D−8

PW−8

1

FEATURES

APPLICATIONS

1

2

3

4

5

6

7

8

VSS

CLASS

UVLO

DET

RTN

PG

VDD

ILIM

1

2

3

4

5

6

7

8

VSS

CLASS

N/C

DET

RTN

PG

VDD

ILIM

TPS2375/77

(TOP VIEW)

TPS2376

(TOP VIEW)

DESCRIPTION

Data to

Ethernet PHY

CLASS

DET

RTN

PG

Data to

Ethernet

PHY

1

3

6

4

5

7

8

ILIM

2

RJ−45

DF01S

2 Places

Note: Class 3 PD Depicted.

PG Pullup Resistor Is Optional.

TX

Pair

RX

Pair

Spare

Pair

Spare

Pair

VDD

Input

Current

VRTN

V

Detect

Classify Power Up & Inrush

Class 3

(PG-RTN)

100

kW

100 V

100 mF,

24.9 kW,

1 %

178 kW,

1 %

357 W,

1 %

100 V

0.1mF,

10 %

Note: All Voltages With Respect to VSS.

Current

data sheet

TPS2375

TPS2376

TPS2377

IEEE 802.3af PoE POWERED DEVICE CONTROLLERS

• VoIP Phones

• Fully Supports IEEE 802.3af Specification

• WLAN Access Points

• Integrated 0.58-Ω, 100-V, Low-Side Switch

• Security Cameras

• 15-kV System Level ESD Capable

• Internet Appliances

• Supports Use of Low-Cost Silicon Rectifiers

• POS Terminals

• 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

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.

Figure 1. Typical Application Circuit and Startup Waveforms

1

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 © 2004–2008, 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.