LTM4677 datasheet(3/116 Pages) AD

3 / 116 page

LTC3883/LTC3883-1

Rev. F

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TABLE OF CONTENTS

Topside MOSFET Driver Supply (CB, DB) ................47

Undervoltage Lockout.............................................47

CIN and COUT Selection ...........................................47

Fault Conditions......................................................48

Open-Drain Pins .....................................................49

Phase-Locked Loop and Frequency Synchronization..

Minimum On-Time Considerations..........................50

Input Current Sense Amplifier.................................50

RCONFIG (External Resistor

Configuration Pins)................................................. 51

Voltage Selection................................................ 51

Frequency and Phase Selection Using RCONFIG 53

Address Selection Using RCONFIG.....................53

Efficiency Considerations .......................................54

Checking Transient Response.................................54

PolyPhase Configuration ....................................55

PC Board Layout Checklist .....................................56

PC Board Layout Debugging...................................58

Design Example......................................................58

Connecting the USB to I2C/SMBus/PMBus Controller

to the LTC3883 In System ......................................60

Inductor DCR Auto Calibration ...............................61

Accurate DCR Temperature Compensation.............62

LTpowerPlay: An Interactive GUI for Digital Power .63

PMBus Communication and Command Processing64

PMBus Command Details ...............................66

Addressing and Write Protect.................................66

General Configuration COMMANDS........................67

On/Off/Margin ........................................................68

PWM Configuration ................................................70

Voltage....................................................................72

Input Voltage and Limits.....................................72

Output Voltage and Limits..................................73

Current....................................................................76

Output Current Calibration .................................76

Output Current....................................................78

Input Current Calibration ...................................80

Input Current ......................................................80

Temperature............................................................80

External Temperature Calibration........................80

External Temperature Limits...............................81

Timing ....................................................................82

Timing—On Sequence/Ramp.............................82

Timing—Off Sequence/Ramp ............................83

Precondition for Restart .....................................83

Fault Response .......................................................84

Fault Responses All Faults..................................84

Fault Responses Input Voltage ...........................84

Fault Responses Output Voltage.........................85

Fault Responses Output Current.........................87

Fault Responses IC Temperature ........................88

Fault Responses External Temperature...............89

Fault Sharing...........................................................90

Fault Sharing Propagation ..................................90

Fault Sharing Response......................................92

Scratchpad .............................................................92

Identification...........................................................92

Telemetry................................................................98

NVM Memory Commands .................................... 102

Store/Restore ................................................... 102

Fault Logging.................................................... 104

Block Memory Write/Read................................ 107

Typical Applications .................................... 109

Package Description ................................... 114

Revision History ........................................ 115

Typical Application ..................................... 116

Related Parts ............................................ 116

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