance with the 400-ms TPON specification is
ensured whether in semi-automatic or automatic
mode.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE
TPS23861
TSSOP (28)
9.80 mm x 6.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
TOP CONDUCTORS
FETs Uniformly Spread Over Surface
VDD VPWR
RESET
DRAINn
SHTDWN
GATEn
TPS23861
SENn
A3 KSENSx
SCL INT
SDAI
SDAO
AIN AOUT
AGND DGND
100 nF
100 V
PORTn
47
22
255 m
BOTTOM GND PLANE
Continuous, Robust Backside GND Plane
Note: only port n shown
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS23861
TPS23861
SLUSBX9I – MARCH 2014 – REVISED JULY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 5
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings.............................................................. 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 7
6.6 Timing Requirements .............................................. 11
6.7 Switching Characteristics ........................................ 12
6.8 Typical Characteristics ............................................ 16
7 Detailed Description ............................................ 21
7.1 Overview ................................................................. 21
7.2 Functional Block Diagram ....................................... 25
7.3 Feature Description................................................. 25
7.4 Device Functional Modes........................................ 40
7.5 Register Map – I2C-Addressable ............................ 45
8 Application and Implementation ........................ 85
8.1 Introduction to PoE ................................................. 85
8.2 Application Information............................................ 85
8.3 Typical Application .................................................. 87
8.4 System Examples ................................................... 93
9 Power Supply Recommendations...................... 97
9.1 VDD......................................................................... 97
9.2 VPWR ..................................................................... 97
9.3 VPWR-RESET Sequencing .................................... 97
10 Layout................................................................... 98
10.1 Layout Guidelines ................................................. 98
10.2 Layout Example .................................................... 99
11 Device and Documentation Support ............... 100
11.1 Documentation Support ..................................... 100
11.2 Receiving Notification of Documentation
Updates.................................................................. 100
11.3 Community Resources........................................ 100
11.4 Trademarks ......................................................... 100
11.5 Electrostatic Discharge Caution .......................... 100
11.6 Glossary .............................................................. 100
12 Mechanical, Packaging, and Orderable
Information ......................................................... 100
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision H (November 2017) to Revision I
Page
• Added figure titles to the Application Curves........................................................................................................................ 92
Changes from Revision G (October 2016) to Revision H
Page
• Deleted "or unknown" from Auto subsection ........................................................................................................................ 42
• Deleted "and Auto Modes" from TSTART Indicators of Detect and Class Failures subsection........................................... 44
• Changed fault conditions for Auto mode in Detect and Class Failure Indicators table ........................................................ 44
• Added information to Step 2 in Start/ILIM Event Register subsection ................................................................................. 53
Changes from Revision F (July 2016) to Revision G
Page
• Deleted the MAX value of 150 mA from IGO- in the Electrical Characteristics ........................................................................ 8
Changes from Revision E (March 2016) to Revision F
Page
Legacy Device Detection, Changed the paragraph, "in general,..." ..................................................................................... 30
• Changed section From: Independent Operation when the Bit is Set To: Independent Operation when the AUTO Bit
is Set..................................................................................................................................................................................... 34
I2C Slave Address and AUTO Bit Programming, Added NOTE: "When using I2C scan...".................................................. 37
Start/ILIM Event Register, Changed the third list item From: "Detect fault or classification unknown,.." To:
"Overcurrent or class mismatch on second finger in Semi-Auto or Manual Mode." ........................................................... 53
Timing Configuration Register, Added new NOTE under TLIM[1:0]: " If ILIM and ICUT are set to same value..." ............ 61
Timing Configuration Register, Added new NOTE under TICUT[1:0]: " If ILIM and ICUT are set to same value..." .......... 62
Two-Event Classification Register, Changed the second list item to include: "CLEn is set or a" ....................................... 67
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Copyright © 2014–2019, Texas Instruments Incorporated
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Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TPS23861 SLUSBX9I – MARCH 201 4 – REVISED JULY 2019 TPS23861 IEEE 8 02.3at Quad Port Power-over-Ethernet PS E Controller 1 Features •1 IEEE 802. 3at Quad Port PSE controller – Auto D etect, classification – Auto Turn-On and disconnect – Efficient 255-mΩ se nse resistor • Pin-Out enables Two-La yer PCB • Kelvin Current Sensing • 4-Point detection • Automatic mode as shipped – No External terminal s etting required – No Initial I2C comm unication required • Semi-Automatic m ode – set by I2C command – Continuo us Identification and Classification Meets IEEE 400-ms TPON specification – Fast-Port shutdown input – Operat es best when used in conjunction with s ystem reference code http://www.ti.com/ product/TPS23861/toolssoftw are • Opt ional I2C control and monitoring • 40°C to 125°C Temperature range • TSSOP 28 Package 9.8 mm x 6.6 mm 2 Applications • Ethernet switches and routers • Surveillance NVR and DVRs • Re.
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