PM8805

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IEEE 802.3bt PoE-PD interface with embedded dual active bridge

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  • The PM8805 is a system-in-package for smart power supply of Power over Ethernet (PoE) Powered Devices (PD) and it is applicable for power level up to 99.9 W.

    It embeds: two active bridges and their driving circuitry, a charge pump to drive the high-side MOSFETs, the hot swap MOSFET and the interface compliant with IEEE 802.3bt.
    The device performs the physical layer classification, providing the indication of successful PSE type identification. A 4-pair PSE is identified and the information is available by a dedicated matrix of Tx signals.
    The device works with power either from the Ethernet cable or from an external power source such as a wall adapter, with possible prevalence of the auxiliary source with respect to the PoE.
    The PM8805 is suitable to build the interface section of PoE switch mode power supplies targeting the highest conversion efficiency. It provides a PGD signal that can be used to enable a PWM controller, a DC-DC converter or an LED driver.

    Key Features

    • Dual active bridge, hot swap MOSFETand PoE-PD interface in a system-in-package
    • 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active bridge.
    • 100 V, 0.1 Ω high-side N-ch hot swap MOSFET
    • PoE-PD single-signature interface compliant with IEEE 802.3bt / at / af
    • Supports 4-pair PoE applications
    • Supports 12 V auxiliary sources
    • Identifies which kind of PSE (standard or legacy) is connected with and provides successful IEEE802.3bt / at / af classification indication as a combination of the T0, T1 and T2 signals (open drain)
    • Smart operational modes
    • Programmable classification current with 3.3 ms delay.
    • Optional Autoclass feature
    • Advanced energy-saving MPS timings
    • Two-step hot swap current protection: DC with 1 ms delay and short-circuit with 10 us delay.
    • Controlled pre-charge of the output capacitor
    • PGD signal (open drain) to enable an external PWM controller.
    • Thermal shutdown protection

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Part Number
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Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
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PM8805TR QFN 8x8x1 43L P 0.5 6 Dice pad Tape And Reel
Active
3.6775 1000 EAR99 - Check Availability

Distributor availability ofPM8805TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 160 1 Order Now
ARROW EUROPE 500 0 Order Now
Newark Element14 AMERICA 50 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 100 1 Order Now
Farnell Element14 EUROPE 225 1 Order Now

Distributor reported inventory date: 2019-12-13

Distributor Name

DIGIKEY

Stock

160

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

50

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

225

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-13

Buy now

PM8805TR

Package

QFN 8x8x1 43L P 0.5 6 Dice pad

Packing Type

Tape And Reel

Unit Price (US$)

3.6775*

Distributor availability ofPM8805TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 160 1 Order Now
ARROW EUROPE 500 0 Order Now
Newark Element14 AMERICA 50 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 100 1 Order Now
Farnell Element14 EUROPE 225 1 Order Now

Distributor reported inventory date: 2019-12-13

Distributor Name

DIGIKEY

Stock

160

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

50

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

225

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-13

Marketing Status

Active

Unit Price (US$)

3.6775

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS12813
      IEEE 802.3bt PoE-PD interface with embedded dual active bridge
      2.0
      1.68 MB
      PDF
      DS12813

      IEEE 802.3bt PoE-PD interface with embedded dual active bridge

    • Description Version Size Action
      AN3373
      IEEE802.3at compliant PD + PS design based on PM8803 low power, synchronous flyback PoE converter
      1.0
      1.23 MB
      PDF
      AN3387
      PM8803 layout guidelines
      1.0
      944.44 KB
      PDF
      AN3373

      IEEE802.3at compliant PD + PS design based on PM8803 low power, synchronous flyback PoE converter

      AN3387

      PM8803 layout guidelines

    • Description Version Size Action
      AN5207
      12 V/8 A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design
      2.0
      2.85 MB
      PDF
      AN5190
      5 V/20 A, active clamp forward converter, Power Over Ethernet (PoE) - IEEE 802.3bt compliant reference design
      2.0
      3.24 MB
      PDF
      AN5237
      High power Poe PD, 3V3 up to 20 A active clamp forward evaluation board
      1.0
      3.23 MB
      PDF
      AN5174
      Power over Ethernet - PD converter with 5 V 8 A output, synchronous Flyback, IEEE802.3bt standard compliant
      1.0
      1.34 MB
      PDF
      AN5207

      12 V/8 A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design

      AN5190

      5 V/20 A, active clamp forward converter, Power Over Ethernet (PoE) - IEEE 802.3bt compliant reference design

      AN5237

      High power Poe PD, 3V3 up to 20 A active clamp forward evaluation board

      AN5174

      Power over Ethernet - PD converter with 5 V 8 A output, synchronous Flyback, IEEE802.3bt standard compliant

Publications and Collaterals

    • Description Version Size Action
      Power Management Guide 06.2019
      4.89 MB
      PDF

      Power Management Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
PM8805TR
Active
QFN 8x8x1 43L P 0.5 6 Dice pad Industrial Ecopack2

PM8805TR

Package:

QFN 8x8x1 43L P 0.5 6 Dice pad

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFN 8x8x1 43L P 0.5 6 Dice pad

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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