LTM4675 datasheet(3/128 Pages) LINER

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LTC3884/LTC3884-1

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TABLE OF CONTENTS

Fault Indication .......................................................55

Open-Drain Pins .....................................................55

Phase-Locked Loop and Frequency

Synchronization .....................................................56

Minimum On-Time Considerations..........................56

External Temperature Sense...................................57

Input Current Sense Amplifier.................................58

External Resistor Configuration Pins (RCONFIG)....58

Voltage Selection................................................59

Frequency Selection ...........................................59

Phase Selection..................................................60

Address Selection Using RCONFIG.....................60

Efficiency Considerations .......................................61

Programmable Loop Compensation .......................62

Checking Transient Response.................................63

PolyPhase Configuration ....................................64

Master Slave Operation ......................................64

PC Board Layout Checklist .....................................67

PC Board Layout Debugging...................................67

Design Example......................................................68

Additional Design Checks .......................................69

Connecting the USB to I2C/SMBus/PMBus

Controller to the LTC3884 in System......................69

LTpowerPlay: An Interactive GUI for

Digital Power ..........................................................70

PMBus Communication and Command

Processing..............................................................70

PMBus Command Details ...............................73

Addressing and Write Protect.................................73

General Configuration Commands..........................75

On/Off/Margin ........................................................76

PWM Configuration ................................................78

Voltage....................................................................81

Input Voltage and Limits.....................................81

Output Voltage and Limits..................................82

Output Current and Limits ......................................85

Input Current and Limits ....................................87

Temperature............................................................88

External Temperature Calibration........................88

Timing ....................................................................89

Timing—On Sequence/Ramp.............................89

Timing—Off Sequence/Ramp ............................90

Precondition for Restart .....................................91

Fault Response .......................................................91

Fault Responses All Faults..................................91

Fault Responses Input Voltage ...........................92

Fault Responses Output Voltage.........................92

Fault Responses Output Current.........................95

Fault Responses IC Temperature ........................96

Fault Responses External Temperature...............97

Fault Sharing...........................................................98

Fault Sharing Propagation ..................................98

Fault Sharing Response.................................... 100

Scratchpad ........................................................... 100

Identification......................................................... 101

Fault Warning and Status...................................... 102

Telemetry.............................................................. 109

NVM Memory Commands .................................... 113

Store/Restore ................................................... 113

Fault Log Operation .......................................... 114

Fault Logging.................................................... 114

Block Memory Write/Read................................ 118

Typical Applications .................................... 119

Package Description ................................... 125

Revision History ........................................ 127

Typical Application ..................................... 128

Related Parts ............................................ 128

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