FEATURES APPLICATIONS
DESCRIPTION
V
DD
Input
Current
V
RTN
V
Detect Classify
Power Up
and
Inrush
Class 3
(PG-RTN)
Note: All Voltages With Respect to VSS.
Current
RX
Pair
TPS2375-1
SMAJ58A
0.1 F, 100 V, 10%m
24.9 kW
1%
VDD
VSS
CLASS
DET
RTN
PG
100 kW
(2)
1
3
6
4
5
7
8
TO DC/DC
CONVERTER
ILIM
178 kW
1%
2
RJ-45
DF01S
2 Places
Data to
Ethernet PHY
Data to
Ethernet PHY
R
DET
R
CLASS
357
1%
W
(1)
R
ILIM
47 F,m
100 V
Notes:
1) Class 3 PD depicted
2) PG pullup resistor is optional.
TX
Pair
Spare
Pair
Spare
Pair
TPS2375-1
TPS2377-1
SLVS570 – MARCH 2005
IEEE 802.3af PoE POWERED DEVICE CONTROLLERS WITH AUTO-RETRY
• VoIP Phones
• Auto-Retry After Current-Limit Fault
• WLAN Access Points
• TPS2375-1: IEEE 802.3af Thresholds
• Security Cameras
• TPS2377-1: Legacy Thresholds
• Internet Appliances
• Fully Supports IEEE 802.3af Specification
• POS Terminals
• Integrated 0.58- Ω , 100-V, Low-Side Switch
• 15-kV System Level ESD Capable
PRODUCT SELECTOR
• Programmable Inrush Current Control
2375-1 2377-1 2375 2376 2377
• Fixed 450-mA Current Limit
UVLO 802.3af Legacy 802.3af Adjustable Legacy
Protection Auto-Retry Auto-Retry Latch Latch Latch
• Open-Drain, Power-Good Reporting
Package PW D D, PW D,PW D,PW
• Industrial Temperature Range: -40 ° C to 85 ° C
• 8-Pin SOIC and TSSOP Packages
These easy-to-use 8-pin integrated circuits contain all of the features needed to develop an IEEE
802.3af-compliant powered device (PD). The TPS2375-1 and TPS2377-1 are second generation PDCs (PD
Controllers) featuring a 100-V ratings and true open-drain, power-good function. These devices are auto-retry
versions of selected TPS2375 family members. Information on the TPS2375/6/7 devices can be found on the
TPS2375/6/7 data sheet (SLVS525A ).
In addition to the basic functions of detection, classification, and undervoltage lockout (UVLO), these controllers
include an adjustable inrush limiting feature. The TPS2375-1 has 802.3af-compliant UVLO limits, and the
TPS2377-1 has legacy UVLO limits.
The TPS2375 family specifications incorporate a voltage offset of 1.5 V between its limits and the IEEE 802.3af
specifications to accommodate the required input diode bridges used to make the PD polarity insensitive.
Additional resources can be found on the TI Web site www.ti.com.
Figure 1. Typical Application Circuit and Start-Up Waveforms
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
