D−8

PW−8

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FEATURES

APPLICATIONS

DESCRIPTION

VDD

Input

Current

VRTN

V

Detect

Classify

Power Up

and

Inrush

Class 3

(PG-RTN)

Note: All Voltages With Respect to VSS.

Current

RX

Pair

CLASS

DET

RTN

PG

1

3

6

4

5

7

8

ILIM

2

RJ-45

DF01S

2 Places

Data to

Ethernet PHY

Data to

Ethernet PHY

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.