LTC4261 datasheet(2/82 Pages) AD

2 / 82 page

LTC4284

Rev. B

For more information www.analog.com

TABLE OF CONTENTS

Resetting Faults......................................................39

Alarms ....................................................................39

EN# Pin...................................................................39

ON Bit .....................................................................39

Turning the LTC4284 On and Off ............................40

Configuring PGIO and ADIO Pins............................ 41

Design Examples .................................................... 41

Example 1: Design Procedure of Parallel Mode with

SOA Timer and Current Limit Startup..................... 41

Example 2: Design Procedure of Low Stress Staged

Start Mode with Single Capacitor on TMR Pin and

dV/dt Startup ..........................................................45

Layout Considerations............................................49

Reboot on I2C Command........................................49

Data Converters......................................................49

EEPROM .................................................................53

Fault Log.................................................................54

Digital Interface ......................................................55

Bus Compatibility....................................................55

START, REPEATED START and STOP Conditions ...56

ACK/NACK ..............................................................56

I2C Device Addressing ............................................56

Transfer Protocol Types..........................................56

Command Codes and Register Addressing.............58

Write Protocols.......................................................58

Read Protocols .......................................................58

Read Page and Write Page Protocols .....................58

Byte Ordering .........................................................58

ALERT# and Alert Response Protocol.....................58

Stuck Bus Reset .....................................................59

Data Synchronization and Arbitration.....................59

Single-Wire Broadcast............................................60

Package Description .....................................80

Revision History ..........................................81

Typical Application .......................................82

Related Parts ..............................................82

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 ................... 9

Pin Functions ..............................................12

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.................................................. 24

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

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

Overcurrent Fault and Auto-Retry...........................27

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

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

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

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

Dual-Gate Operation Modes....................................30

Parallel Mode (Mode 2) ..........................................30

High Stress Staged Start Mode (Mode 3)...............32

Low Stress Staged Start (Mode 4) .........................34

Single Driver Mode (Mode 1)..................................35

Overvoltage Fault and Auto-Retry...........................36

Undervoltage Fault and Auto-Retry.........................37

FET Short Fault.......................................................38

Power Failed Fault...................................................38

External Fault and Auto-Retry.................................38

Cooling Delay..........................................................38

LTC4261 Datasheet(PDF) 2 Page - Analog Devices

LTC4261 Datasheet(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 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

Datasheet Download

Link URL