Datasheet

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RJ45

Connector

TX+ (1)

TX- (2)

RX+ (3)

RX- (6)

(4)

(7)

(5)

(8)

To PHY

Hot Plug Controller

In-rush and Fault

Current Limiting

DC-DC

Converter

Controller

Current Mode

IEEE 802.3af

Interface

UVLO

Signature Detection

Classification

LM5070

VDC

LM5070

www.ti.com

SNVS308G –OCTOBER 2004–REVISED APRIL 2013

LM5070 Integrated Power Over Ethernet PD Interface and PWM Controller

Check for Samples: LM5070

FEATURES

DESCRIPTION

The LM5070 power interface port and pulse width

• Fully Compliant 802.3af Power Interface Port

modulation (PWM) controller provides a complete

• 80V, 1Ω, 400 mA Internal MOSFET

integrated solution for Powered Devices (PD) that

• Programmable Inrush Current Limit

connect into Power over Ethernet (PoE) systems. The

LM5070 integrates an 80V, 400mA line connection

• Detection Resistor Disconnect Function

switch and associated control for a fully IEEE 802.3af

• Programmable Classification Current

compliant interface with a full featured current mode

• Programmable Under-voltage Lockout with

pulse width modulator dc-dc converter. All power

Programmable Hysteresis

sequencing requirements between the controller

interface and switch mode power supply (SMPS) are

• Thermal Shutdown Protection

integrated into the IC. Two options are available

• Current Mode Pulse Width Modulator

providing either an 80% maximum duty cycle limit

• Supports Both Isolated and Non-Isolated

with slope compensation (on the –80 suffix) device or

Applications

a 50% maximum duty cycle limit and no slope

compensation on the (–50 suffix) device.

• Error Amplifier and Reference for Non-Isolated

Applications

PACKAGES

• Programmable Oscillator Frequency

• TSSOP-16

• Programmable Soft-Start

• WSON-16 (5 mm x 5 mm)

• 80% Maximum Duty Cycle Limiter, Slope

Compensation (-80 device)

• 50% Maximum Duty Cycle Limiter, No Slope

Compensation (-50 device)

• 800 mA Peak Gate Driver

Block Diagrams

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.

2All trademarks are the property of their respective owners.

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 (24 pages)

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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 LM5070 Integrated Power Over Ethernet PD Interface and PWM Controller Check for Samples: LM5070 FEATURES DESCRIPTION • • • • • • The LM5070 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5070 integrates an 80V, 400mA line connection switch and associated control for a fully IEEE 802.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com +3.3V LM5070 VIN VIN RSIG VIN < 10V Switch RCLASS Bandgap Regulator OUT RCLP Programmable Inrush Current VEE VCC Internal High Voltage Regulator 5V SMPS Controller VEE CS RTN C OMP SS RT ARTN FB Figure 1. Simplified Block Diagram and Application Connection Diagram VIN 1 16 ARTN RSIG 2 15 SS RCLASS 3 14 RT UVLO 4 13 CS UVLORTN 5 12 COMP RCLP 6 11 FB VEE 7 10 VCC RTN 8 9 OUT Figure 2.
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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 PIN DESCRIPTIONS Pin Name 1 VIN 2 RSIG 3 RCLASS 4 UVLO 5 UVLORTN 6 RCLP 7 Description Application Information System high potential input. The diode “OR” of several lines entering the PD, it is the more positive input potential. Signature resistor pin. Connect a 25kΩ signature resistor from VIN to this pin for signature detection. Classification resistor pin.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Absolute Maximum Ratings (1) (2) VIN ,RTN to VEE -0.3V to 80V RSIG to VIN -12V to 0V UVLO to VEE -0.3V to 57V UVLORTN -0.3V to 13V RCLASS, RCLP to VEE -0.3V to 7V ARTN to RTN -0.3V to 0.3V VCC, OUT to ARTN -0.3V to 16V All other inputs to ARTN -0.
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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 Electrical Characteristics(1) (continued) Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full operating junction temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, RT = 30.3kΩ. Symbol ILIM Min Typ Max Units Default Current Limit Parameter VEE = 0V, RTN = 3.0V, Temp = -40°C to 125°C Conditions 325 390 420 mA Current Limit Programming Accuracy VEE = 0V, RTN = 3.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Electrical Characteristics(1) (continued) Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full operating junction temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, RT = 30.3kΩ. Symbol Parameter Conditions Min Typ Max Units V Output Section Output High Saturation Iout = 50mA, VCC - VOUT 0.25 0.75 Output Low Saturation Iout = 100mA 0.25 0.
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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 Typical Performance Characteristics Inrush Current Limit vs RCLP Resistor 400 450 395 400 INRUSH CURRENT LIMIT (mA) DEFAULT CURRENT LIMIT (mA) Default Current Limit vs Temperature 390 385 380 375 370 365 350 300 250 200 150 100 50 0 30 360 -40 -20 0 20 40 60 80 100 120 40 TEMPERATURE (oC) 50 60 70 80 90 RCLP RESISTOR (k:) 100 110 Figure 3. Figure 4.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) VCC vs ICC 406 9 404 8 402 7 400 6 VCC (V) FREQUENCY (kHz) Oscillator Frequency vs Temperature RT = 15.2 kΩ 398 5 396 4 394 3 392 2 390 -40 1 -20 0 20 40 60 80 0 100 120 5 10 15 20 25 ICC (mA) TEMPERATURE (oC) Figure 9. Figure 10. Input Current vs Input Voltage UVLO Threshold vs Temperature 3 2.05 2.04 2.03 2.02 2 UVLO VTH (V) INPUT CURRENT (mA) 2.
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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 BLOCK DIAGRAMS VIN 10 PA + VBG VCC EN - LT20V 1.5V + - UVLO 2V 60V + + - 2V Power OK LOCKOUT LOCAL_EN OUT Switch Mode Power Supply Controller UVLORTN 5V VIN RT See Figure 3 for Detail + 1.5V EN SS CS - COMP RCLASS Thermal Limit RSIG + - 10V + - 1.5V FB ARTN VIN + - RCLP Gate Control VEE RTN Figure 13.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Detailed Operating Description The LM5070 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. Major features of the PD interface portion of the IC include detection, classification, programmable inrush current limit, thermal limit, programmable undervoltage lockout, and current limit monitoring.
PAGE 11
LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 Classification To classify the PD, the PSE will present a voltage between 14.5V and 20.5V to the PD. The LM5070 enables classification mode at a nominal input voltage of 11.5V. An internal 1.5V linear regulator and an external resistor connected to the RCLASS pin provide classification programming current. Table 2 shows the external classification resistor required for a particular class.
PAGE 12
LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Some legacy PSEs may not be able to supply the IEEE maximum power of 15W to the PD, and this can be a problem during startup. Low power PDs that are used in these legacy systems will require a lower startup current limit. The LM5070 can be programmed for a reduced inrush current limit level with a resistor at RCLP pin. The programmable inrush current limit range is 75mA to 390mA.
PAGE 13
LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 The LM5070 current sense and PWM comparators are very fast, and may respond to short duration noise pulses. Layout considerations are critical for the current sense filter and sense resistor. The capacitor associated with the CS filter must be located very close to the device and connected directly to the pins of the controller (CS and ARTN).
PAGE 14
LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.com Gate Driver and Maximum Duty Cycle Limit The LM5070 provides an internal gate driver (OUT), which can source and sink a peak current of 800mA. The LM5070 is available in two duty cycle limit options. The maximum output duty cycle is typically 80% for the LM5070-80 option and precisely equal to 50% for the LM5070-50 option.
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LM5070 www.ti.
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LM5070 SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 www.ti.
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LM5070 www.ti.com SNVS308G – OCTOBER 2004 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision F (April 2013) to Revision G • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LM5070MTCX-50/NOPB TSSOP LM5070MTCX-80/NOPB LM5070SD-50/NOPB SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant PW 16 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 TSSOP PW 16 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 WSON NHQ 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM5070MTCX-50/NOPB TSSOP PW 16 2500 367.0 367.0 35.0 LM5070MTCX-80/NOPB TSSOP PW 16 2500 367.0 367.0 35.0 LM5070SD-50/NOPB WSON NHQ 16 1000 210.0 185.0 35.0 LM5070SD-80/NOPB WSON NHQ 16 1000 210.0 185.0 35.0 LM5070SDX-50/NOPB WSON NHQ 16 4500 367.0 367.0 35.
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MECHANICAL DATA NHQ0016A SDA16A (Rev A) www.ti.
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