TPS23861 Datasheet, PDF (1/110 Pages) Texas Instruments – Quad Port Power-over-Ethernet PSE Controller

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS23861
SLUSBX9E – MARCH 2014 – REVISED MARCH 2016
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 T_PON 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
• TSSOP28 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 T_PON specification is
ensured whether in semi-automatic or automatic
mode.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
TPS23861PW
TSSOP (28)
9.80 mm x 6.60 mm
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
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.