PD77728

 Data Sheet

© 2024 Microchip Technology Inc. and its subsidiaries

DS00003920E - 4

Table of Contents

Introduction...........................................................................................................................................................................1

Features..........................................................................................................................................................................2

Applications....................................................................................................................................................................3

1. Functional Descriptions................................................................................................................................................ 6

1.1. Analog Front-End Block..................................................................................................................................... 6

1.2. Voltage and Temperature Measurement Module......................................................................................... 6

1.3. Digital Processing and Control Block...............................................................................................................7

1.4. PoE Controller.................................................................................................................................................... 7

1.5. Power...................................................................................................................................................................7

1.6. Real-Time Protection (RTP)............................................................................................................................... 7

1.7. Over Supply Shutdown (OSS) .......................................................................................................................... 8

1.8. VMAIN Under-Voltage Lockout (VMAIN_UVLO) .....................................................................................................8

1.9. Surge....................................................................................................................................................................8

1.10. PSE System Modes of Operation .....................................................................................................................9

2. PD77020 PSE Power Management Controller.........................................................................................................10

3. Electrical Specifications.............................................................................................................................................. 11

3.1. Absolute Maximum Ratings............................................................................................................................11

3.2. Immunity...........................................................................................................................................................11

3.3. Recommended Operating Conditions...........................................................................................................12

3.4. Electrical Characteristics................................................................................................................................. 13

4. Pin Descriptions...........................................................................................................................................................17

5. Application Information............................................................................................................................................. 20

5.1. Operational Modes..........................................................................................................................................20

5.2. I2C.......................................................................................................................................................................24

5.3. 2-Pair and 4-Pair (2P/4P) Operation ............................................................................................................. 25

5.4. PD77728 Communication Interface.............................................................................................................. 25

5.5. OSS Pin Behavior............................................................................................................................................. 25

5.6. Compliance to Limited Power Source Requirements..................................................................................28

6. Package Specifications................................................................................................................................................29

6.1. Recommended PCB Layout............................................................................................................................ 31

6.2. Thermal Properties..........................................................................................................................................34

6.3. Recommended Solder Reflow Information.................................................................................................. 35

7. Tape and Reel Specifications..................................................................................................................................... 36

8. Ordering Information................................................................................................................................................. 38

9. Reference Documents................................................................................................................................................ 39

10.  Revision History...........................................................................................................................................................40

Microchip Information....................................................................................................................................................... 41

The Microchip Website............................................................................................................................................... 41

Product Change Notification Service........................................................................................................................ 41