Analog Devices LTM4683 Manual page 3

TABLE OF CONTENTS
Table 7. PMBus Commands Summary (NOTE: The
Data Format Abbreviations are Detailed in Table 8) . 49
Table 8. Data Format Abbreviations ......................54
Applications Information ................................ 55
V to V Step-Down Ratios ................................55
IN OUT
Input Capacitors .....................................................55
Output Capacitors ...................................................55
Light Load Current Operation .................................55
Switching Frequency and Phase .............................56
Output Current Limit Programming ........................ 57
Minimum On-Time Considerations..........................58
Variable Delay Time, Soft-Start and Output Voltage
Ramping .................................................................58
Digital Servo Mode .................................................58
Soft Off (Sequenced Off) ........................................ 59
Undervoltage Lockout .............................................60
Fault Detection and Handling ..................................60
Open-Drain Pins ..................................................... 61
Phase-Locked Loop and Frequency Synchronization .. 61
Input Current Sense Amplifier .................................62
Programmable Loop Compensation .......................62
Checking Transient Response .................................62
PolyPhase Configuration ......................................64
Connecting The USB to I
to the LTM4683 In System .....................................64
LTpowerPlay: An Interactive GUI for Digital Power .65
PMBus Communication and Command Processing 65
Thermal Considerations and Output Current Derating . 67
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 ........................................................... 75
EMI Performance .................................................... 76
Safety Considerations ............................................. 76
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C/SMBus/PMBus Controller
For more information
Layout Checklist/Example ...................................... 76
Typical Applications ...................................... 78
PMBus Command Details ............................... 83
Addressing and Write Protect .................................83
General Configuration Commands ..........................85
On/Off/Margin ........................................................86
PWM Configuration ................................................88
Voltage .................................................................... 91
Input Voltage and Limits ....................................... 91
Output Voltage and Limits ....................................92
Output Current and Limits ......................................95
Input Current and Limits ....................................... 97
Temperature ............................................................98
Power Stage DCR Temperature Calibration...........98
Power Stage Temperature Limits ..........................98
Timing ....................................................................99
Timing-On Sequence/Ramp ...............................99
Timing-Off Sequence/Ramp ............................ 100
Precondition for Restart ..................................... 101
Fault Response ..................................................... 101
Fault Responses All Faults .................................. 101
Fault Responses Input Voltage ........................... 102
Fault Responses Output Voltage ......................... 102
Fault Responses Output Current ......................... 105
Fault Responses IC Temperature ........................ 106
Fault Responses External Temperature ............... 107
Fault Sharing ......................................................... 108
Fault Sharing Propagation .................................. 108
Fault Sharing Response ...................................... 110
Scratchpad ........................................................... 110
Identification ..........................................................111
Fault Warning and Status ...................................... 112
Telemetry .............................................................. 118
NVM Memory Commands .................................... 122
Store/Restore ..................................................... 122
Fault Logging ...................................................... 123
Block Memory Write/Read .................................. 127
Package Description ................................... 128
Table 25. LTM4683 BGA Pinout .......................... 128
Package Description ................................... 129
Revision History ........................................ 131
Package Photos ......................................... 132
Design Resources ...................................... 132
Related Parts ............................................ 132
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