ADM1275-2ARQZ-R7 datasheet(2/48 Pages) AD

2 / 48 page

ADM1275

Data Sheet

Rev. D | Page 2 of 48

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Applications Diagram ...................................................................... 1

General Description......................................................................... 1

Revision History ............................................................................... 3

Specifications..................................................................................... 4

Serial Bus Timing Characteristics.............................................. 7

Absolute Maximum Ratings............................................................ 8

Thermal Characteristics .............................................................. 8

ESD Caution.................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Typical Performance Characteristics ........................................... 14

Functional Block Diagrams........................................................... 20

Theory of Operation ...................................................................... 21

Powering the ADM1275............................................................ 21

Current Sense Inputs.................................................................. 21

Current Limit Reference............................................................ 22

Setting the Current Limit (ISET) ............................................. 22

Soft Start ...................................................................................... 23

Foldback....................................................................................... 23

Timer............................................................................................ 24

Hot-Swap Retry Duty Cycle...................................................... 24

FET Gate Drive Clamps............................................................. 24

Fast Response to Severe Overcurrent ...................................... 25

Undervoltage and Overvoltage................................................. 25

ENABLE Input (ADM1275-3 Only)........................................ 25

Power Good................................................................................. 25

VOUT Measurement ................................................................. 26

FET Health .................................................................................. 26

Power Monitor ............................................................................ 26

PMBus Interface ............................................................................. 27

Device Addressing...................................................................... 27

SMBus Protocol Usage............................................................... 27

Packet Error Checking............................................................... 27

Partial Transactions on I2C Bus................................................ 27

SMBus Message Formats........................................................... 28

Group Commands ..................................................................... 29

Hot-Swap Control Commands................................................. 30

ADM1275 Information Commands........................................ 30

Status Commands ...................................................................... 30

GPO and Alert Pin Setup Commands .................................... 31

Power Monitor Commands ...................................................... 31

Warning Limit Setup Commands............................................ 32

PMBus Direct Format Conversion .......................................... 32

Voltage and Current Conversion using LSB values ............... 33

ADM1275 Alert Pin Behavior ...................................................... 34

Faults and Warnings .................................................................. 34

Generating an Alert ................................................................... 34

Handling/Clearing an Alert...................................................... 34

SMBus Alert Response Address ............................................... 35

Example Use of SMBus Alert Response Address................... 35

PMBus Command Reference........................................................ 36

OPERATION .............................................................................. 37

CLEAR_FAULTS........................................................................ 37

CAPABILITY.............................................................................. 37

VOUT_OV_WARN_LIMIT..................................................... 37

VOUT_UV_WARN_LIMIT..................................................... 37

IOUT_OC_WARN_LIMIT ...................................................... 37

IOUT_WARN2_LIMIT............................................................. 38

VIN_OV_WARN_LIMIT......................................................... 38

VIN_UV_WARN_LIMIT......................................................... 38

STATUS_BYTE .......................................................................... 38

STATUS_WORD........................................................................ 39

STATUS_VOUT......................................................................... 39

STATUS_IOUT .......................................................................... 39

STATUS_INPUT........................................................................ 40

STATUS_MFR_SPECIFIC........................................................ 40

READ_VIN................................................................................. 40

READ_VOUT............................................................................. 41

READ_IOUT .............................................................................. 41

PMBUS_REVISION .................................................................. 41

ADM1275-2ARQZ-R7 数据表(PDF) 2 Page - Analog Devices

ADM1275-2ARQZ-R7 数据表(HTML) 2 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

数据表下载