TPS2375-1 Datasheet, PDF (1/23 Pages) Texas Instruments – IEEE 802.3af PoE POWERED DEVICE CONTROLLERS WITH AUTO-RETRY

www.ti.com
D−8
PW−8
TPS2375-1
TPS2377-1
SLVS570 – MARCH 2005
IEEE 802.3af PoE POWERED DEVICE CONTROLLERS WITH AUTO-RETRY
FEATURES
• Auto-Retry After Current-Limit Fault
• TPS2375-1: IEEE 802.3af Thresholds
• TPS2377-1: Legacy Thresholds
• Fully Supports IEEE 802.3af Specification
• Integrated 0.58-Ω, 100-V, Low-Side Switch
• 15-kV System Level ESD Capable
• Programmable Inrush Current Control
• Fixed 450-mA Current Limit
• Open-Drain, Power-Good Reporting
• 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
PRODUCT SELECTOR
UVLO
Protection
Package
2375-1
802.3af
Auto-Retry
PW
2377-1
Legacy
Auto-Retry
D
2375
802.3af
Latch
D, PW
2376
Adjustable
Latch
D,PW
2377
Legacy
Latch
D,PW
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 TPS2375-1 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.
RJ-45
1
TX
Pair
2
DF01S
2 Places
4
5
Spare
Pair
7
8
Spare
Pair
3
RX
Pair
6
Data to
Ethernet PHY
DET
PG
ILIM
CLASS
RTN
Data to
Ethernet PHY
Notes:
1) Class 3 PD depicted
2) PG pullup resistor is optional.
Detect
Power Up
and
Classify Inrush
Input
Current
Class 3
Current
V _(PG-RTN)
V_DD
V_RTN
Note: All Voltages With Respect to VSS.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated