LTM4680 datasheet(3/132 Pages) AD

3 / 132 page

LTM4681

Rev. 0

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TABLE OF CONTENTS

Table 7. PMBus Commands Summary (Note: The Data

Format Abbreviations Are Detailed in Table 8)......... 50

Table 8. Data Format Abbreviations......................55

Applications Information ................................56

VIN to VOUT Step-Down Ratios................................56

Input Capacitors .....................................................56

Output Capacitors...................................................56

Light Load Current Operation .................................56

Switching Frequency and Phase .............................57

Output Current Limit Programming ........................58

Minimum On-Time Considerations..........................59

Variable Delay Time, Soft-Start and Output Voltage

Ramping .................................................................59

Digital Servo Mode .................................................59

Soft Off (Sequenced Off)........................................60

Undervoltage Lockout.............................................61

Fault Detection and Handling..................................61

Open-Drain Pins .....................................................61

Phase-Locked Loop and Frequency Synchronization .. 62

Input Current Sense Amplifier.................................63

Programmable Loop Compensation .......................63

Checking Transient Response.................................64

PolyPhase Configuration ......................................65

Connecting The USB to I2C/SMBus/PMBus

Controller to the LTM4681 In System.....................65

LTpowerPlay: An Interactive GUI for Digital Power .66

PMBus Communication and Command Processing66

Thermal Considerations and Output Current Derating. 68

Table 10 through Table 12: Output Current Derating.........71

Table 13. Single Channel Output Voltage vs

Capacitor Selection, 10A to 20A Load Step with

10A/µs Slew Rate ...............................................72

Table 14. Single Channel Output Voltage vs

Capacitor Selection, All Ceramic Configuration,

10A to 20A Load Step with 10A/µs Slew Rate ....73

Table 15. Dual Connected Channels Output Voltage

vs Capacitor Selection, Bulk and Ceramic Cap

Configuration, 10A to 30A Load Step with 20A/µs

Slew Rate ........................................................... 74

Table 16. Quad Connected Channels Output Voltage

vs Capacitor Selection, Bulk and Ceramic Cap

Configuration, 10A to 40A Load Step with 15A/µs

Slew Rate ........................................................... 74

Derating Curves......................................................75

EMI Performance....................................................77

Safety Considerations.............................................77

Layout Checklist/Example ......................................77

Typical Applications ......................................79

PMBus Command Details ...............................84

Addressing and Write Protect.................................84

General Configuration Commands..........................86

On/Off/Margin ........................................................87

PWM Configuration ................................................89

Voltage....................................................................92

Input Voltage and Limits.......................................92

Output Voltage and Limits ....................................93

Output Current and Limits ......................................96

Input Current and Limits.......................................98

Temperature............................................................99

Power Stage DCR Temperature Calibration...........99

Power Stage Temperature Limits..........................99

Timing .................................................................. 100

Timing—On Sequence/Ramp............................. 100

Timing—Off Sequence/Ramp ............................ 101

Precondition for Restart ..................................... 102

Fault Response ..................................................... 102

Fault Responses All Faults.................................. 102

Fault Responses Input Voltage ........................... 103

Fault Responses Output Voltage......................... 103

Fault Responses Output Current......................... 106

Fault Responses IC Temperature ........................ 107

Fault Responses External Temperature............... 108

Fault Sharing......................................................... 109

Fault Sharing Propagation .................................. 109

Fault Sharing Response.......................................111

Scratchpad ............................................................111

Identification......................................................... 112

Fault Warning and Status...................................... 113

Telemetry.............................................................. 119

NVM Memory Commands .................................... 123

Store/Restore ..................................................... 123

Fault Logging...................................................... 124

Block Memory Write/Read.................................. 128

Package Description ................................... 129

Table 25. LTM4681 BGA Pinout.......................... 129

Package Description ................................... 130

Package Photograph ................................... 132

Design Resources ...................................... 132

Related Parts ............................................ 132

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