LTC4261 datasheet(2/74 Pages) AD

2 / 74 page

LTC4283

Rev. B

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TABLE OF CONTENTS

EN# Pin...................................................................32

ON Bit .....................................................................32

Turning the LTC4283 On and Off ............................33

Configuring PGIO and ADIO Pins............................33

Design Examples ....................................................34

Example 1: Design Procedure for Systems with Large

Input Steps .............................................................34

Example 2: Design Procedure for Systems with

Regulated Inputs.....................................................38

Layout Considerations............................................ 41

Reboot on I2C Command........................................ 41

Data Converters......................................................42

EEPROM .................................................................45

Fault Log.................................................................46

Digital Interface ......................................................47

Bus Compatibility....................................................47

START, REPEATED START and STOP Conditions ...48

ACK/NACK ..............................................................48

I2C Device Addressing ............................................48

Transfer Protocol Types..........................................48

Command Codes and Register Addressing.............50

Write Protocols.......................................................50

Read Protocols .......................................................50

Read Page and Write Page Protocols .....................50

Byte Ordering .........................................................50

ALERT# and Alert Response Protocol.....................50

Stuck Bus Reset ..................................................... 51

Data Synchronization and Arbitration..................... 51

Single-Wire Broadcast............................................52

Package Description .....................................72

Revision History ..........................................73

Typical Application .......................................74

Related Parts ..............................................74

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

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

Typical Application ........................................ 1

Description.................................................. 1

Absolute Maximum Ratings.............................. 3

Order Information.......................................... 3

Pin Configuration .......................................... 3

Electrical Characteristics................................. 4

I2C Timing Diagram ....................................... 9

Typical Performance Characteristics ..................10

Pin Functions ..............................................13

Block Diagram.............................................16

Operation...................................................17

Applications Information ................................18

Input Power Supply ................................................ 18

Turn-On Sequence ..................................................20

Inrush Control.........................................................22

Power Good Monitors and PGI Fault.......................23

Turn-Off Sequence..................................................23

Overcurrent Protection ........................................... 24

SOA Timer .............................................................. 24

Overcurrent Fault and Auto-Retry...........................26

Current Limit Adjustment........................................27

Current Limit Foldback............................................27

FET Bad Fault and Auto-Retry.................................28

Input Step and Optimum Output Ramp...................29

Overvoltage Fault and Auto-Retry...........................29

Undervoltage Fault and Auto-Retry.........................30

FET Short Fault.......................................................31

Power Failed Fault...................................................31

External Fault and Auto-Retry.................................31

Cooling Delay..........................................................31

Resetting Faults......................................................32

Alarms ....................................................................32

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