TPS2377| Datasheet

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data sheet
D-8 PW-8

TPS2375 TPS2376 TPS2377

www.ti.com............................................................................................................................................................ SLVS525B APRIL 2004 REVISED APRIL 2008

IEEE 802.3af PoE POWERED DEVICE CONTROLLERS
1

FEATURES
Fully Supports IEEE 802.3af Specification Integrated 0.58-, 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 2 3 4 ILIM CLASS DET VSS VDD N/C 8 7 6 1 2 3 4 TPS2376 (TOP VIEW) ILIM CLASS DET VSS VDD UVLO 8 7

PG RTN 5

6 PG 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

Data to Ethernet PHY

Detect

Classify Power Up & Inrush

SMAJ58A

R(DET) 24.9 kW, 1% DET ILIM R(ILIM) 178 kW, 1% CLASS R(ICLASS) 357 W, 1%

VDD

DF01S 2 Places

Input Current
100 kW
TO DC/DC CONVERTER

Class 3 Current V (PG-RTN)

PG
TPS2375

4 5 Spare Pair 7 8

0.1mF, 100 V 10 %

100 mF, 100 V RTN

VDD VRTN

Spare Pair

3 RX Pair 6 Data to Ethernet PHY Note: Class 3 PD Depicted. PG Pullup Resistor Is Optional.

VSS

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.