TPS2375 Datasheet, PDF (1/21 Pages) Texas Instruments – IEEE 802.3af PoE POWERED DEVICE CONTROLLERS

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D−8
PW−8
TPS2375
TPS2376
TPS2377
SLVS525A – APRIL 2004 – REVISED SEPTEMBER 2004
IEEE 802.3af PoE POWERED DEVICE CONTROLLERS
FEATURES
• Fully Supports IEEE 802.3af Specification
• Integrated 0.58-Ω, 100-V, Low-Side Switch
• 15-kV System Level ESD Capable
• Supports Use of Low-Cost Silicon Rectifiers
• Programmable Inrush Current Control
• Fixed 450-mA Current Limit
• Fixed and Adjustable UVLO Options
• Open-Drain, Power-Good Reporting
• Overtemperature Protection
• Industrial Temperature Range: -40°C to 85°C
• 8-Pin SOIC and TSSOP Packages
APPLICATIONS
• VoIP Phones
• WLAN Access Points
• Security Cameras
• Internet Appliances
• POS Terminals
TPS2375/77
(TOP VIEW)
1 _ILIM
2
CLASS
3
DET
4
VSS
VDD ⁸
N/C ⁷
6
PG
RTN ⁵
TPS2376
(TOP VIEW)
1 _ILIM
2
CLASS
3
DET
4
VSS
VDD ⁸
UVLO ⁷
PG ⁶
RTN ⁵
DESCRIPTION
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 family is a second generation PDC (PD Controller) featuring
100-V ratings and a true open-drain, power-good function.
In addition to the basic functions of detection, classification and undervoltage lockout (UVLO), these controllers
include an adjustable inrush limiting feature. The TPS2375 has 802.3af compliant UVLO limits, the TPS2377 has
legacy UVLO limits, and the TPS2376 has a programmable UVLO with a dedicated input pin.
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.
RJ−45
1
TX
Pair
2
DF01S
2 Places
4
5
Spare
Pair
7
8
Spare
Pair
Data to
Ethernet
PHY
0.1mF,
100 V
10 %
R(DET)
24.9 kW,
1%
DET
ILIM
R(ILIM)
178 kW,
1%
CLASS
R(ICLASS)
357 W,
1%
100
kW
PG
100 mF,
100 V
RTN
Detect Classify Power Up & Inrush
Input
Current
Class 3
Current
V _(PG-RTN)
VDD
VRTN
3
RX
Pair
6
Data to
Ethernet PHY
Note: Class 3 PD Depicted.
PG Pullup Resistor Is Optional.
Note: All Voltages With Respect to VSS.
Figure 1. Typical Application Circuit and Startup 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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated