Datasheet

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D−8 PW−8

FEATURES APPLICATIONS

VSS

CLASS UVLO

DET

RTN

VDD

ILIM

VSS

CLASS N/C

DET

RTN

VDD

ILIM

TPS2375/77

(TOP VIEW)

TPS2376

(TOP VIEW)

DESCRIPTION

TPS2375

SMAJ58A

Data to

Ethernet PHY

VDD

VSS

CLASS

DET

RTN

Data to

Ethernet

PHY

TO DC/DC

CONVERTER

ILIM

RJ−45

DF01S

2 Places

Note: Class 3 PD Depicted.

PG Pullup Resistor Is Optional.

Pair

Spare

Pair

Spare

Pair

Input

Current

RTN

Detect Classify

Power Up & Inrush

Class 3

(PG-RTN)

100

100 V

100 mF,

(DET)

24.9 kW,

1 %

(ILIM)

178 kW,

1 %

(ICLASS)

357 W,

1 %

100 V

0.1mF,

10 %

Note: All Voltages With Respect to VSS.

Current

data sheet

TPS2375

TPS2376

TPS2377

www.ti.com

............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008

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

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.

Summary of content (25 pages)

PAGE 1
data sheet D−8 TPS2375 TPS2376 TPS2377 PW−8 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 IEEE 802.3af PoE POWERED DEVICE CONTROLLERS FEATURES APPLICATIONS • • • • • • • • • • • • • • • • 1 Fully Supports IEEE 802.3af Specification Integrated 0.
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data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
PAGE 3
data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................
PAGE 4
data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com ELECTRICAL CHARACTERISTICS (continued) V(VDD) = 48 V, R(DET) = 24.9 kΩ, R(CLASS) = 255 Ω, R(ILIM) = 178 kΩ, and –40°C ≤ TJ ≤ 125°C, unless otherwise noted. Positive currents are into pins.
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data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 DEVICE INFORMATION FUNCTIONAL BLOCK DIAGRAM 12 V VDD 8 DET 3 Detection Comparator + − 22 V CLASS 2 10 V Regulator Classification Comparator + PG 6 PG Comparator − 1.5 V & 10 V Delay 150 mS − + S R Q 0 = Fault 0 = Inrush S R 2.
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data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com TERMINAL FUNCTIONS PIN NAME PIN NUMBER I/O DESCRIPTION 1 O Connect a resistor from ILIM to VSS to set the start-up inrush current limit. The equation for calculating the resistor is shown in the detailed pin description section for ILIM.
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data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 RTN: This pin provides the switched negative power rail used by the downstream circuits. The operational and inrush current limit control current into the pin.
PAGE 8
data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com TYPICAL CHARACTERISTICS Graphs over temperature are interpolations between the marked data points. I(VDD) + I(RTN) IN DETECTION 6 11.
PAGE 9
data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 TYPICAL CHARACTERISTICS (continued) Graphs over temperature are interpolations between the marked data points. TPS2376 UVLO FALLING vs TEMPERATURE TPS2377 UVLO RISING vs TEMPERATURE 1.929 35.20 1.928 35.15 TPS2377 UVLO FALLING vs TEMPERATURE 30.65 1.
PAGE 10
data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com APPLICATION INFORMATION OVERVIEW The IEEE 802.3af specification defines a process for safely powering a PD over a cable, and then removing power if a PD is disconnected.
PAGE 11
data sheet TPS2375 TPS2376 TPS2377 Operational Mode www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 PD Powered Idle Classification Detection V(VDD) V(CU_H) 1.4V V(CL_ON) V(UVLO_F) V(UVLO_R) V(CU_OFF) Figure 19. Threshold Voltages DETECTION This feature of IEEE 802.
PAGE 12
data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com UNDERVOLTAGE LOCKOUT (UVLO) The TPS2375 incorporates an undervoltage lockout (UVLO) circuit that monitors line voltage to determine when to apply power to the downstream load and allow the PD to power up. The IEEE 802.
PAGE 13
data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 MAINTAIN POWER SIGNATURE Once a valid PD has been detected and powered, the PSE uses the maintain power signature (MPS) to determine when to remove power from the PI. The PSE removes power from that output port if it detects loss of MPS for 300 ms or more.
PAGE 14
data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com POWER SYSTEM DESIGN The PSE is a power and current limited source, which imposes certain constraints on the PD power supply design.
PAGE 15
data sheet TPS2375 TPS2376 TPS2377 www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008 Option 1 consists of ORing power to the output of the PoE dc/dc converter. This option is preferred in cases where PoE is added to an existing design that uses a low-voltage wall adapter.
PAGE 16
TPS2375 TPS2376 TPS2377 data sheet SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com Input Capacitor The IEEE 802.3af requires a PD input capacitance between 0.05 µF and 0.12 µF during detection. This capacitor should be located directly adjacent to the TPS2375 as shown in Figure 1.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 11-Jun-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS2375DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TPS2375PWR TSSOP PW 8 2000 330.0 12.4 7.0 3.6 1.6 8.0 12.0 Q1 TPS2376DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TPS2376PWR TSSOP PW 8 2000 330.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS2375DR SOIC D 8 2500 340.5 338.1 20.6 TPS2375PWR TSSOP PW 8 2000 367.0 367.0 35.0 TPS2376DR SOIC D 8 2500 367.0 367.0 35.0 TPS2376PWR TSSOP PW 8 2000 367.0 367.0 35.0 TPS2377DR SOIC D 8 2500 367.0 367.0 35.0 TPS2377PWR TSSOP PW 8 2000 367.0 367.0 35.
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